Mx3IPG2A

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MX3IPG2A

Multiple-Function Protection for Generator

(R< - Ucc< - Ucc>)

TECHNICAL MANUAL

MDE/C133 2561 001

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This device belongs to the Modulex 3 line and digitally proc-esses the currents and voltages injected into the rotor winding of synchronous machines, through the use of the attachment X2/IPG2A, to provide a rotor ground protection besides a number of additional functions, among which are the direct over- and undervoltage monitoring (Vaux control).

The user interface is available locally through a display unit, and remotely, through a LONWORKS (TM)_{field bus with a control}

and monitoring system.

It is furthermore capable of communicating with a Personal Computer through a connector located on the relay front and an interface programme. This feature makes it easier and safer to programme the setting parameters and configure and read the set values, measurements and logged events; the programming can also be taken from previously created files. Protective functions:

minimum resistance with two thresholds with definite time operating characteristic

injected overcurrent with one threshold with definite time operating characteristic

injected undervoltage with fixed threshold with fixed time operating characteristic

injected overvoltage with fixed thresholds with fixed time operating characteristic

direct undervoltage with two thresholds with definite time operating characteristic

direct overvoltage with two thresholds with definite time operating characteristic

possibility of two groups of settings, namely main and spare

Measurement functions:

resistance values stated in Ω

injected current value stated in A

injected voltage value stated in V

direct voltage values stated in Un

injected overcurrent value stated in A

logging of the latest 8 events with storage of tripped thresholds values, date, time and injected current and direct voltage values as measured when the fault showed up

fault recorder: recording, for 2.5 s in all, of the instant values (12 samples per period ) taken by the input quantities (Iinjected,Vinjected,Vdirect), as well as of the 19 logical states among which digital inputs and additional timers are found

RCE logging: recording of the latest 32 changes of state (with related date and time); only available through PC or via network. .

Other functions:

selection of the setting range of the direct voltage thresh-olds by means of internal jumpers

selection of the rated frequency between 50Hz and 60Hz

selection of dialogue language (Italian, English, French and Spanish)

self-monitoring with detailed indication of fault and alarm type through LED's and "normally energized" output relay (X6)

possibility of serial communication both with a local PC or via a LONWORKS (TM) _{field bus}

three auxiliary timers available free for allocation to digital inputs

possibility of assigning one or more device functions to each output relay and LED

possibility of separately setting all output relays as "all normally energized" or "all normally normally de-energized"

possibility of selecting, for each output relay and LED, the monostable or bistable (hand-reset) operating mode

possibility of assigning a minimum pulse width to each output relay

opto-insulated digital inputs programmable for lockout, drive and reset functions, each input being enabled by normal energizing or de-energizing. Optionally, they may be used to supervise the tripping circuit for continuity

a partial and a total counter per trip threshold

MINIMUM RESISTANCE PROTECTION (rotor ground) Settings

first threshold R<: 200÷4000 Ω / OFF starting signalling delay tstart: 0.00 ÷ 9.99 s definite time trip delay t1: 0.05 ÷ 600 s second threshold R<<: 200÷4000 Ω / OFF starting signalling delay tstart: 0.00 ÷ 9.99 s definite time trip delay t2: 0.05 ÷ 600 s

threshold settings step: 1

time setting step: 0.01

threshold variation as a function of variation occurring between winding and mass:

Capacity [µµµµµF]

Threshold [

ΩΩΩΩΩ

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OVERCURRENT PROTECTION

measurement range: 0 ÷ 1.2 A

Settings

threshold I~>: 0.01÷0.10 A / OFF

starting signalling delay tstart: 0.00 ÷ 9.99 s definite time trip delay t3: 0.05 ÷ 600 s

threshold settings step: 0.001

time setting step: 0.01

UNDER/OVERVOLTAGE PROTECTION (diagnostics)

undervoltage threshold : 28 V

trip delay : 2 s

overvoltage threshold : 52 V

trip delay : 2 s

DIRECT UNDER/OVERVOLTAGE PROTECTION

rated voltage (jumper in S20) Un: 30 ÷ 300 V rated voltage (jumper in S21) Un: 3 ÷ 30 V rated voltage (jumper in S22) Un: 0.3 ÷ 3 V rated voltage (jumper in S23) Un: 0.03 ÷ 0.3 V first undervoltage threshold U-<: 0.5 ÷ 1.2 Un / OFF starting signalling delay tstart: 0.00 ÷ 9.99 s

trip delay t4: 0.02 ÷ 600.00 s

second threshold di minima tensione U-<<: 0.5 ÷ 1.2 Un / OFF starting signalling delay tstart: 0.00 ÷ 9.99 s

trip delay t5: 0.02 ÷ 600.00 s

first overvoltage threshold U->>: 0.5 ÷ 1.2 Un / OFF starting signalling delay tstart: 0.00 ÷ 9.99 s

trip delay t6: 0.02 ÷ 600.00 s

second overvoltage threshold U->>: 0.5 ÷ 1.2 Un / OFF starting signalling delay tstart: 0.00 ÷ 9.99 s

trip delay t7: 0.02 ÷ 600.00 s

settings step: 0.01

ADDITIONAL SETTINGS

rated frequency fn: 50 or 60 Hz

minimum pulse width of end relays timp: 0.02 ÷ 1 s

additional timer tX1: 0.02 ÷ 600 s

Auxiliary power supply

MX3IPG2A.11, .61 and .71 versions

Uaux: 19 ÷ 100 Vcc Uaux: 19 ÷ 72 Vca MX3IPG2A.12, .62 and .72 versions

Uaux: 64 ÷ 300 Vcc Uaux: 64 ÷ 275 Vca X2/IPG2A attachment Uaux: 10 ÷ 315 Vca frequency for Uaux in c.a.: 47 ÷ 63 Hz burden (minimum/maximum) in d.c.: 5 W / 10 W burden (minimum/maximum) in a.c.: 10VA / 20VA burden of X2/IPG2A attachment in c.a.: 5 VA Output contact rating

rated current: 5 A

breaking power (110 Vcc; L/R= 40 ms; 105_operations): _{0.3 A}

make and carry for 0.5 s: 30 A

mechanical durability: 106_operations

Digital inputs

MX3IPG2A.11, .61 and .71 versions

Uaux IN DIG: 19 ÷ 100 Vcc maximum series lead resistance: 8.8 kohm with additional external resistor, rated 4.7 kohm 2 W 30 ÷ 150 Vcc with additional external resistor rated 18 kohm 7 W

Errors of measuring equipment

Resistance threshold

relative error: ≤ 3 % of set value (with min. value 20 Ohm)

consistency : ≤ 1 % of set value

Current threshold

relative error: ≤ 3 % of set value + 0.005 A consistency: ≤ 1 % of set value + 0.005 A Voltage thresholds

relative error : ≤ 2.5% + 1 V

consistency : ≤ 1% + 1 V

Direct voltage thresholds

relative error (selector Un: S20): ≤ 3% (minimum 1 V) (selector Un: S21): ≤ 3% (minimum 100 mV) (selector Un: S22): ≤ 3% (minimum 10 mV) (selector Un: S23): ≤ 3% (minimum 1 mV) relative error : (selector Un: S20): ≤ 1% (minimum 1 V) (selector Un: S21): ≤ 1% (minimum 100 mV) (selector Un: S22): ≤ 1% (minimum 10 mV) (selector Un: S23): ≤ 1% (minimum 1 mV) Error variation

as frequency varies within the range ± 5% fn and with ≤ 5% distortion factor

Current threshold

relative error: ≤ 1 % of set value + 0.0025 A Voltage threshold

relative error : ≤ 1% + 1 V

as temperature and Uaux vary within the operating range Current threshold

relative error: ≤ 0.5% of set value + 0.001 A Voltage threshold

relative error : ≤ 0.5% + 1 V

Direct voltage threshold

relative error (selector Un: S20): ≤ 0.5% (minimum 1 V) (selector Un: S21): ≤ 0.5% (minimum 100 mV) (selector Un: S22): ≤ 0.5% (minimum 10 mV) (selector Un: S23): ≤ 0.5% (minimum 1 mV) for asymmetric values

transient overreach: ≤ 5%

Time errors

relative error on definite times: ≤ 3% or 20 ms consistency on definite times: ≤ 1% or 20 ms Variation of time errors

as temperature and Uaux vary within the operating range

relative error on definite times: ≤ 0.5% or 10 ms Other characteristics

reset ratio for maximum thresholds: > 0.95 reset ratio for minimum thresholds: < 1.05

reset time: ≤ 50 ms

overshoot: ≤ 30 ms

Operating ranges

service temperature: -10 °C ÷ +60 °C

storage and transport temperature: -25 °C ÷ +80 °C relative humidity: < 95% with no formation of condensate vibration: IEC255-21-1; class 2; 0.075mm 10-60Hz; 1g 60-500Hz

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Protection Class

device: IP52

upon request when flush-mounted in a panel: IP66 terminal board with mounted cover: IP20 Insulation

To ground and between two independent circuits whatsoever: 2 kV, 50 Hz per minute

Impulse test: 5 kV 1.2/50 µs

Electromagnetic compatibility

89/336/CEE : EN50081-2 EN50082-2 Directive For industrial environments

UNIPEDE NORM(SPEC)13 "Automation and control apparatus for generating station and substation"

ENEL R_EMC_02 "Apparati di automazione e controllo per centrali e stazioni elettriche".

conditions of electromagnetic compatibility:

IEC 1000-4-8 EN 61000-4-8 lev.5; 1000 A/m IEC 1000-4-10 EN 61000-4-10 lev.5; 100 A/m IEC 1000-4-3 ENV 50140 lev.3; 10 V/m 77B(Sec)1 ENV 50204 lev.3; 10 V/m IEC 1000-4-2 EN 61000-4-2 lev.4; 8kV contact;15kV air-break 77A/120/CD lev.4 / 3; 300V / 10-1-1-10 V IEC 1000-4-5 EN 61000-4-5 lev.4; 4kV 1.2/50 µs IEC 1000-4-12 EN 61000-4-12 lev.3; 2.5 kV IEC 1000-4-4 EN 61000-4-4 lev.4; 4 kV 77B/144/DIS ENV 50141 lev.3; 10 V

77A(Sec)99 lev.2; 10%

IEC 1000-4-11 EN 61000-4-11 > 20 ms IEC/CISPR 11 EN 55011 group 1 class A Reference standards

CEI 95-1 EN 60255-6 IEC 255 Low voltage directive 73/23/CEE

2. GENERAL CHARACTERISTICS

The device features a mechanical casing that is 4U in height, and as wide as to allow up to 4 pieces to be accommodated in a 19" rack, in addition to normal flush mounting.

The casing is made of a hot-galvanized PVC-coated plate frame inside which the moving part that carries all the elec-tronic circuits and the local interface slides on guides. The pull-out action is facilitated by the presence of special "handles" which, when the device is "plugged in", are also used to lock the two parts. The aluminium frame of the moving part renders the latter excellently rigid.

The device-system interface terminal blocks are located on top of the casing and, for each electrical connection, a screw clamp is available apt to receive up to 2 cable terminals, 4mm2

in size. Using a special accessory that is included in the supply, the connection can also be made through Faston members.

Special error-fighting codes do not allow relays other than those compatible with the housing to be inserted.

A cover lid classes the terminal block within the IP20 protection class.

When the moving part is pulled out, the current inputs are automatically short-circuited, whereas the voltage and auxil-iary circuits are disconnected.

The device front bears two labels:

one plate lists the factory configuration of the device, namely auxiliary voltage, rated current and frequency;

The other plate, always in accordance with the factory configu-ration, provides an explanation of LED's indications. Both labels are easily replaced with new ones, which can bear any information as required by the client.

As far as the factory configuration relevant to output relays, LED's, digital inputs and relevant settings are concerned, please refer to tables A, B and C.

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2.1 Selecting rated values

The selection of the rated current between 1 or 5 Ampères for phase protection is made by acting on a jumper that is located by one of the following points: S20, S21, S22, S23, which can be reached once the relay has been pulled out (see fig. 1, 4a, 4b, 4c, 4d).

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WARNING

Dangerous voltages may remain in the device even when the latter has been de-energized or pulled-out of its casing (capacitor's memory)

fig. 1

3. OPERATION

3.1 Underresistance protection (rotor ground)

The underresistance protection works by comparing the ratio between voltage and current injected into the attachment X2/ IPG2A with the set thresholds (R<,R<<): when the calculated resistance falls below a given threshold,causes the tstart and the trip timers t1 t2 to trip. If the value remains below the threshold, once the associated tstart delay is over, the delayed start command is sent.

If the tripping timers also reach the set overtime, the tripping command is sent; the partial and total counters related to the tripped threshold increase their counts and the event logging session starts.

If a special digital input is enabled which has been set to lock one or more thresholds, the starting registers are held at zero, thus preventing operation as long as the input remains ena-bled.

Threshold R< has a definite time characteristic in the form: t = t1

3.2 Overcurrent protection (input I)

The device is equipped with an overcurrent threshold (injected by attachment X2/IPG2A) associated to a tstart and a trip timer. The overcurrent threshold trip may be locked by feeding a special digital input purposely set to suit the purpose.

3.3 Undervoltage protection (diagnostics - input U)

The device is equipped with an undervoltage threshold (ap-plied to attachment X2/IPG2A) associated to a timer. The trip of the undervoltage threshold can be locked by feeding a special digital input purposely set to suit the purpose.

3.4 Overvoltage protection (diagnostics - input U)

The device is equipped with an overvoltage threshold (injected by the attachment X2/IPG2A) associated to a timer. The trip of the undervoltage threshold can be locked by feeding a special digital input purposely set to suit the purpose.

3.5 Direct undervoltage protection (input Ucc)

The device is equipped with a direct undervoltage threshold associated to a tstart and a trip timer. The direct undervoltage threshold trip can be locked by feeding a special digital input purposely set to suit the purpose.

3.6 Direct overvoltage protection (input Ucc)

The device is equipped with a direct overvoltage threshold associated to a tstart and a trip timer. The direct overvoltage threshold trip can be locked by feeding a special digital input purposely set to suit the purpose.

TOP

RELAY FRONT

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3.7 Main and spare settings

The device can store two groups of settings, named 'main' and 'spare' settings, which can be programmed through the keyboard, a Personal Computer or a network.

The current settings are indicated on the display unit with the text 'SETTINGS IN USE'.

The device, notwithstanding the selections made, can be "forced" to use the SPARE settings. Such forcing can be enabled from the network or through a continuous signal to be sent to the digital input (IN DIG 1), previously set to implement this function. This condition is signalled by the presence of the characters <!> next to the selected settings; when the signal drops, the previously selected group of settings is enabled again, whereas the characters <!> disappear (see paragraph 6.1.3).

4. ADDITIONAL FUNCTIONS

4.1 Diagnostics

Diagnostic activities are envisaged which are automatically carried out upon powering on the device as well as from time to time during the running, and which provide the following actions:

- signalling fault or failure conditions. This signal de-energizes the diagnostic relay, turns off the green LED (indicating running system) and lights up the red LED (indicating system failure).

- system lock-out in the event of faults that might entail ill-timed operation (VITAL FAULTS).

- failure code display.

The following failures are classed as NON-VITAL FAULTS: - output relay(s) (X1 - X5) failure

- communication failure - internal clock failure

The following failures are classed as VITAL FAULTS: - feeder failure

- EEPROM failure

- internal or external RAM failure - Analogue/Digital converter failure

In the presence of vital faults, the device will automatically displays the fault code; this condition can only be reset, if the equipment allows this condition to be reset, by enabling the "settings change' command.

In the event of , upon starting up the equipment, an EEPROM failure making it impossible to retrieve the information on the selected dialogue language, the device will continue working using Italian as the default dialogue language.

The device includes the 'Watch Dog' function.

The diagnostic activity is also aimed at signalling any condition of "inhibited equipment"; this condition is displayed with a dedicated code, the diagnostic relay is de-energized and the red LED (faulty device) lights up. This condition can only be reset by enabling the 'change settings' command.

The diagnostic menu also indicates the date when last changes were made to the equipment.

4.2 Output circuits

The output circuits are composed of six relays, each of them equipped with two contacts (see block diagram).

The X6 relay, normally energized, is strictly assigned to the diagnostic function.

Each of the five relays left, if duly programmed from the keyboard, a Personal Computer or a network, can be: - set to perform one or more functions

- preset for:

- monostable operation: immediate return to the quiescent position when the cause that operated it is removed. - bistable operation (MEMOR): the tripping position is main-tained until a reset signal comes from the front push-button, the digital input or the serial connection.

- a minimum duration of the signal or command (t_IMP). The output relays, except for the diagnostic relay, can all be simultaneously set to "normally energized" (NORMAL.ON=ON) or "normally de-energized" (NORMAL.ON=OFF): this selection is made by acting on the settings change function.

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4.3 LED signalling circuits

The signalling circuits are made of twelve LED's (see fig. 5). Four LED's are rigorously assigned to previously established signalling functions:

- (Uaux) green LED ON in the presence of input voltage and with correct feeder output voltage values

- (RUN) green LED ON with fixed light in normal conditions and blinking during setting changing and testing functions - (RUN) red LED ON with fixed light when the diagnostic

detects a fault or a condition of inhibition.

- (Rx Tx) green LED ON with fixed light when the device is correctly connected, blinking with the communication board not enabled or not properly set; OFF when the communication board is not present on the device. Each of the eight LED's left, if duly programmed from the keyboard, a Personal Computer or the network, can be: - set to perform one or more functions

- preset for:

- monostable operation; it immediately goes off when the cause that made it go on is removed

- bistable (MEMOR) operation; the LED remains ON until a reset signal is sent from the front push-button, the digital input or the serial connection. Any failure of auxiliary voltage only entails a momentary loss of the luminous signals, which come back again as soon as voltage is restored. A pocket is provided close to the LED's, where LED describing labels can be placed.

4.4 Digital Inputs

Each of the three optoisolated inputs can be associated with one or more protection functions by duly programming them through keyboard, Personal Computer or via network. The input voltage may happen not to match the auxiliary voltage of the device.

The digital inputs can be programmed to be enabled by normal energizing or normal de-energizing.

4.5 Additional timers

All the optoisolated inputs (IN DIG 1,IN DIG 2,IN DIG 3) can be programmed to be associated with additional timers (t_X1, t_X2, t_X3).

When the programmed input is energized, the associated additional timer is started, and if the timer reaches the overtime status, the tripping signal is sent and maintained until the input is reset.

4.6 Counters

Each tripping threshold is associated with a partial and total counter.

The counters work within the 0-9999 range; if number 9999 is exceeded, the counter is automatically reset and the count restarts from the beginning.

All of the partial counters can be reset by acting through the keyboard, a Personal Computer or via network.

4.7 Event logging

When a tripping event occurs, the following information is stored in the circulating memory:

- first operated threshold

- day, month, year, time, minute, second and millisecond identifying the tripping moment.

- values measured when the tripping occurred. The information concerning one trip is called event.

The circulating memory allows the last 8 events to be stored, and when this number is exceeded, a new record replaces the older: the last event is stored as EVENT 1.

The stored events can be read from the front display unit or from a PC serially connected to the device.

The device can also record the latest 32 changes of state (with related date and time) and make them available exclusively through PC or via network.

4.8 Measurements

The device is in a position to display the effective present values of resistance, expressed in Ohm, direct voltage, ex-pressed in Un, injected alternating voltage stated in V and injected alternating current stated in A .

The unit also displays the maximum value of injected alternat-ing current stated in A ever measured by the latest 'Reset maximum values'

4.9 Test

Besides the normal diagnostic already dealt with, the device also offers, in the TEST mode, the possibility of testing the LED's, the display unit and the output relays.

- The LED test turns on all the LED's, from L1 to L8, and the display unit (LCD) for two seconds.

Once the test is over, the LED's that were supposed to be ON before the test remain ON and the display unit goes back to the previous information displayed. The test can also be performed in any operating condition, without affecting the operation in progress.

- the relay test allows the output relays X1 to X5 to be sequentially selected and checked for correct operation. In this way, any external signalling or control circuit can be tested, too.

The tested relay remains energized for 150 to 200 ms. If starting or tripping commands are already present, the test is not carried out and a dedicated message appears on the display unit.

The test on auxiliary relays does not affect counters, event logs and LED's.

4.10 Alphanumeric user identifier

The device can be identified in the plant by an alphanumeric code, which can be set by the user directly on the equipment or from a PC. With a network-linked device, the alphanumeric code can only be modified by operating through the network.

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4.11 Language

The device can display information in four languages: Italian, English, French and Spanish. The language can be selected through the keyboard.

4.12 LCD settings

The display can be set for fixed (OFF) or timed (ON) back-lighting; in the last case, the display lights up for 300s any time a key is pressed .

4.13 Inhibiting operation - Deconfiguration via network Inhibiting the device is required in operating plants, to avoid inefficiency on feeding a protection whose settings are un-known or need to be changed.

The inhibition is performed by holding the settings change button pressed for about 2 s,while injecting the auxiliary voltage until the following message is displayed:

[ BLOC ] [ ]

On releasing the push-button, the condition of inhibited device is signalled by a diagnostic message of P fault.

The normal operating conditions can only be restored by moving to the settings change function, which is enabled at all events; a temporary loss of the auxiliary voltage supply does not affect the inhibited state of the device.

If the device is also equipped with a field-bus board, by holding the settings change push-button further pressed for about 2s, in the BLOC state, the device will display:

[ NET RESET ? ] [_ NO YES _]

if a confirmation is provided, the device can also be made lose its network configuration.

The full procedure for inhibiting and de-configuring the device via network must be enacted any time you need to replace the unit.

By resetting an inhibited and deconfigured unit, a K fault message is displayed and remains displayed until the unit is configured anew.

Operation can only be reset by moving to the settings change function, which is enabled in any case.

fig. 2 RELAY FRONT TOP SIDE BOARD NOT ENABLE BOARD ENABLE

A-A VIEW A-A VIEW

A-A VIEW

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CAUTION

Hazardous voltages can remain in the device even when the latter has been de-energized or pulled out of its casing (condenser memory).

4.14 Serial communication on LONWORKS (TM) _bus

The device, in the version including the special bus board, can communicate with a central monitoring and control system at a speed equalling 1.2 5 Mbaud. The connection to the field bus is made through terminals: 43 and 45.

The communication board, which can be also added later, is only enabled if the special S6 jumper is correctly connected, while it is not in the case the jump is connected in vertical position across S5 and S6 (see fig. 2).

If the S6 jumper is connected when the communication board is not present, the diagnostic function displays a message of failure, behaving as if the board was present and faulty. Appendix A lists the parameters available for the network.

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4.15 RS485 serial communication and MODBUS protocol Concerning the communication of devices provided with software version 2.00 and subsequent, three different versions are possible:

- whitout any communication card (version MX3IPG2A .11 e .12);

- provided with LonWorks(TM)_{communication card (version}

MX3IPG2A .61 e .62);

- provided with Modbus communication card (version MX3IPG2A .71 e .72);

The identification of the installed communication card is automatic.

When using an unit provided with LonWorks(TM)_{communication}

card, it's required first to effect the relay wiring according to its wiring diagram and later proceed with the configuration of all connected devices; the automatic configuration of connected devices is possible by connecting a PC provided with PCLTA10 or SLTA10 card, in which CORMOX2 software has been installed.

When using a device provided with Modbus communication the configuration of each relay may be realized by the front interface, or by the IRMA2 program installed on a PC connected to the relay via front plug. The configuration may be realized also on relays not jet connected together and may be eventually organized in files together with all other settings.

Modbus communication card configuration requires:

PARAMETER VALUE Speed 300 Baud 600 Baud 1200 Baud 2400 Baud 4800 Baud 9600 Baud 19200 Baud 38400 Baud Parity NONE EVEN ODD Data Bit 7 8 Stop Bit 1 2 Address 1 - 255 (0 broadcast)

This parameters can be programmed in local or remote mode. So, the following extension of the 'RELAY DATA' menu is available:

[MX3IPG2A ] relay type

[Sw Vers 2.00/01] software version

ñ ò

[PLANT IDENTIFIER]

[GenPan ] ðplant identifier

ñ ò

[SPEED 38400 Bb] ðspeed setting

[PARITY NONE ] ðparity setting

ñ ò

[DATA BIT 8 ] ðdata bit setting

[STOP BIT 1 ] ðstop bit setting

ñ ò

[ADDRESS 111 ] ðaddress setting

[ ]

On demand is available documentation about LonWorks(TM)_{and Modbus}

versions.

4.16 Fault recorder

The device can record the course of input currents (Ia, Ib, Ic, Io) and the logic states of the 8 LED's, the 5 auxiliary relays, the 3 digital inputs and the 3 additional timers. The total recording time equals 2.5s, and can be divided into variable time before start-up and variable time after start-up. The fault recorder function can be started for: tstart, tripping, enabling of digital inputs and timers. The selection of the starting parameters, the graphic display and reset of fault recorder can be made through a PC or a network. The function can even be reset by interrupting the auxiliary voltage for a short while.

4.17 Checking tripping circuits for continuity

The use of a digital input enabled by normal de-energizing combined with one of the TX timers allows the tripping coil circuit to be monitored for continuity, whether the breaker is closed or open.

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5. LOCAL INTERFACE Key It scrolls the menu to the left or selects the digit to be changed, if the settings change function is enabled. [ï] Key It resets the stored LED signals if the

cause has been removed, or the par-tial counters, if you are in the "display counters" menu.

It takes the end relays to quiescent state when they are set to bistable operation.

Key If pressed for at least 2s, this key enables the settings to be changed. When the settings change is ena-bled, the green LED (RUN) lights up blinking. If pressed once again for at least 2s, the system goes back to the normal running conditions and, pro-vided that a confirmation is given, the new settings become the current ones (the key can only be reached by removing the cover). During the set-ting change operations, the device continues working with the old set-tings. If the changes made are con-firmed in the presence of a fault, they are not made the current ones until the event is over: the interrupt state is signalled for 3s by a message on the display unit, after which you are prompted to confirm the changes made.

If pressed upon feeding the device with auxiliary voltage until a failure message appears on the display, this key inhibits the device from oper-ating.

Keys If simultaneously

pressed for at least 2s, these keys enable the protection to be tested. When the testing activity is enabled, the green LED (RUN) lights up blink-ing.

If simultaneously pressed for at least 2s during the TEST routine, these keys enable you to leave the protec-tion testing mode.

The local interface is made up of:

- An LCD display unit organized on two lines of sixteen characters each.

Through a special keyboard-controlled scanning, the dis-play unit enables the settings to be read and changed, the measurements, the counters, the logged events and the diagnostic information to be read.

- A keyboard or keypad made up of six keys, five of which can even be reached when the cover is fitted through a special link.

In addition to the above-mentioned scanning, the keyboard is also used to change the settings, to carry out tests that require commands to be sent and stored indications to be set to zero. The keys that can be reached when the cover is fitted only allow for read-out and reset operations.

Key It scrolls the menu upwards or in-creases a value, if the settings change function is enabled. [ñ] Key It scrolls the menu downwards or

decreases a value, if the settings change function is enabled. [ò] Key It scrolls the menu to the right or

se-lects the digit to be changed, if the settings change function is enabled [ð].

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- Twelve LED's, four of which are rigorously dedicated to general running functions.

- A four-pin connector in compliance with FCC 68.

By means of a special optoelectrical adapter, an optical fibre cable and a RS232 optical converter, it allows the device to be locally linked with a personal computer. The P.C., through a special interface programme, makes it possible to read and change the settings, to read the measurements, the counters, the logged events, the diag-nostic information and the fault recorder.

6. LCD MENU STRUCTURE

Here follows an example showing how to change the dialogue language. Suppose we wish to set ENGLISH as the desired language.

a) Press the key ò or ñ until the following message appears on the display:

[MENU: ITALIAN ] [ ]

b) By pressing the key ð the language change function is enabled, and the following message appears on the display:

[MENU: ITALIAN ] [ ]

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By pressing ò or ñ you scroll the stored languages menu. For the purpose of our example, we must stop when the following message is displayed:

[MENU: ENGLISH ] [ ]

d) By pressing ï you confirm the selected dialogue language and go back to the main menu. The following message appears on the display:

[MENU: ENGLISH ] [ ]

6.1.2 Change date and time

Access to "change date/time" is denied when the protection is network-connected. If the network connection is made after entering the change function, the local changes are not ena-bled.

Let us assume we wish to change the starting date 10/06/93 into 24/05/95.

a) Press the key

ò

or

ñ

until the display shows:

[DATE 10/06/93] [TIME 9:38:43]

b) By pressing the key ð the change function is enabled and the following message appears on the display:

[DATE 10/06/93] [TIME 9:38:43]

c) By pressing ð select the value to be changed. To select the last digit that makes up the date, press ð six times, the displays will show:

[DATE 10/06/93] [TIME 9:38:43]

d) By pressing ñ, increase the selected value. Hold the key pressed until the display shows:

[DATE 10/06/95] [TIME 9:38:43]

e) By pressing ï , select the fourth digit that makes up the date, the display will show:

[DATE 10/06/95] [TIME 9:38:43]

f) By pressing ò, decrease the selected value until the display shows:

[DATE 10/05/95] [TIME 9:38:43]

g) By pressing ï twice further, select the second digit that makes up the date, and the display will show:

[DATE 10/06/95] [TIME 9:38:43]

h) By pressing ñ, change the selected value (upon reaching number 9, the tens will go up by one unit) until the display shows:

[DATE 24/05/95] [TIME 9:38:43]

i) Press ï until you move to the beginning of the line. The display will show:

[DATE 24/05/95] [TIME 9:38:43]

j) By pressing ò the "change time" function is enabled. The steps are the same as those described in c) to i).

The device does not accept time or date settings that do not exist.

The time counting starts upon moving from the digits that make up the time to the wording TIME at the beginning of the line. k) By pressing ï the changes made are confirmed and the system moves back to the main menu. The display will show:

[DATE 24/05/95] [TIME 9:38:43]

6.1.3 Display settings in use

a) Press ò or ñ until the display shows, for instance:

[SETTINGS IN USE:] [ MAIN]

The second line will display the group of settings the device currently uses.

Any <!> possibly displayed, notwithstanding the contents of the second line, indicates the device is working with the SPARE settings.

[SETTINGS IN USE:] [ <!> MAIN]

The device will continue working with the SPARE settings as long as the "change settings" command sent by the IN DIG1 digital input remains enabled. When the <!> characters disap-pear, the device restarts working with the group of settings displayed.

6.1.4 Display main settings

a) Press

ò

or

ñ

[SETTINGS READING] [ MAIN ]

b) By pressing ð, the main settings display sub-menu is entered, by pressing

ò

or

ñ

the following sub-menu is scrolled:

rated frequency fn

direct rated voltage setting range (**) S..

direct rated voltage Un

first underresistance threshold R< starting signalling delay R< tstart

trip delay R< t1

second underresistance threshold R<< starting signalling delay R<< tstart

trip delay R<< t2

alternating overcurrent threshold I~> starting signalling delay I~> tstart

trip delay I~> t3

first direct undervoltage threshold U-<

U-< starting signalling delay tstart

trip delay U-< t4

second direct undervoltage threshold U-<<

U-<< starting signalling delay tstart

trip delay U-<< t5

first direct overvoltage threshold U->

U-> starting signalling delay tstart

(16)

second direct overvoltage threshold U->> U->> starting signalling delay tstart

trip delay U->> t7

additional timer t_X1

min. pulse width of end relays t_IMP (**) the settings range relies on jumper S20, S21, S22 or S23 which are closed as follows:

jumper closed setting range

S20 30.00 - 300.00 V

S21 3.00 - 30.00 V

S22 0.30 - 3.00 V

S23 0.03 - 0.30 V

c) By pressing ï,anywhere in the sub-menu, you will go back to the main viewing menu:

[SETTINGS READING] [MAIN ]

6.1.5 Viewing spare settings

a) Press

ò

or

ñ

until the display unit shows:

[SETTINGS READING] [SPARE ]

b)Press the key ð to enter the spare setting viewing menu, then press

ò

or

ñ

to scroll across the whole submenu that lists: first underresistance threshold R< starting signalling delay R< tstart

trip delay R< t1

second underresistance threshold R<< starting signalling delay R<< tstart

trip delay R<< t2

alternating overcurrent threshold I~> starting signalling delay I~> tstart

trip delay I~> t3

first direct undervoltage threshold U-< starting signalling delay U-< tstart

trip delay U-< t4

second direct undervoltage threshold U-<< starting signalling delay U-<< tstart

trip delay U-<< t5

first direct overvoltage threshold U-> starting signalling delay U-> tstart

trip delay U-> t6

second direct overvoltage threshold U->> starting signalling delay U->> tstart

trip delay U->> t7

Those parameters that are not present in the SPARE menu take the same values as the MAIN settings.

c) By pressing the key ï anywhere in the sub-menu, you go back to the main reading menu:

[SETTINGS READING] [ SPARE ]

6.1.6 Display current and stored measured values

b) By pressing the key ð you will enter the measurement display menu, and by pressing the key

ò

or

ñ

the following sub-menu will be scrolled across:

present resistance value in Ohm R(*) present direct voltage in Un U-present injected alternating voltage value in Volt U~

present injected alternating current in Ampere I~

injected overcurrent value in Ampere I~MAX c) By pressing RESET you may cancel the maximum stored values being displayed.

By pressing the key ï anywhere in the submenu, you will go back to the main reading menu:

[ MEASUREMENTS ] [ ]

(*) When resistance cannot be measured, the symbol ---- will be displayed; when resistance exceeds 6500 Ohm, the sym-bol >6500 Ω will be displayed.

6.1.7 Viewing counters

a) Press the key

ò

or

ñ

b) By pressing ð you enter the sub-menu that displays the allocation of the auxiliary output relays. The display shows:

[REL X12345] [ON ↑↑↑↑↑]

which stands for the enabling by normal energizing (↑) or de-energizing (↓) of each relay.

Press

ò

to scroll across the whole submenu, the display unit will show:

[R< START] [REL X..3.5]

the first line displays the function that is associated with the relay or relays listed in the second line.

By pressing the keys

ò

or

ñ

the sub-menu is scrolled across. The functions that can be associated with the output relays are: delayed start of first underresistance threshold R< START first underresistance threshold trip R< TRIP delayed start of sec. underresistance threshold R<< START second underresistance threshold trip R<< TRIP delayed start of injected overcurrent threshold I~> START alternating overcurrent threshold trip I~> TRIP undervoltage (diagnostics) threshold trip U~< TRIP overvoltage (diagnostics) threshold trip U~> TRIP delayed start of first direct undervoltage thresholdU-< START first direct undervoltage threshold trip U-< TRIP delayed start of sec. direct undervoltage thresholdU-<< START sec. direct undervoltage threshold trip U-<< TRIP delayed start of first direct overvoltage threshold U-> START first direct overvoltage threshold trip U-> TRIP delayed start of sec. direct overvoltage thresholdU->> START direct overvoltage threshold trip U->> TRIP

timer tX1 overtime t_X1 TRIP

first digital input fed IN DIG 1 second digital input fed IN DIG 2 third digital input fed IN DIG 3 It is furthermore possible to display the output relays that bear the following settings:

minimum pulse width t_IMP

bistable operation MEMOR

the sub-menu is scrolled. The functions that may be associated with the inputs are: first underresistance threshold trip lock BLOC. R<

second underresistance threshold trip lock BLOC. R<< overcurrent threshold trip lock BLOC. I~> undervoltage threshold trip lock BLOC. u~< overvoltage threshold trip lock BLOC. u~> first direct undervoltage threshold trip lock BLOC. U-< second direct undervoltage threshold trip lock BLOC. U-<< first direct overvoltage threshold trip lock BLOC. U-> second direct overvoltage threshold trip lock BLOC. U->>

timer tX1 start t_X1

Switching to spare settings SETTINGS SWITCH LED's and output relays reset RESET c) By pressing the key ï anywhere in the sub-menu, you go back to the main reading menu:

[ DIGITAL ] [ INPUTS ]

6.1.11 Display LED's

a) Press the key

ò

or

ñ

until the following message appears on the display:

[ LED ] [ ]

(18)

b) By pressing the key ð you enter the sub-menu that displays the LED allocation. The following messages will be displayed:

[I> START] [LED L..3..6.8]

the first line displays the function that is associated with the LED's listed in the second line.

ò

or

ñ

, the sub-menu is vertically scrolled. The functions that can be associated with the LED's are: delayed start of first underresistance threshold R< START first underresistance threshold trip R< TRIP delayed start of sec. underresistance threshold R<< START second underresistance threshold trip R<< TRIP delayed start of injected overcurrent threshold I~> START alternating overcurrent threshold trip I~> TRIP undervoltage (diagnostics) threshold trip U~< TRIP overvoltage (diagnostics) threshold trip U~> TRIP delayed start of first direct undervoltage thresholdU-< START first direct undervoltage threshold trip U-< TRIP delayed start of sec. direct undervoltage thresholdU-<< START sec. direct undervoltage threshold trip U-<< TRIP delayed start of first direct overvoltage threshold U-> START first direct overvoltage threshold trip U-> TRIP delayed start of sec. direct overvoltage thresholdU->> START direct overvoltage threshold trip U->> TRIP

first digital input fed IN DIG 1 second digital input fed IN DIG 2 third digital input fed IN DIG 3 It is furthermore possible to display the LED's that bear the following settings:

bistable operation MEMOR

[ LED ] [ ]

6.1.12 Viewing relay data

a) Press ò or ñ until the display shows:

[ RELAY DATA ] [ ]

b) By pressing the key ð you enter a sub-menu where the protection model and the software release are displayed:

[MX3IPG2A ] [Soft Rel. 1.00]

ò

once again, the second line will display the alphanumeric identification code that the user gave to the device, for instance:

[PLANT IDENTIFIER] [CELL No. 17bis ]

d) By pressing the key ï anywhere in the sub-menu, you go back to the main reading menu:

[ RELAY DATA ] [ ]

6.1.13 Diagnostic display

1) Fault location

a) Press the key ò or ñ until the following message is displayed:

[ DIAGNOSTIC ] [ ]

In the presence of VITAL FAULTS, the device automatically displays the window, without needing to enter the diagnostic menu.

b) By pressing the key ð you enter a sub-menu that displays the operating state of the relay. The display will show:

[LAST SETTING ] [DD/MM/YY hh:mm]

the second line displays the day, the month, the year, the time and the minutes of the time when last change was made to the settings.

ò

once again, if the device has not detected any failure, the following message will be displayed:

[ RUNNING ] [ ]

If NON-VITAL FAULTS are detected, the following message will be displayed:

[FAULT ] [ABCDE...KL ]

whereas, if VITAL FAULTS are detected, the <!> characters will be displayed, too:

[FAULT <!>] [...FGHIJ... ]

The second line displays one or more fault identification codes.

The following table provides the fault codes and the corre-sponding fault description:

Code fault description

A X1 relay coil interrupted or related driver B X2 relay coil interrupted or related driver C X3 relay coil interrupted or related driver D X4 relay coil interrupted or related driver E X5 relay coil interrupted or related driver F internal feeder failure

G EEPROM failure

H Internal RAM failure I External RAM failure

J Analogue to Digital converter

K communication board failure or enabled but not configured

L internal clock failure

If jumper S6 (see fig.2) that enables the communication board is connected when the board is not present, the K code shows up, as if a failure were detected in the board.

d) As far as the NON-VITAL FAULTS are concerned, by pressing

(19)

whereas, as regards the VITAL FAULTS, you can only leave the diagnostic sub-menu, if the device allows you to do that, by entering the “settings change” menu.

2) Inhibited device

The condition of “inhibited device” is displayed as follows:

[FAULT <!>] [...P ]

This condition can only be reset by entering the "settings change“ menu (it is however necessary to confirm when you are prompted to SAVE CHANGES, although no setting has been changed).

Warning: even simply view the set parameters from the “settings change” menu, since upon leaving this condition, the device will not be inhibited any longer.

If, beside inhibiting the device, you have also deconfigured it, the return to operation causes a fault K message to be displayed until the unit is configured anew (see paragraph 4.14).

6.2 MAIN SETTING CHANGE MENU

By pressing the key anywhere in the display menus for at least 2s, the main settings change menu is entered. Thence, several sub-menus can be entered (tree- structure). When the settings change function is enabled, the green LED (RUN) lights up blinking.

If the settings change menu is already acceded through a PC or a network, any local change is inhibited, and the following message will be displayed:

[SETTINGS CHANGE] [NOT AVAILABLE ]

The access priority to the changing function among PC, net-work and keyboard is time-dependent.

During the settings change operations, the device continues working with the old settings.

All the displays can be made permanent.

[NEW SET.CONFIRM?] [< NO YES >]

By pressing ï all the changes made are discarded, whereas by pressing ð the changes made are confirmed.

The green LED (RUN) stops blinking and becomes perma-nent.

If upon confirming the changes, a fault is detected, the settings are not accepted as long as the fault event persists. This state is signalled for 3s by the following message:

[SETTINGS CHANGE] [DELAYED ]

once the event is over, you are prompted to confirm the changes made again.

If the transfer is interrupted is due to a digital input being enabled which cannot be disabled at the moment and you need to change the settings, the device must be inhibited; after that, you can start changing the settings (see paragraphs 4.14 and 6.1.13).

Note: the “change settings” function can even be implemented when the device is “forced” to use the SPARE SETTINGS. In such a case, the system only interrupts the selection of SETTINGS IN USE: MAIN until the external forcing signal disappears. If a setting is changed when the system is “forced” from the outside, the following message is displayed:

[SPARE SETTINGS] [FROM EXT.CONTROL]

All the following examples take their start from the main settings change menu.

6.2.1 Select current settings group

a) Press the key ò or ñ until the following message is dis-played:

b) After pressing the key ð, the current settings can start being changed. The following message is displayed:

c) By pressing ò or ñ, the following message is displayed:

[SETTINGS IN USE:] [ SPARE]

(20)

d) By pressing the key ï the new selection is confirmed, and the system goes back to the main settings change menu. The following message is displayed:

[SETTINGS IN USE:] [ SPARE]

6.2.2 Change main settings

a) Press the key

ò

or

ñ

until the following message is displayed:

[SETTINGS CHANGE] [MAIN ]

b) By pressing the key ð , you enter the main settings change sub-menu, which contains all the parameters already listed in § 6.1.3.

c) By pressing the keys

ò

or

ñ

, you can vertically scroll the sub-menu, and by pressing the key ð you can start changing the displayed parameter. The change can be made by pressing the keys

ò

or

ñ

.

d) By repeatedly pressing the key ï anywhere in the sub-menu, you go back to the main changing menu:

Example of setting

Let us suppose we need to enable and set the rotor ground threshold R< to 1015 Ohm starting from an initial setting of 990, OFF.

Go through steps a) and b)

Press

ò

or

ñ

until the threshold to be changed is selected on display:

[R< OFF] [R< 0990 Ω ]

Press ð to start changing the selected setting I>>>,the display unit will show:

[R< OFF] [R< 0990 Ω ]

Press

ò

or

ñ

to set it ON and the display will show:

[R< ON ] [R< 0990 Ω ]

Press ï to move back to the beginning of the line. Thus, by pressing

ò

, you may move to the second line.

Press ð to select the digit to be changed.

In our case, by pressing 4 times the key ð, the display unit will show:

[R< ON ] [R< 0990 Ω ]

Press ñ to increase the selected numberuntil the value re-quired by our example is reached:

[R< ON ] [R< 0995 Ω ]

Now, by pressing ï you select the third digit making up the setting, the display unit will show:

[R< ON ]

By pressing ñ the digit is changed (on reaching number 9 the units will increase by 1) until the display unit shows:

[R< ON ] [R< 1015 Ω ]

Press ï to move back to the beginning of the line and go back to the main editing menu:

Warning:

In the event of the direct rated voltage setting range being changed, please remember to move the internal jumper (S20....S23) as follows:

jumper closed setting range

S20 30.00 - 300.00 V

S21 3.00 - 30.00 V

S22 0.30 - 3.00 V

S23 0.03 - 0.30 V

The movement of the jumper causes the setting to be changed, as the latter is multiplied times 10d_{where d is the distance}

between the old and the new jumper, for instance: old setting jumper S20 setting range 30-300 V set Un 165 V new setting jumper S23 setting range 0.03-0.30 V set Un 165 x 10(20-23)_{= 0.16 V}

6.2.3 Change spare settings

6.2.4 Set output relays

Consider we need to allocated the trip of the overcurrent threshold R< to output relay X5 starting from an initial setting of R< allocated to X2

Go through steps a) and b) until the display unit shows:

[R< TRIP] [REL X.2...]

Each position after letter X is an output relay. More relays may be allocated to one function.

Press ð to move to the relay you wish to associate.

In our case, by pressing the key ð five times, the display unit will show:

[R< TRIP] [REL X.2...]

By pressing

ò

or

ñ

the selected relay X5 is dissociated and the display unit will show:

the sub-menu is vertically scrolled, and by pressing the key ð, you can start changing the selected parameter. The change can be made by pressing the key

ò

or

ñ

.

To switch from the main settings to the backup settings, the digital input number 1 (IN DIG 1) must be used

SETTINGS SWITCH To reset the LEDs and the auxiliary relays, the digital input number 3 (IN DIG 3) must be used.

RESET(LED+Xmem) The setting procedure mirrors that described in the example of output relay configuration.

d) By pressing the key ï anywhere in the sub-menu, you go back to the main changing menu:

[ DIGITAL INPUT ] [ ]

6.2.6 LED Settings

a) Press the key

ò

or

ñ

[ LED ] [ ]

b) By pressing the key ð , the LED setting sub-menu, which contains the parameters already listed in § 6.1.10., is entered. c) By pressing the key

ò

or

ñ

the sub-menu is vertically scrolled, and by pressing the key ð, you can start changing the displayed parameter. The change can be made by press-ing the key

ò

or

ñ

.

The setting procedure mirrors that described in the example of output relays setting.

d) By pressing the key ï anywhere in the sub-menu , you go back to the main changing menu:

[ LED ] [ ]

6.2.7 Set alphanumeric code

a) Press the key ò or ñ until the display shows:

[ RELAY DATA ] [ ]

b) By pressing the key ð, you can change/set an alphanumeric code that identifies the device. The display will show, for instance:

[PLANT IDENTIFIER] [CELL N. 17bis ]

c) By further pressing the key ð you select the character(s) to be changed, and by pressing ò or ñ all the capital and small letters of the alphabet, all the numbers and some special characters, among which the blank space, are vertically scrolled. d) By pressing the key ï, the cursor moves back to the beginning of the line (no character selected), and by further pressing the key ï , you go back to the main changing menu:

[ RELAY DATA ] [ ]

(22)

6.2.8 LCD back-lighting

a) Press the key

ò

or

ñ

[ LCD ] [AUTOMATIC RETURN]

b) By pressing the key ð, you can set the LCD back-lighting to permanent (OFF) or timed (ON). Let us assume the display shows:

[ ON ] [ ]

ò

or

ñ

, the current setting can be changed:

[ OFF] [ ]

d) By pressing the key ï, you go back to the main changing menu:

[ LCD ] [AUTOMATIC RETURN]

6.3 TEST MENU

By pressing the keys for at least 2s anywhere in the main reading menus, the TEST function, which is highlighted by the blinking of the green LED (RUN), is enabled.

[TEST LED]

[ YES >] ð TEST LED’s L1-L8 and display

ñ ò

[TEST RELAY X1]

[ YES >] ð TEST relay X1

ñ ò

[TEST RELAY X2]

ñ ò

[TEST RELAY X3]

ñ ò

[TEST RELAY X4]

ñ ò

[TEST RELAY X5]

The test to be carried out on the auxiliary relay X.. makes the latter trip, so that the associated command and/or signal can be sent. That is why, before running it, the systems prompts you to further confirm its execution:

[ ARE YOU SURE? ] [< NO YES >]

If, upon confirming the execution, some starting or tripping commands are already present or a digital input combined with a timer proves to be enabled, the test is not performed, and this condition is signalled by the following message:

[TEST ] [NOT AVAILABLE ]

The LED and display test makes them light up for two seconds.

By pressing the two keys for two seconds anywhere in the test menu, the TEST function is disabled. The green LED (RUN) stops blinking, and the system goes back to the main display menu.

(23)

7. APPLICATION AND USE

The device is suitable to detect the ground rotor faults for synchronous machines.

It is also suitable to monitor direct voltage (Vaux)

8. INSTALLATION - TRANSPORT

8.1 ESD Electrostatic charges

The relay uses electronic components that are highly sensitive to electrostatic charges. Therefore, the operator who happens to handle the moving part of the equipment and come in contact with the electronic circuits, must take preventive measures to avoid damaging the relay:

- before removing the movable part, the operator must reach the same potential as the equipment by touching the case - avoid touching electronic components, printed circuit boards and connectors, as far as this is possible. Handle it by using the mechanical frame.

- lay the device on surfaces that are antistatic or feature the same potential as the operator's.

- only store and transport the relay by using the special antistatic bag.

Special electronic devices require the operator and the unit to be both grounded along with any measuring instrument, when this is possible.

As far as the following action is possible and reasonable, do not pull out the moving part from the casing to avoid causing mechanical and electrostatic damages to the protection.

8.2 Acceptance - storage

Although protective relays are generally of robust construction, they require a careful treatment prior to installation on site, since they must be carefully packed and unpacked, without applying any force and using suitable tools.

Once supplied, the relays must be thoroughly inspected to ensure that they have not undergone shipping damages. If the relays are not immediately installed upon reception, they must be stored in places free from dust and moisture, in their original packing.

Storage temperature: -25°C + 80°C.

8.3 Assembling and connection

- Remove the protective cover until the four fastening holes become visible.

- Place the equipment into the hole of the panel-board and secure it by fastening the four screws (see fig. 6)

- Connect the ground screw of the equipment to the protection ground of the panel-board using connectors of suitable gauge (>4mm2) and as short as possible (<1m).

- The connections must be made through the screw or Faston connections of the interface terminal blocks. In the event of Faston wiring, the cover that provides the terminal block with the IP20 protection class must be placed before the Faston is connected to the relay. In the event of screw wiring, the side fins of the IP20 cover that correspond to the wired terminals must be removed or folded.

The assembling and wiring must be carried out according to the best workmanship.

Mx3IPG2A

MX3IPG2A

Multiple-Function Protection for Generator

(R< - Ucc< - Ucc>)

TECHNICAL MANUAL

MDE/C133 2561 001

CONTENTS

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