CONTENT
CONTENT
1.
1.
INTRODUCTION
INTRODUCTION
3
3
2.
2.
SYSTEM
SYSTEM MODES
MODES
4
4
2.1
2.1 Connection Connection mode mode 44
2.1.1
2.1.1 Valid Valid measurements measurements 44
2.2
2.2 Power Power mode mode 55
2.3
2.3 Operating Operating energy energy quadrants quadrants 66
3.
3.
INSTRUMENTATION
INSTRUMENTATION
7
7
3.1 3.1 Measurements Measurements 77 3.1.1 3.1.1 Voltage Voltage 77 3.1.2 3.1.2 Current Current 77 3.1.33.1.3 Angles Angles between between Phases Phases 77 3.1.4
3.1.4 Frequency Frequency 77
3.1.5
3.1.5 Harmonics Harmonics 77
3.2
3.2 Power, Power, power power factor factor and and energy energy 88 3.2.1
3.2.1 Power Power 88
3.2.2
3.2.2 Power Power factor factor 88
3.2.3
3.2.3 Energy Energy 88
3.3
3.3 Demand Demand values values 99
3.3.1
3.3.1 Real Real time time clock clock 99
3.3.2
3.3.2 Maximum Maximum demands demands (MDs) (MDs) 99 3.3.3
3.3.3 Average Average demands demands 99
3.3.3.1
3.3.3.1 Fixed Fixed window window 99
3.3.3.2
3.3.3.2 Sliding Sliding window window 99
3.3.3.3
3.3.3.3 Thermal Thermal Demand Demand 99
3.4
3.4 Digital Digital Outputs Outputs 99
4.
4.
COMMUNICATIONS
COMMUNICATIONS
10
10
4.1 4.1 RS232 RS232 communications communications 1010 4.2 4.2 RS485 RS485 communications communications 10105.
5.
USER
USER INTERFACE
INTERFACE MENU
MENU STRUCTURE
STRUCTURE
11
11
5.1
5.1 Measurements Measurements menu menu 1212
5.1.1
5.1.1 Energy Energy meters meters menu menu 1313 5.2
5.2 Settings Settings 1414
5.2.1
5.2.1 Password Password menu menu 1515
5.2.2
5.2.2 Language Language menu menu 1616
5.2.3
5.2.4 Real time clock menu 17
5.2.5 Pulsed outputs menu 18
5.2.6 Reset MD Menu 18
5.2.6.1 Synchronisation 18
5.2.6.2 Reset MD since last reset 18
5.2.6.3 Reset MD for Present Period 19
5.2.7 Maximum demand calculations menu 20
5.2.8 Communication Menu 21 5.2.9 Connection menu 21 5.2.9.1 CT Ratio 22 5.2.9.2 Connection input 22 5.2.9.3 VT Ratio 22 5.3 Battery 23 5.3.1 Battery replacement 23 5.4 Default settings 23
6.
TECHNICAL DATA
24
6.1 Ratings 24 6.1.1 Voltage input 24 6.1.2 Current input 24 6.1.3 Frequency 24 6.1.4 AC auxiliary supply 24 6.1.5 DC auxiliary supply 24 6.2 Accuracy 25 6.3 Relay outputs 256.4 Real time clock 25
6.5 Back up battery 25 6.6 Communication ports 26 6.6.1 RS232 Port 26 6.6.2 RS485 Port 26 6.7 Product Safety 26 6.8 Environmental withstand 27 6.8.1 Atmospheric environment 27 6.8.2 Construction 27 6.9 CT and VT connections 27
6.10 Power supply, communications and pulsed output connections 30
1.
INTRODUCTION
The M231 Measurement Centre integrates a number of measurement, monitoring and metering functions in the same unit for comprehensive power system management. The use of numerical technology achieves high accuracy over a wide dynamic measuring range for instantaneous and integrated power system parameters. The M231 also provides a host of other measurement, monitoring and metering facilities as detailed below:
•
Instrumentation.−
Measured parameters as shown in Table 1.−
High accuracy, typically 0.5% for current and voltage.−
True RMS measurement.−
Display of primary quantities.•
Metering Facilities.−
Active and reactive energy metering.−
Demand metering.•
User friendly design.−
Large clear liquid crystal display.−
Programming from front panel and communications port.−
RS485 or RS232 Modbus protocol is available.The device is therefore ideally suited to applications where continuous monitoring of a single or three-phase system is required.
Instantaneous Measurements Parameters Phase voltages Ua, Ub, Uc
Average phase voltage U
Line voltages Uab, Ubc, Uca
Average line voltage U∆
Current Ia, Ib,Ic,It
Neutral current In
Active power Pa, Pb, Pc, Pt
Reactive power Qa, Qb, Qc, Qt
Apparent power Sa, Sb, Sc, St
Power factor cos
ϕ
a, cosϕ
b, cosϕ
c, cosϕ
tFrequency Frequency
Total Harmonic Distortion %THDIa, %THD Ib, %THDIc Total Harmonic Distortion %THD Ua, %THD Ub, %THD Uc Total Harmonic Distortion %THD Uab, %THD Ubc, %THD Uca Integrated/ Maximum Demands
Maximum demand It, Pt, Qt, St
Energy Wht, varht
2.
SYSTEM MODES
2.1 Connection mode
The connection mode of the M231 is menu-configurable. The following options are available:
•
1b - single phase connection,•
3b - three-phase, three-wire connection with balanced load,•
4b - three-phase, four-wire connection with balanced load,•
3u - three-phase, three-wire connection with unbalanced load•
4u - three-phase, four-wire connection with unbalanced load. 2.1.1 Valid measurementsTable 2 lists the valid measurements for each connection type.
Parameter Connection type
1b 3b 4b 4u 3u Ua
•
•
•
Ub•
•
Uc•
•
U•
•
•
•
Uab•
•
•
•
Ubc•
•
•
•
•
Uca•
•
•
•
U∆
•
•
•
•
I
a•
•
•
•
•
I
b•
•
•
•
I
c•
•
•
•
I
t•
•
•
•
•
I
n•
cosϕ
a•
•
•
cosϕ
b•
•
cosϕ
c•
•
cosϕ
t•
•
•
•
•
Pa•
•
•
Pb•
•
Pc•
•
Pt•
•
•
•
•
Qa•
•
•
Qb•
•
Qc•
•
Qt•
•
•
•
•
Parameter Connection type Sa
•
•
•
•
Sb•
•
Sc•
•
St•
•
•
•
•
%THD Ia•
•
•
•
•
%THD Ib•
•
•
•
%THD Ic•
•
•
•
%THD Ua•
•
•
%THD Ub•
•
%THD Uc•
•
%THD Uab•
•
•
•
%THD Ubc•
•
•
•
%THD Uca•
•
•
•
TABLE 2 : VALID MEASUREMENTS FOR EACH CONNECTION TYPE. 2.2 Power mode
The power mode is used for the signing of power measurements. The user cannot set the M231 power mode. It is defined as follows:
•
When displaying active power, a positive sign indicates export power (a consumer) whilst a negative sign indicates import power (a generator).•
When displaying reactive power, a coil symbol indicates an inductive load2.3 Operating energy quadrants
The operating energy quadrants are used to determine which types of energy are added to the energy counters. The user may modify the operating energy quadrants via the remote communications interface. The default operating energy quadrants are as follows:
•
Counter 1 – displays active energy: only export energy (a consumer) is measured.•
Counter 2 - displays reactive energy: only import reactive energy (a consumer) is measured.The four power quadrants are defined in Figure 1. The user may customise the energy meters to accumulate the desired values of energy to application specific requirements. Using the Modbus data register the user must enter the following information for each counter:
•
Energy type - active or reactive.•
Operating energy quadrants - select the required operating energy quadrants.•
Absolute Value - if this is chosen only the absolute value of energy recorded.•
Inverted value - if this is selected the polarity of the power used to accumulate the desired energy is reversed.S
S
S
S
P
P
P
Q Q Q QQua rant 2
Qua rant 1
Qua rant 3
Qua rant 4
Import Q
Import P
Import Q
Export P
Export Q
Export P
Export Q
Import P
Lagging vars to generator
Lagging vars to consumer
Power to consumer
Power to generator
Q (Cap)
Q (Ind)
P
--
P
+
3.
INSTRUMENTATION
3.1 Measurements
With the increase in harmonics present in today's power systems, due to the increased use of electronic loads such as computers, variable frequency drives, etc. it is important, when accurate monitoring of electrical parameters is required, to use a measuring technique that allows for their presence. Conventional measurement methods, that use a mean sensing technique, respond to the mean or average of the input waveform. This is only accurate when the input waveform approaches a pure sinusoid.
The M231 uses a true RMS (root-mean-square) measurement technique that provides accurate measurement with harmonics present up to the 15th harmonic. The M231 reads 64 samples per cycle and the true RMS measurement is obtained using these sampled values. 3.1.1 Voltage
All versions of the M231 except for the 3-phase 3-wire versions, measure the true RMS value of the phase voltages (Ua, Ub, Uc) connected to the unit. The three line voltages (Uab,
Ubc, Uca), average phase voltage (U) and average line voltage (U
∆
) are calculated fromthese measured parameters. For 3-phase 3-wire balanced systems, the M231 creates a virtual neutral internally.
The 3-phase 3-wire versions of the M231 measure the true RMS value of the phase to phase voltage.
The available phase, line and average voltages can be viewed on the M231 display or via the remote communications link.
3.1.2 Current
The M231 measures the true RMS value of the phase currents (Ia, Ib, Ic) connected to the unit. The neutral current (In), the average of all phase currents and the sum of all phase currents (It) are calculated from the three phase currents.
The available phase currents, average current and neutral current can be viewed on the M231 display or via the remote communications link whilst the sum of all phase currents is only available via the remote communications link.
3.1.3 Angles between Phases
Angles between phases indicate the angles between the vectors of phase voltages. A positive mark indicates correct phase sequence, while a negative mark indicates an opposite phase sequence of the measured system.
3.1.4 Frequency
The system frequency is calculated from the time period of the measured voltage and can be viewed from both the M231 display and the remote communications link.
3.1.5 Harmonics
The percentage total harmonic distortion (%THD) value is the ratio of the sum of the powers of the harmonic frequencies above the fundamental frequency to the power of the fundamental frequency. This sum of the powers is a geometric total, formed by taking the square root of the sum of the squares of the amplitude of each of the harmonics.
The M231 provides %THD values for each phase current, each phase voltage, and for the line voltages.
3.2 Power, power factor and energy 3.2.1 Power
The M231 provides accurate measurement of active (Pa, Pb, Pc, Pt), reactive (Qa, Qb, Qc,
Qt) and apparent power (Sa, Sb, Sc, St). For a four-wire system the powers are calculated
both for each phase separately and as a total. For a three-wire system only total power values are measured.
When displaying active power, a positive sign indicates export power (a consumer) whilst a negative sign indicates import power (a generator). When displaying reactive power, a coil symbol indicates an inductive load
(a consumer) whilst a capacitor symbol indicates a capacitive load (a generator).
All the available power parameters can be viewed using either the M231 display or via the remote communications link.
3.2.2 Power factor
The power factor is calculated as a quotient of active and apparent power for each phase separately (cos
ϕ
a, cosϕ
b, cosϕ
c) and as a total (cosϕ
t). A positive sign and a coil symbol denotes an inductive load (a consumer) whilst a negative sign and a capacitor symbol defines a capacitive load (a generator).All available power factor parameters can be read from the M231 display or via the remote communications link.
3.2.3 Energy
Four counters are available so that energy in each of the four quadrants can be measured. The configuration of the four counters can be adapted to the customer's needs via the remote serial communications link.
All four energy measurements may be viewed using either the M231 display or a remote communications link.
3.3 Demand values
The M231 provides maximum demand values from a variety of average demand values (fixed window, sliding window and thermal) for the following electrical parameters:
•
Total active power (Pt).•
Total reactive power (Qt).•
Total apparent power (St).•
Sum of phase currents (It).3.3.1 Real time clock
The M231 is provided with a built-in real time clock. It is intended for registration of time of the occurrence of Maximum demands, and for synchronisation of the time interval.
3.3.2 Maximum demands (MDs)
The M231 stores the maximum demand value since last reset and its corresponding time stamp. The unit also displays the present or 'dynamic' maximum demand.
3.3.3 Average demands 3.3.3.1 Fixed window
The fixed interval method calculates an average demand value over a fixed time period. The period can be set over the range 1 to 255 minutes.
3.3.3.2 Sliding window
The sliding window technique allows the user to divide the time period into a number of sub-periods. The average demand value over the demand period is displayed, however, after the initial demand period has elapsed, the demand value will be updated by the addition of a further sub-period, thus creating a 'sliding window' measurement. For example if the total period is 30 minutes (consisting of 5 periods of 6 minutes duration), after the first 5 sub-periods have elapsed a new window will be added and the oldest window will be deleted, thus creating a sliding window. The number of sub-periods may be set between 2 to 15. 3.3.3.3 Thermal Demand
The thermal demand option will provide an exponential thermal characteristic, based on the bimetal element principal. Maximum demand and the time of its occurrence are stored in the unit.
3.4 Digital Outputs
The M231 can be supplied with two pulsed outputs that can be used for external monitoring of energy consumption. The energy measuring via the pulsed outputs corresponds to the basic energy measurement on the M231 display. The pulsed outputs' energy measurement can be adapted to the customers needs via the remote communications link.
4.
COMMUNICATIONS
The M231 is supplied with either RS232 or RS485 electrically isolated communications and should be specified at ordering. The communications protocol is MODBUS RTU, which is detailed in the Appendix of this Service Manual. The communications service enables remote viewing of measurements and viewing and setting of system parameters.
4.1 RS232 communications
The connection of RS232 communications between the M231 and a PC is detailed in Table 3. The maximum connection length is 15 metres.
M231 terminal 9 pin D connector (PC) 25 pin D connector (PC)
Rx(19) Tx (3) Tx(2)
GND (20) GND (5) GND(7)
Tx(21) Rx (2) Rx(3)
TABLE 3 : RS232 CONNECTIONS 4.2 RS485 communications
RS485 communications enables simultaneous connection to a maximum of 32 communicating devices. Two-wire RS485 only is used. For RS485 communications, the PC will require either an internal RS485 communications port or an external RS232/RS485 interface. In both cases the device must provide automatic RS485 data flow control. The maximum connection length is 1000 metres. Conductors Data+ and Data- should be terminated with a 120
Ω
terminating resistor on the last unit in the RS485 link. Table 4 details the RS485 connections. M231 terminal RS485 19 DATA + 20 shield 21 DATA -TABLE 4 : RS485 CONNECTIONS5.
USER INTERFACE MENU STRUCTURE
The settings, measurements and functions of the M231 can be accessed from either the front panel or the remote communications link.
The menu structure of the M231 is navigated using the four keys on the front panel. Throughout this section the arrows in the diagrams relate to pressing the corresponding key on the front panel.
The M231 has four levels of access:
•
L0 - No password is required. This allows the user to browse through the measurements and the set display.•
L1 - Level 1 password required. In addition to the access rights of L0, the following are available; set the real time clock, reset and synchronise maximum demand and reset the energy meters.•
L2 - Level 2 password required. In addition to the rights of L0 and L1 the following are available; setting of pulsed outputs, demand calculations, communications settings and connection modes.•
L3 - Level 3 password required. This level is accessible only via the remote communications interface and is used for factory calibration and service.The M231 is supplied with both L1 and L2 passwords set to AAAA. AAAA passwords offer no level of protection; all measurements and settings can be modified. The L1 and L2 passwords must be changed from AAAA to activate password level protection.
When the M231 is first connected to the power system the user is greeted with the message shown in Figure 2.
Measurement Centre M231
FIGURE 2 : GREETING
After a period of five seconds the M231 display automatically defaults to display the energy meters as shown in Figure 3.
1 EXPORT kWh
0000000.00
2 IMPORT kvarh
0000000.00
5.1 Measurements menu
Figure 4 illustrates the measurements menu structure. The user can browse through the available measurements without entering any password. The user will automatically be prompted to enter a password where required to modify settings or reset measurements.
10 EXPORT kWh 0000000.00 20 IMPORT kvarh 0000000.00 09:APR:2004 07:12:34 1 * RESET 2 * RESET 3 * RESET 4 * RESET PF TOTAL +0.003ß FREQUENCY 00.00Hz +0.003 ß PHASE a +0.003 ß PHASE b +0.003ß PHASE c 000.00 W+ TOTAL 000.00 VAR TOTAL 000.00 VA TOTAL 000.00 W+ PHASE a 000.00 W+ P HASE b 000.00 W+ P HASE c 000.00 VAR PHASE a 000.00 VAR P HASE b 000.00 VAR PHASE c 000.00 VA P HASE a 000.00 VA P HASE b 000.00 VA P HASE c 000.0 V LINE a -b 000.0 V LINE b -c 000.0 V LINE c - a AVERAGE 000.00 V 000.0 V PHASE a 000.0 V PHASE b 000.0 V PHASE c AVERAGE 000.00 V 000.5 6% THD U PHASE a 000.56% THD U PHASE b 000.56% THD U PHASE c 0000.0 mA PHASE a 0000.0 mA PHASE b 0000.0 mA PHASE c NEUTRAL 0.000 A AVERAGE 0000.0 mA PRESENT MD Pt= +00.00 W MD at 05.APR 08:12 Pt= +000.0 W PRESENT MD It= +00.00 mA MD at 05.APR 08:12 It= +000.0 mA PRESENT MD Qt= +00.00 var MD at 05.APR 08:12 Qt= +000.0 var PRESENT MD St= +00.00 VA MD at 05.APR 08:12 St= +000.0 VA 30 IMPORT kWh 0000000.00 40 EXPORT kvarh 0000000.00 SETTING -041.56˚ a-b -001.56˚ c-a +046.31˚ b-c 000.56% THD U LINE a -b 000.56% THD U LINE b-c 000.56% THD U LINE c-a 000.56% THD I PHASE a 000.56% THD I PHASE b 000.56% THD I PHASE c
5.1.1 Energy meters menu
A level 1 or 2 password must be entered to gain access to reset the energy meters shown in Figure 5. The user can either reset any of the four energy counters separately, or reset energy counters 1 to 4 simultaneously. To reset the chosen counter the
→
key must be held for five seconds.30 IMPORT kWh 0000000.00 40 EXPORT kvarh 0000000.00 1 * RESET * 2 * RESET * 3 * RESET * 4 * RESET * 1 * RESET * 5 2 * RESET * 5 3 * RESET * 5 4 * RESET * 5 4 * RESET * 4 * RESET * 5 3 * RESET * 3 * RESET * 5 2 * RESET * 2 * RESET * 5 1 * RESET * 1 * RESET * 5
5.2 Settings
Figure 6 illustrates the main setting menu.
SETTIN PASSWOR
DISPLA
LOCK
PULSE OUTPU
RESET MD
DEMAND CALCULA IONS
OMMUNICA ION
CONNECTION LANGUAGE
5.2.1 Password menu
Figure 7 illustrates the password menu. The user may; enter the desired level of password, cancel the current password, set level 1 password or set level 2 password. A password consists of four letters from A to Z. The
←
and→
keys are used to select each character in turn, whilst the↑
and↓
keys scroll through the available characters. To enter the password press the→
key after the last character has been modified.The M231 monitors the level of entered password. If no key is pressed for 15 minutes, the password is automatically cancelled.
Each level's password is the same both via the front panel and the remote communications interface. The factory-set default for level 1 and level 2 is AAAA. On receipt of the unit both levels of password should be modified to invoke password protection.
PASSWORD ENTER PASSWORD:
SET L2 PASSWORD: SET L1 PASSWORD: ENTER PASSWORD: A * * * ENTER PASSWORD: A * * * ENTER PASSWORD: A * * * CANCEL PASSWORD:
5.2.2 Language menu
Figure 8 illustrates the language menu. A level 2 password must be entered to change the language. The
↑
and↓
keys are used to select the required language.LANGUAGE LANGUAGE ENGLISH LANGUAGE:
ENGLISH SET LANGUAGE: PYCCKUN SET LANGUAGE: SLOVENSKI SET LANGUAGE: ESPAÑOL SET LANGUAGE: DEUTSCH SET LANGUAGE: FRANCAIS SET * * RUSSIAN
5.2.3 Display menu
Figure 9 illustrates the display menu. The display settings can be modified from level 0. The desired character is chosen with the
←
and→
keys and its value selected with the↑
and↓
keys.
The display's contrast may be set from 0 to 63, the backlight from 0 to 255 and the off time from 0 to 54 minutes. Display illumination is switched on with the press of any key and off after the set time from the last key pressed.
DISPLA CONTRAST: 20
TIME OFF: 05min
BACK LIGHT: 255
CONTRAST: 20 SET
TIME OFF: 05min SET
BACK LIGHT: 255 SET
FIGURE 9 : DISPLAY MENU 5.2.4 Real time clock menu
Figure 10 illustrates the real time clock menu. The real time clock can be set with level 1 or level 2 access. For time and date settings the character is chosen with the
←
and→
keys and set with the↑
and↓
keys. When setting the year, just the↑
and↓
keys are used.CLOCK TIME: 18:05 YEAR: 1999 DATE: 11.MAY TIME: 18:05 SET SET SET YEAR: 1999 DA E: 11.MAY
5.2.5 Pulsed outputs menu
A level 2 password must be entered to set the pulsed outputs as illustrated in Figure 11. The
↑
and↓
keys are used to select the required pulse rate.The number of pulses may be set from 20P/MWh to 1P/Wh for the real energy meter output and from 20P/Mvarh to 1P/varh for the reactive energy meter output.
The pulsed outputs are derived from the displayed energy meters and their resolution will be affected by changes in the VT and CT ratios.
PULSE OUTPUT OUT1: 100P/kWh
OUT2: 100P/kvarh
OUT1: 100P/kWh SET
SET
OUT2: 100P/kvarh
FIGURE 11 : PULSED OUTPUTS MENU 5.2.6 Reset MD Menu
A level 1 or 2 password is required to reset or synchronise the MD quantities as illustrated in Figure 12. To synchronise MD, reset MD since last reset or reset MD for present period, the
→
key must be pressed for a period of five seconds. 5.2.6.1 SynchronisationThe synchronisation command operates differently depending on the selected mode of MD calculation:
•
Thermal mode - synchronisation has no effect.•
Fixed window - at the moment of synchronisation, calculation of the dynamic MD is halted and considered for storage as the MD since reset. Calculation of MD is resumed at the beginning of the next full minute.•
Sliding window - at the moment of synchronisation, calculation of the dynamic MD for the present sub-period is halted and considered for storage as the MD for the entire window. Calculation of MD is continued at the beginning of the next full minute of the following sub-window.5.2.6.2 Reset MD since last reset
When resetting MD since last reset the operation is performed differently depending on the selected mode of MD calculation:
•
Thermal mode - present MD and MD since last reset are reset.•
Fixed window - MD of the window is reset and MD since last reset is reset. At the same time, synchronisation of the time interval is performed.•
Sliding window - MD of present sub-window, all other sub-windows and MD since last reset are reset. At the same time, synchronisation of the time interval is performed at the beginning of the first sub-window.5.2.6.3 Reset MD for Present Period
When resetting MD for the present period the operation is performed differently depending on the selected mode of MD calculation:
•
Thermal mode - MD for present period is reset.•
Fixed window - MD for present period is reset. At the same time, synchronisation of the time interval is performed.•
Sliding window - MD for present sub-window and all other sub-windows in the time interval are reset. At the same time, synchronisation of the time interval is performed at the beginning of the first time interval.RESET MD SYNCHRONISE SYNCHRONISE 5
MD SINCE RESET D SINCE RESET 5
PRESENT PERIOD PRESENT PERIOD 5
5.2.7 Maximum demand calculations menu
A level 2 password must be entered to set maximum demand calculations as illustrated in Figure 12. The following parameters may be set:
•
Thermal mode.•
Fixed window - the time interval can be set between 1 to 255 minutes.•
Sliding window - the time interval can be set between 1 to 255 minutes and the number of sub-windows between 2 to 15.If the time interval is set to 0, the calculation of MD is switched off.
DEMAND CALCULATIONS MD MODE: FIXED INTERVAL MD MODE: FIXED INTERVAL SET Time C.= 00 m in . MD MODE: THERMAL DEMAND SET MD MODE: 1S SUD.WINDOW SET MD MODE: 2 SLID.WINDOW SET Time C.= 0 0 m in . SET
5.2.8
5.2.8 Communication Communication MenuMenu
A level 2 password is required to set the communications parameters illustrated in Figure 13. A level 2 password is required to set the communications parameters illustrated in Figure 13.
••
Communications rate - the communications transmission rate is selected with theCommunications rate - the communications transmission rate is selected with the↑
↑
andand
↓
↓
keys. The selectable rate values are 1200, 2400, 4800, 9600, 19200, andkeys. The selectable rate values are 1200, 2400, 4800, 9600, 19200, and (optionally) 38400, 57600 and 115200.(optionally) 38400, 57600 and 115200.
••
Address - the communications address can be set in the range of 1 to 247. Address 0Address - the communications address can be set in the range of 1 to 247. Address 0 is reserved for broadcast messaging.is reserved for broadcast messaging.
••
Communications data form - the length, parity and stop bit can be set for the dataCommunications data form - the length, parity and stop bit can be set for the data form. The data form can be set as follows:form. The data form can be set as follows: Length:
Length: 7,8 7,8 (value (value 8 8 is is always always used used for for MODBUS MODBUS RTU)RTU) Parity:
Parity: n n (none), (none), o o (odd) (odd) and and e e (even)(even) Stop
Stop bit: bit: 1 1 or or 22
COMMUNICATION
COMMUNICATION RS BitRATE: 19200RS BitRATE: 19200
RS ADDRESS = 033 RS ADDRESS = 033 RS FRAME: 8, N, 2 RS FRAME: 8, N, 2 SET SET SET SET SET SET RS BitRATE: 19200 RS BitRATE: 19200 RS ADDRESS = 033 RS ADDRESS = 033 RS RS FRFR MEME: 8, : 8, NN, 2, 2
FIGURE 14 : COMMUNICATION MENU FIGURE 14 : COMMUNICATION MENU 5.2.9
5.2.9 Connection Connection menumenu
A level 2 password is required to set the connection menu as illustrated in Figure 15. A level 2 password is required to set the connection menu as illustrated in Figure 15.
CONNECTION CONNECTION CT = 00030/5CT = 00030/5 INPUT: 1b INPUT: 1b VT = 0230.0 /230 VT = 0230.0 /230 SET SET SET SET SET SET CT = 00030/5 CT = 00030/5 INPUT: 1b INPUT: 1b VT = 0230.0 /230 VT = 0230.0 /230
FIGURE 15 : CONNECTION MENU FIGURE 15 : CONNECTION MENU
5.2.9.1
5.2.9.1 CT RatioCT Ratio
When setting the current ratio only the primary value may be altered; the secondary value When setting the current ratio only the primary value may be altered; the secondary value (1A or 5A) must be specified with the order. Selectable ratios are defined in Table 5. When (1A or 5A) must be specified with the order. Selectable ratios are defined in Table 5. When 'set' is displayed, the character is selected by pressing the
'set' is displayed, the character is selected by pressing the
←
←
andand→
→
keys and the valuekeys and the value modified by using themodified by using the
↑
↑
andand↓
↓
keys. When the desired ratio has been selected thekeys. When the desired ratio has been selected the→
→
keykey should be pressed until 'set' disappears.should be pressed until 'set' disappears. Ratio
Ratio Ratio Ratio Step Step 1A 1A CT CT 5A CT5A CT
1...63 1 1...63 1 1...63 1...63 5...3155...315 65...315 65...315 5 5 65...315 65...315 325...1575325...1575 320...630 320...630 10 10 320...630 320...630 1600...3151600...31500 650...3150 650...3150 50 50 650...3150 650...3150 3250...157503250...15750 4000 - 4000 - 4000 4000 2000020000 TABLE 5 : CT RATIOS TABLE 5 : CT RATIOS 5.2.9.2
5.2.9.2 Connection inputConnection input
The type of connection to the power system must be set to match the physical connection The type of connection to the power system must be set to match the physical connection implemented. The connection type is selected with the
implemented. The connection type is selected with the
↑
↑
andand↓
↓
keys. Connection types arekeys. Connection types are as follows:as follows:
••
1b - single phase connection,1b - single phase connection,••
3b - three-phase, three-wire connection with balanced load,3b - three-phase, three-wire connection with balanced load,••
4b - three-phase, four-wire connection with balanced load,4b - three-phase, four-wire connection with balanced load,••
3u - three-phase, three-wire connection with unbalanced load3u - three-phase, three-wire connection with unbalanced load••
4u - three-phase, four-wire connection with unbalanced load.4u - three-phase, four-wire connection with unbalanced load. 5.2.9.35.2.9.3 VT RatioVT Ratio
Both the primary and secondary values of the VT ratio may be set. The values are set in the Both the primary and secondary values of the VT ratio may be set. The values are set in the same manner as described for the CT ratio. When setting the voltage transformer primary same manner as described for the CT ratio. When setting the voltage transformer primary value, the decimal point is also set. The decimal point is set with the
value, the decimal point is also set. The decimal point is set with the
↑
↑
andand↓
↓
key when thekey when the decimal point is selected (underlined). By setting the decimal point, the resolution of the decimal point is selected (underlined). By setting the decimal point, the resolution of the energy display can be changed.energy display can be changed. Voltage
Voltage Range Range Voltage Voltage StepStep 10
10 ... ... 137 137 V V 1 1 VV 140
140 ... ... 775 775 V V 5 5 VV
TABLE 6 : SECONDARY VOLTAGE SETTINGS TABLE 6 : SECONDARY VOLTAGE SETTINGS Voltage
Voltage Range Range Voltage Voltage StepStep 0.1 0.1 ... ... 1599.9 1599.9 V V 0.1 0.1 VV 1 1 ... ... 15.999 15.999 kV kV 1 1 VV 10 10 ... ... 159.99 159.99 kV kV 10 10 VV 100 100 ... ... 1599.9 1599.9 kV kV 100 100 VV
TABLE 7 : PRIMARY VOLTAGE SETTINGS TABLE 7 : PRIMARY VOLTAGE SETTINGS
5.3 Battery 5.3 Battery
The M241 is supplied with a lithium battery that is used to
The M241 is supplied with a lithium battery that is used to store setting and data in the eventstore setting and data in the event of a
of a auxuiliary supply failure. This battery should last 6 auxuiliary supply failure. This battery should last 6 years in normal years in normal operation operation althoughalthough high temperature and humidity will shorten this time.
high temperature and humidity will shorten this time. 5.3.1
5.3.1 Battery Battery replacemreplacementent
When the battery is due to be replaced or when there has been a loss of auxiliary supply, the When the battery is due to be replaced or when there has been a loss of auxiliary supply, the battery status indica
battery status indicator on the tor on the bottom right hand part of bottom right hand part of the front menu will flash. the front menu will flash. The M241The M241 will remain in operation but if the battery is not replaced then the real time clock and the will remain in operation but if the battery is not replaced then the real time clock and the maximum demand measurement data will be lost in the event of a loss of the auxiliary maximum demand measurement data will be lost in the event of a loss of the auxiliary supply.
supply.
FIGURE 16 : BATTERY STATUS INDICATOR FIGURE 16 : BATTERY STATUS INDICATOR
The battery can be replaced by taking the M241 out of the panel and removing the rubber The battery can be replaced by taking the M241 out of the panel and removing the rubber cover on the
cover on the rear of the rear of the case. case. NOTE that removing the NOTE that removing the battery will erase all the battery will erase all the maximummaximum demand data values.
demand data values.
FIGURE 17 : BATTERY REPLACEMENT FIGURE 17 : BATTERY REPLACEMENT 5.4
5.4 Default Default settingssettings
The M231 is supplied with the following default settings. Changes to these settings to
The M231 is supplied with the following default settings. Changes to these settings to can becan be made on the front menu or via remote communications.
made on the front menu or via remote communications. Counters
Counters and and registers registers Set Set at at zerozero Password
Password None None setset
Language English
Language English
Display
Display Contrast Contrast 20, 20, Time Time off off 5 5 min, min, Backlight Backlight 255255 Clock
Clock Time Time Zone Zone CET, CET, Current Current year year and and datedate Demand
Demand CalculatioCalculation n MD MD Mode: Mode: Thermal Thermal Demand, Demand, time time constant constant 15 15 minmin Communication
Communication 9600bps, 9600bps, address: address: 33, 33, RS RS frame frame :8,n,1:8,n,1 Connection Connection VT VT 230.0/230 230.0/230 or or 57.0/57 57.0/57 or or 63.5/63.563.5/63.5 CT 5/5 or 1/1 CT 5/5 or 1/1 Mode: Mode: 4u 4u (3W4)(3W4)
6.
TECHNICAL DATA
6.1 Ratings 6.1.1 Voltage input
Nominal voltage (Un) 63.5V, 120V and 230V phase to neutral
Measuring range 10 to 150% Un
Burden <0.1VA
Thermal withstand 1.5Uncontinuously 2Unfor 1s
6.1.2 Current input
Nominal current (In) 1A or 5A Measuring range 0 to 160% In
Burden <0.1VA
Thermal withstand 3In continuously 25In for 3s 50In for 1s 6.1.3 Frequency Nominal frequency (fn) 50Hz or 60Hz Measuring range 45Hz to 65Hz 6.1.4 AC auxiliary supply
Nominal voltage (Ux) 63.5V, 120V and 230V
Operative range 80 to 120% Ux
Thermal withstand 1.2Uxcontinuously
1.5Uxfor 10s
Nominal frequency (fx) 50Hz or 60Hz
Operative frequency range 45Hz to 65Hz
Burden <5VA
6.1.5 DC auxiliary supply
Nominal voltage (Ux) 24V to 220V
Operative range 19V to 300V
6.2 Accuracy Measurement Voltage ±0.5% Un** Phase current ±0.5%In* Neutral current ±1% of 3 xIn* Power ±0.5% * Power factor ±0.005 MD values ±1% * Frequency ±0.01 Hz
Active energy IEC 61036 Class 1.0 Reactive energy IEC 61268 Class 2.0
THD ±1%***
* For these values the accuracy is % of nominal for 0 ... 100% of nominal and % of reading above nominal.
** For voltage the accuracy is % of nominal for 10...100% of nominal and % of reading above nominal. For voltage range 0...10% Un the max. error is 2% of nominal value. *** Measured input (voltage, current) must be greater than 10% of the nominal. Measuring
range 0 …400% 6.3 Relay outputs
Maximum AC switching power 50VA
Maximum switching voltage 350V DC or peak AC Maximum switching current 1A
Isolation Coil to contacts 4000 V rms 5600 V DC Across contacts 1400 V rms
2000 V DC Maximum pulses per hour 4000
Pulse duration 100ms 6.4 Real time clock
Accuracy ±1 minute/month (30 ppm) 6.5 Back up battery
6.6 Communication ports 6.6.1 RS232 Port
Connection type Point to point
Signal levels RS232
Cable type Screened multi-core Maximum cable length 15m
Connector Screw terminals
Isolation 3.7kV rms for 1 minute between all terminals and all other circuits
Transmission mode Asynchronous Message format MODBUS RTU
Data rate 1200 to 115200 bits/s 6.6.2 RS485 Port
Connection type Multi-drop (32 connections per link)
Signal levels RS485
Cable type Screened twisted pair Maximum cable length 1000m
Connector Screw terminals
Isolation 3.7kV rms for 1 minute between all terminals and other circuits
Transmission mode Asynchronous Message format MODBUS RTU
Data rate 1200 to 115200 bits/s 6.7 Product Safety
EN61010-1:1990 Auxiliary supply AC 600V, Installation category III Auxiliary supply AC/DC 300V, Installation cat. III Pollution degree 2
Test voltage 3.7kV r.m.s according to EN61010-1:1990 EMC compliance
89/336/EEC Compliance with European Commission Directive on EMC, is claimed via the technical construction file route. The following generic standards were used to establish conformity.
EN 62052-11:2003 Electricity metering equipment (ac), General requirements, tests and test conditions Part 11: Metering equipment
EN 62053-21:2003 Particular requirements:
Part 21: Static meters for active energy (classes 1 and 2) EN 62053-23:2003 Particular requirements:
Part 23: Static meters for reactive energy (classes 2 and 3)
Product Safety
73/23/EEC Compliance with European Commission Low Voltage Directive
EN61010-1:2002 Safety requirements for electrical equipment for measurement, control and laboratory use. Part 1: General requirements
6.8 Environmental withstand 6.8.1 Atmospheric environment
Temperature and humidity
JVF (DIN 40 040) Reference range of operation 0°C to 50°C Nominal range of operation -10°C to 65°C Storage and transit -25°C to 70°C Annual relative mean humidity • 75% r.h Enclosure protection IEC 50529: 1989 IP 52 6.8.2 Construction
Case Polycarbonate. Compliance with UL 94 V0
Dimensions 96x96x108 mm
Weight 0.6kg
6.9 CT and VT connections
FIGURE 19 : EXTERNAL WIRING DIAGRAM: 3-PHASE, 3-WIRE BALANCED LOAD (3B)
FIGURE 21 : EXTERNAL WIRING DIAGRAM: 3-PHASE, 3-WIRE UNBALANCED LOAD (3U)
6.10 Power supply, communications and pulsed output connections CT1 CT2 CT3 15 16 17 18 19 20 21 11 2 5 8 13 148
13 +/~ auxiliary supply
14 -/~ auxiliary supply
15, 16 Output 1
17, 18 Output 2
19 Rx/DATA+
20 GND/shield
21 Tx/DATA
-FIGURE 23 : POWER SUPPLY, COMMUNICATIONS & PULSED OUTPUT CONNECTIONS
100ms Out R>100R Pulse receptor 24V DC 0 Power supply
6.11 Dimensions
FIGURE 25 : M231 DIMENSIONS
CONTENT
1.
INTRODUCTION
3
2.
TRANSACTIONS
4
2.1 Request 4
2.2 Response 4
2.3 Request - response cycle example 4
2.3.1 Request Frame 5
2.3.2 Response Frame 5
3.
FRAMING
6
3.1 RTU framing 6
4.
SUPPORTED FUNCTIONS AND USAGE
7
4.1 03 read from holding registers 7
4.1.1 Request Frame 7
4.1.2 Response Frame 7
4.2 04 read from input registers 8
4.2.1 Request Frame 8
4.2.2 Response Frame 8
4.3 06 write to a single holding register 8
4.3.1 Request Frame 8
4.3.2 Response Frame 9
4.4 16 (10 HEX) write to one or more registers 9
4.4.1 Request Frame 9
4.4.2 Response Frame 9
4.5 17 (11HEX) report slave id 10
4.5.1 Request Frame 10
4.5.2 Response Frame 10
4.6 77 (4D HEX) read measurement string 10
4.6.1 Request Frame 10
4.6.2 Response Frame 10
4.6.3 Value Codes 11
4.7 82 (52 HEX) re-read output buffer 13
4.7.1 Request Frame 13
4.7.2 Response Frame 13
5.
ERROR RESPONSES
14
5.1 Exception codes 14
7.
MODBUS DATA TYPES
27
8.
CRC CHECKING AND GENERATING
28
8.1 Generating a CRC 28
8.2 Placing the CRC into the message 29
8.3 CRC generation function 29
8.4 High order byte table 30
8.5 Low order byte table 31
1.
INTRODUCTION
The M231 implements a subset of the Modicon Modbus RTU serial communications standard [reference 1, Modicon Modbus Protocol Reference Guide PI - MBUS - 300 Rev. E]. Modbus is a single master multiple slave protocol suitable for a multi-drop configuration as provided by the RS485 connection. Up to 32 devices can be connected in this way. Single -drop RS232 connection is also possible.
2.
TRANSACTIONS
Communication operates on a master-slave basis where only one device (the master) can initiate transactions called 'Requests'. The other devices (slaves) respond by supplying the requested data to the master. This is called the 'Request - Response Cycle'.
Master to slave request:
Device address Function Code nx8 bit data bytes Error check Slave to master response:
Device address Function Code nx8 bit data bytes Error check
2.1 Request
This Master to Slave transaction takes the form: Device address:
Master addressing a slave (Address 0 is used for the broadcast address, which all slave devices recognise.)
Function code:
E.g. 04 asks the slave to read its Input Registers and respond with their contents.
Data bytes:
Tells the slave which register to start at and how many registers to read. 2.2 Response
This Slave to Master transaction takes the form: Device address:
To let the master know which slave is responding. Function code:
This is an echo of the request function code. Data bytes:
Contains the data collected from the slave. 2.3 Request - response cycle example
Ia 160.00 A = 16000* 10-2A Data type “T3” 32 bit unsigned FE 00 3E 80(16)
Data held in Modbus addresses 30036(10) & 30037(10)
2.3.1 Request Frame
Starting Register Register Count CRC Slave Address HI LO Function code HI LO LO HI 21 04 00 24 00 02 2.3.2 Response Frame Register Data CRC Slave Address
LO HI Function code Byte Count HI LO HI LO
3.
FRAMING
There are two types of message framing for the serial communications, ASCII or RTU. The M231 supports RTU framing.
3.1 RTU framing
In RTU mode, messages start and end with a silent interval of at least 3.5 character times (t1-t2-t3-t4 as shown below).
The advantage of this mode of framing is that it enables a greater character density and a better data throughput. However, each message must be transmitted in a continuous stream. If a silent interval of more than 1.5 character times occurs before completion of the frame, the device flushes the incomplete message and assumes that the next byte will be the address field of a new message.
Start Address Function Data CRC Check End t1-t2-t3-t4 8 bits 8 bits n x 8 bits 16 bits t1-t2-t3-t4 The Cyclic Redundancy Check (CRC) field is two bytes, containing a 16 bit binary value. The CRC value is calculated by the transmitting device, which appends the CRC to the message. The receiving device recalculates a CRC during receipt of the message, and compares the calculated value to the actual value it received in the CRC field. If the two values are not equal an error results. The CRC-16 calculation is an industry standard method used for error detection.
One frame is transmitted as 1 start bit, 8 data bits and 2 stop bit. If parity is selected then the frame is transmitted as 1 start bit, 8 data bits, and 1 stop bit.
Where n > 1 data is transmitted most significant byte first. The CRC check is transmitted least significant byte first.
4.
SUPPORTED FUNCTIONS AND USAGE
Code Code Function References
DEC HEX
3 03 to read from holding registers (4XXXX memory references) 4 04 to read from input registers (3XXXX memory references) 6 06 to write to a single holding register (4XXXX memory references) 16 10 to write to one or more holding registers (4XXXX memory references) 17 11 report slave ID 6 characters
77 4D read measurement string 1 byte value code (request) 82 52 re-read output buffer Use after broadcast request 4.1 03 read from holding registers
Reads the binary content of holding registers (4X references) in the slave. Broadcast is also supported.
4.1.1 Request Frame
The query message specifies the starting register and quantity of registers (1 to 28) to be read. Registers are addressed starting at zero.
Here is an example of a request to read registers 40009 ... 40010 from slave device 33: Starting Register Register Count CRC Slave Address Function Code HI LO HI LO LO HI
21 03 00 09 00 02
4.1.2 Response Frame
The register data in the response message is packed as two bytes per register, with the binary contents right justified within each byte. For each register, the first byte contains the high order bits and the second contains the low order bits.
Data is scanned in the slave at the rate of 28 registers per scan. The response is returned when the data is completely assembled.
Here is an example of a response to the query:
Register Data CRC Slave Address Function Code Byte Count HI LO HI LO LO HI
21 03 04 75 03 42 15
4.2 04 read from input registers
Reads the binary content of input registers (3X references) in the slave. Broadcast is also supported
4.2.1 Request Frame
The query message specifies the starting register and quantity (1 to 28) of registers to be read. Registers are addressed starting at zero.
Here is an example of a request to read registers 30036 ... 30037 from slave device 33: Starting Register Register Count CRC Slave Address Function Code HI LO HI LO LO HI
21 04 00 24 00 02
4.2.2 Response Frame
The register data in the response message is packed as two bytes per register, with the binary contents right justified within each byte. For each register, the first byte contains the high order bits and the second contains the low order bits.
Data is scanned in the slave at the rate of 28 registers per scan. The response is returned when the data is completely assembled.
Here is an example of a response to the query:
Register Data CRC Slave Address Function Code Byte Count HI LO HI LO LO HI
21 04 04 FE 00 3E 80
The contents of registers 30036 ... 30037 are FE 00 and 3E 80 hex. 4.3 06 write to a single holding register
Pre-sets a value into a single holding register (4X reference). When broadcast, the function pre-sets the same register reference in all attached slaves.
4.3.1 Request Frame
The query message specifies the register reference to be pre-set. Registers are addressed starting at zero; register 1 is addressed as 0.
Here is an example of a request to pre-set register 40010 to 42 15 hex in slave device 33:
Register Address Register Data CRC Slave Address Function Code HI LO HI LO LO HI
4.3.2 Response Frame
The normal response is an echo of the query, returned after the register contents have been pre-set. Here is an example of a response to the query:
Register Address Register Data CRC Slave Address Function Code HI LO HI LO LO HI
21 06 00 0A 42 15
4.4 16 (10 HEX) write to one or more registers
Pre-sets values into a sequence of holding registers (4x references). When broadcast the function pre-sets the same register references in all attached slaves.
4.4.1 Request Frame
The query message specifies the register references to be pre-set. Registers are addressed starting at zero; register 1 is addressed as 0. Here is an example of a request to pre-set two registers starting at 40000 to 41 42 and 43 44 hex (Enter Password ABCD), in slave device 33: Starting Register Register Count Register Data CRC Slave Address Function Code HI LO HI LO Byte Count HI LO HI LO LO HI 21 16 00 00 00 02 04 41 42 4344 4.4.2 Response Frame
The normal response returns the slave address, function code, starting address, and quantity of registers pre-set. Here is an example of a response to the query shown above.
Starting Register Register Count CRC Slave Address Function Code
HI LO HI LO LO HI
21 16 00 00 00 02
If the password is not correct (L1 or L2 or BP), the response to the query is:
Starting Register Register Count CRC Slave
Address
Function
Code HI LO HI LO LO HI
4.5 17 (11HEX) report slave id
Returns a description of the type of controller present at the slave address. 4.5.1 Request Frame
Here is an example of a request to report the ID of slave device 33:
CRC Slave Address Function Code LO HI
21 11
4.5.2 Response Frame
The format of a normal response is shown below:
Register Data CRC Slave Address Function Code Byte Count
HI LO HI LO HI LO LO HI 21 11 06 20 4D 30 32 32 30
4.6 77 (4D HEX) read measurement string
Reads the measurement value as an ASCII string. Broadcast is also supported. See list of value codes in section 4.6.3
4.6.1 Request Frame
The query message specifies the value code of the measurement to be read. Here is an example of a response to read Total Real Power from slave device 33:
CRC Slave Address Function Code Value Code
LO HI
21 4D 04
4.6.2 Response Frame
The ASCII string in the response message is packed as data bytes. The quantity of data bytes depends on the value code.
Here is an example of the query:
String Data CRC
Slave Address
Function
Code Byte Count 1. 2. 3. 4. 5. 6. 7. 8. LO HI 21 4D 08 2B 32 31 2E 31 33 35 6B 49 35
4.6.3 Value Codes
The value codes are described in the following table:
Value Code DEC
Value Code Hex
Measurement Value Byte
Count Example String Data
00 00 Energy counter 1 15 "0000004.46kWh" 01 01 Energy counter 2 15 "0000001.24kvarh" 02 02 Energy counter 3 15 "0000005.71kWh" 03 03 Energy counter 4 15 "0000002.86kvarh" 04 04 Total Real Power 8 "+21.135k"
05 05 A Phase Real Power 8 "+7046.3" 06 06 B Phase Real Power 8 "+7037.3" 07 07 C Phase Real Power 8 "+7051.1" 08 08 Total Reactive Power 12 "1208.7 var L" 09 09 A Phase Reactive Power 12 "0400.2 var L" 10 0A B Phase Reactive Power 12 "0406.4 var L" 11 0B C Phase Reactive Power 12 "0400.9 var L"
12 0C Total I 7 "93.671" 13 0D IA 7 "31.227" 14 0E IB 7 "31.222" 15 0F IC 7 "31.222" 16 10 Average V 7 "226.06" 17 11 VA 7 "226.08" 18 12 VB 7 "225.83" 19 13 VC 7 "226.27"
20 14 Total Apparent Power 7 "21.170k" 21 15 A Phase Apparent Power 7 "7057.3" 22 16 B Phase Apparent Power 7 "7049.0" 23 17 C Phase Apparent Power 7 "7062.8" 24 18 Total Power Factor 8 "+0.998 L" 25 19 Power Factor A 8 "+0.998 L" 26 1A Power Factor B 8 "+0.998 L" 27 1B Power Factor C 8 "+0.998 L" 28 1C Frequency 7 "46.008" 29 1D Frequency 7 "46.008" 30 1E Frequency 7 "46.008" 31 1F Frequency 7 "46.008" 32 20 Total Power Angle 7 "+003.26" 33 21 Power Angle A 7 "+003.25" 34 22 Power Angle B 7 "+003.30" 35 23 Power Angle C 7 "+003.25"
Value Code DEC
Value Code Hex
Measurement Value Byte
Count Example String Data
36 24 IN 6 "93.67" 37 25 Angle AB 7 "+000.00" 38 26 Angle BC 7 "+000.01" 39 27 Angle CA 7 "-000.01" 40 28 Average Vxy 6 "000.3" 41 29 VAB 6 "000.2" 42 2A VBC 6 "000.24" 43 2B VCA 6 "000.2"
44 2C Dynamic Demand Value 1 13 "Pt=+9.818kW" 45 2D Dynamic Demand Value 2 12 "Qt=6.504kvar" 46 2E Dynamic Demand Value 3 12 "St=12.89kVA" 47 2F Dynamic Demand Value 4 12 "
I
t=56.91 A" 48 30 Max Demand Since Reset 1 13 "Pt=+11.26kW" 49 31 Max Demand Since Reset 2 12 "Qt=14.64kvar" 50 32 Max Demand Since Reset 3 12 "St=18.46kVA" 51 33 Max Demand Since Reset 4 12 "I
t=81.01 A" 52 34 Time Stamp MD 1 12 "03.SEP 14:11" 53 35 Time Stamp MD 2 12 "03.SEP 14:10" 54 36 Time Stamp MD 3 12 "03.SEP 14:10" 55 37 Time Stamp MD 4 12 "03.SEP 14:12"4.7 82 (52 HEX) re-read output buffer
This function should be used after the broadcast request. The addressed slave transmits the response frame of the previous request.
4.7.1 Request Frame
Here is an example of a request to re-read the output buffer of slave device 33: CRC Slave Address Function Code LO HI
21 52
4.7.2 Response Frame
5.
ERROR RESPONSES
When a slave detects an error other than a CRC error, a response will be sent to the master. The most significant bit of the function code byte will be set to 1 (i.e. the function code sent from the slave will be equal to the function code sent from the master plus 128). The following byte will be an exception code indicating the type of error that occurred.
The slave will ignore transmissions received from the master with CRC errors.
An example of an illegal request and the corresponding exception response is shown below. The request in this example is to read registers 0201H to 0209H. If these addresses are not supported in the slave then the following occurs:
Request Message
Starting Register Register Count
Address Function Code HI LO HI LO CRC
01 01 02 01 00 08 6D B4
Exception Response Message
Address Function Code Exception Code CRC
01 81 02 C1 91
5.1 Exception codes
Code Name Meaning
01 ILLEGAL FUNCTION The function code transmitted is not one of the functions supported by the slave.
02 ILLEGAL DATA ADDRESSES The data address received in the request is not an allowable value for the slave.
Write to password protected registers. 03 ILLEGAL DATA VALUE The value referenced in the data field
transmitted by the master is not within range for the selected data address. The register count is greater than 28 (functions 03 and 04).
06 SLAVE DEVICE BUSY The slave is engaged in processing a long duration program command. The master should re-transmit the
6.
MODBUS REGISTER MAP
The Modbus register map consists of the following columns:
Code, Address, Contents, Data type, Indicator, Values, Conditional, Register type, Min, Max, Step and Password.
Code:
Function codes as described in Section 4.0. Address:
16 bit register address starting from zero. Most Modbus master devices add 30000 or 40000 decimal to the actual address of the register.
Contents:
Description of parameters assigned to registers. Data Type:
MODBUS data types T1 etc. are described in section 7. UNSIGNED INTEGER range 0 ... 65535
one 16-bit register SIGNED INTEGER range -32768 ... 32767
one 16-bit register ASCII TEXT range 32 ... 159
16-bit registers (two ASCII codes per register)
BINARY FLAGS Each bit of a 16-bit register can be used as a binary flag. Indicator:
Each bit of a 16-bit register can be either assigned as flags or filled with binary data. Values/dependencies:
Definitions of settings, data values and any dependencies that exist between settings. Register type:
Declares whether a register is to be read/write register (setting) or a read register (data). Min, Max, Step:
The minimum and maximum numerical range and the incremental step size. Password:
There is a numerical password that allows save/abort settings and a factory accessible password constructed from the serial number that allows entry/exit to and from the calibration and configuration settings.
Code Address Contents Data Ind Reg. Type
SYSTEM DATA
04 30001 30003 Model Number T12 Data
04 30004 Serial Number T1 Data
04 30005 Software Ref 1 T1 Data
04 30006 Energy Counter 1 exponent T2 Data 04 30007 Energy Counter 2 exponent T2 Data 04 30008 Energy Counter 3 exponent T2 Data 04 30009 Energy Counter 4 exponent T2 Data
MEASUREMENTS
04 30010 30011 Energy Counter 1 T3 Data 04 30012 30013 Energy Counter 2 T3 Data 04 30014 30015 Energy Counter 3 T3 Data 04 30016 30017 Energy Counter 4 T3 Data 04 30018 30019 Total active power T6 Data 04 30020 30021 Phase active power L1 T6 Data
04 30022 30023 Phase active power L2 T6 Data
04 30024 30025 Phase active power L3 T6 Data
04 30026 30027 Total reactive power T6 Data 04 30028 30029 Phase reactive power L1 T6 Data
04 30030 30031 Phase reactive power L2 T6 Data
04 30032 30033 Phase reactive power L3 T6 Data
04 30034 30035 Total I T5 Data 04 30036 30037 I1 T5 Data 04 30038 30039 I2 T5 Data 04 30040 30041 I3 T5 Data 04 30042 30043 Average U T5 Data 04 30044 30045 U1 T5 Data 04 30046 30047 U2 T5 Data 04 30048 30049 U3 T5 Data
04 30050 30051 Total apparent power T5 Data 04 30052 30053 Phase apparent power L1 T5 Data
04 30054 30055 Phase apparent power L2 T5 Data
04 30056 30057 Phase apparent power L3 T5 Data
04 30058 30059 Total power factor T7 Data 04 30060 30061 Phase power factor L1 T7 Data
04 30062 30063 Phase power factor L2 T7 Data 04 30064 30065 Phase power factor L3 T7 Data
04 30066 Frequency T1 Data
Values/Dependencies Min Max Step Pass “ M231” 0 0 Software version 208 0 (=6 if incorrect divider @40025)(1) -6 9 1 0 (=6 if incorrect divider @40026)(1) -6 9 1 0 (=6 if incorrect divider @40027)(1) -6 9 1 0 (=6 if incorrect divider @40028)(1) -6 9 1 0
Total export active energy (default) -99999999 899999999 1 0 Total import reactive energy (default) -99999999 899999999 1 0 Pulse output 1 -99999999 899999999 1 0 Pulse output 2 -99999999 899999999 1 0 W 0 W 0 W 0 W 0
var L(if > 0); var C (if < 0) 0
var L(if > 0); var C (if < 0) 0
var L(if > 0); var C (if < 0) 0
var L(if > 0); var C (if < 0) 0
A 0 A 0 A 0 A 0 V 0 V 0 V 0 V 0 VA 0 VA 0 VA 0 VA 0 0 0 0 0 mHz 00.000 65.535 0.001 Hz 0 mHz 00.000 65.535 0.001 Hz 0
Code Address Contents Data Ind Reg. Type
04 30068 Frequency T1 Data
04 30069 Frequency T1 Data
04 30070 Total power angle T2 Data
04 30071 Phase power angle L1 T2 Data
04 30072 Phase power angle L2 T2 Data
04 30073 Phase power angle L3 T2 Data
04 30074 30075 IN T5 Data 04 30076 Angle12 T2 Data 04 30077 Angle23 T2 Data 04 30078 Angle31 T2 Data 04 30079 30080 Average U∆ T5 Data 04 30081 30082 U12 T5 Data 04 30083 30084 U23 T5 Data 04 30085 30086 U31 T5 Data
04 30087 30088 Dynamic demand value 1 T6 Data 04 30089 30090 Dynamic demand value 2 T6 Data 04 30091 30092 Dynamic demand value 3 T6 Data 04 30093 30094 Dynamic demand value 4 T6 Data 04 30095 30096 Max demand since reset 1 T6 Data 04 30097 30098 Max demand since reset 2 T6 Data 04 30099 30100 Max demand since reset 3 T6 Data 04 30101 30102 Max demand since reset 4 T6 Data 04 30103 30104 Time stamp MD 1 T8 Data 04 30105 30106 Time stamp MD 2 T8 Data 04 30107 30108 Time stamp MD 3 T8 Data 04 30109 30110 Time stamp MD 4 T8 Data 04 30111 Time into period (minutes) T1 Data
04 30112 U1 THD% T16 Data 04 30113 U2 THD% T16 Data 04 30114 U3 THD% T16 Data 04 30115 U12 THD% T16 Data 04 30116 U23 THD% T16 Data 04 30117 U31 THD% T16 Data 04 30118 I1 THD% T16 Data 04 30119 I2 THD% T16 Data 04 30120 I3 THD% T16 Data
Values/Dependencies Min Max Step Pass mHz 00.000 65.535 0.001 Hz 0 mHz 00.000 65.535 0.001 Hz 0 0.01 deg -180.00 +179.99 0.01 deg 0 0.01 deg -180.00 +179.99 0.01 deg 0 0.01 deg -180.00 +179.99 0.01 deg 0 0.01 deg -180.00 +179.99 0.01 deg 0 A 0 0.01 deg -180.00 +179.99 0.01 deg 0 0.01 deg -180.00 +179.99 0.01 deg 0 0.01 deg -180.00 +179.99 0.01 deg 0 V 0 V 0 V 0 V 0
Total active power 0
Total absolute reactive power 0
Total apparent power 0
Total I 0
Total active power 0
Total absolute reactive power 0
Total apparent power 0
Total I 0 0 0 0 0 0 0.01 % 0.00 400.00 0.01 % 0 0.01 % 0.00 400.00 0.01 % 0 0.01 % 0.00 400.00 0.01 % 0 0.01 % 0.00 400.00 0.01 % 0 0.01 % 0.00 400.00 0.01 % 0 0.01 % 0.00 400.00 0.01 % 0 0.01 % 0.00 400.00 0.01 % 0 0.01 % 0.00 400.00 0.01 % 0 0.01 % 0.00 400.00 0.01 % 0
Code Address Contents Data Ind Reg. Type
16 40000 40001 Enter Password L1 & L2 & BP T11 A…Z Write only 16 40002 40004 Enter Configuration Password T12 A…Z Write only 16 40005 40006 Set Password level 1 T11 A…Z Write only 16 40007 40008 Set Password level 2 T11 A…Z Write only 3, 6, 16 40009 40010 Time(8)
T9
Setting
3, 6, 16 40011 40012 Date(8)
T10
Setting
6 40013 Reset Counter & MD T1 Bit-0 write only Bit-1 Bit-2 Bit-3 Bit-8 Bit-9 Bit-10
3 40014 Calibration Voltage in V T1 read only 3 40015 Calibration Current in A/10 T1 read only 3, 6 40016 Voltage Tr. Primaries in V/10(4) T1
Setting
bit # 0…13 1…15999 bit # 14…15 0…3 3, 6 40017 Voltage Tr. Secondaries in V(5) T1Setting
3, 6 40018 Current Tr. Ratio(6) T1Setting
3, 6 40019 Connection Mode(7) T1 1Setting
9 25 5 73, 6 40020 Communication Settings T1 0
Setting
1 2 3 4 5 6 7 Bit-3 Bit-4 Bit-5 Bit-6 Bit-7Values/Dependencies Min Max Step Pass 0 0 1 2 1 1 Reset Counter 1 1 Reset Counter 1
Reset pulse output Counter 1 Reset pulse output Counter 2 Synchronise MD
Reset last period MD Reset MD Values
1 V 0 10 A/10 = 1 A 50 A/10 = 5 A 0.1 V 0
2300 for 230 V 0.1 V 2
Unsigned integer value 1 15999 1
Unsigned exponent 0 3 1
10 775 1 V, 5 V 2
1 4000 1 2
Single phase 2
3 phase 3 wire balanced 3 phase 4 wire balanced 3 phase 3 wire unbalanced 3 phase 4 wire unbalanced
1200 baud 2 2400 baud 4800 baud 9600 baud 19200 baud 38400 baud 57600 baud 115200 baud
‘1’ => 2 stop bits; ‘0’ => 1 stop bit ‘1’ => Odd parity; ‘0’ => Ev en parity ‘1’ => Parity; ‘0’ => No parity ‘1’ => 7 bits; ‘0’ => 8 bits (read only) > 10 ms response time
Code Address Contents Data Ind Reg. Type
3, 6 40022 MD Setting bits # 0…7 T1 0
Setting
1…255bits # 8…15 0
1 2…15 3, 6 40023 Counter 2 mode, bits # 0…7(3)
T1 Bit-0
Setting
Bit-1 Bit-2 Bit-3 Bit-5 Bit-6 Bit-7 Counter 1 mode, bits # 8…15(3)Bit-8 Bit-9 Bit-10 Bit-11 Bit-13 Bit-14 Bit-15 3, 6 40024 Counter 4 mode, bits # 0…7(3)
T1
Setting
Counter 3 mode, bits # 8…15(3)
3, 6 40025 Counter 1 divider T1
Setting
3, 6 40026 Counter 2 divider T1
Setting
3, 6 40027 Counter 3 divider T1
Setting
3, 6 40028 Counter 4 divider T1
Setting
40029 40079 RESERVED
3, 6 40080 Starting current T1
Setting
3, 6 40081 Quartz frequency correction T2
Setting
3, 6 40082 Calibration status T1 Bit-0Setting
Bit-1 Bit-2 Bit-3 Bit-4 Bit-5 Bit-6 Bit-7 Bit-8
Values/Dependencies Min Max Step Pass
Disable 2
Time constant (window period; interval of sub-period) Thermal function
Fixed window
Sliding window; # of periods
Enable quadrant 1 2 Enable quadrant 2 Enable quadrant 3 Enable quadrant 4 Absolute value Inverted value
‘1’ => Reactive energy; 0 => Active energy Enable quadrant 1 Enable quadrant 2 Enable quadrant 3 Enable quadrant 4 Absolute value Inverted value
‘1’ => Reactive energy; 0 => Active energy
Same as Counter 2 mode 2
Same as Counter 1 mode 1, 10, 100, 1000, 10000(1) 2 1, 10, 100, 1000, 10000(1) 2 1, 2, 5, 10, 20, 50, …, 50000(1) 2 1, 2, 5, 10, 20, 50, …, 50000(1) 2 320 for 0.2% 3 -128 127 1 3 I1, range HI 3 I2, range HI I3, range HI I1, range LO I2, range LO I3, range LO U1 U2 U3
Code Address Contents Data Ind Reg. Type Bit-9 Bit-10 Bit-11 Bit-12 Bit-13 Bit-14
6 40083 Calibration request T1 Bit-0 write only Bit-1 Bit-2 3, 6 40101 Language T1 0
Setting
1 2 3 4 5 63, 6 40102 Active access level T1
Setting
16 40110 40111 Set Energy counter 1(2)T3 write only 16 40112 40113 Set Energy counter 2(2)
T3 write only 16 40114 40115 Set Energy counter 3 T3 write only 16 40116 40117 Set Energy counter 4 T3 write only
