LANGUAGE SELECTION Selects the language required for the LCD LEVEL OF REDUNDANCY Defines the level of redundancy N+X
OUTPUT VOLTAGE Sets the nominal voltage of the output voltage OUTPUT FREQUENCY Sets the value of the output frequency
CONVERTER Sets the mode of the frequency converter BATTERY TYPE
Indicates the type of batteries used:
9 Hermetically sealed lead VRLA (AGM or GEL) 9 Open vase
9 Nickel Cadmium
BATTERY CAPACITY Sets the nominal battery capacity in Ah
NUMBER OF ELEMENTS Indicates the number of elements in series on each string PRE MINIMUM BATTERY VOLTAGE Voltage value at which the pre minimum battery alarm signal is
activated
MINIMUM BATTERY VOLTAGE Voltage value at which the UPS shuts down due to minimum battery voltage
BATTERY RECHARGE
MAINTENANCE VOLTAGE Indicates the maintenance voltage value per individual cell BATTERY RECHARGE
CURRENT LIMIT Indicates the recharge current limit as a percentage of the nominal capacity set
BATTERY RECHARGE ACCORDING
TO TEMPERATURE Sets the compensation value of the recharge voltage according to the battery temperature
FREQUENCY OF BATTERY TEST Sets the interval in days for the automatic execution of the battery test
RS232 SERIAL CONNECTION Sets the serial communication parameters and enables/disables the remote commands.
DATE AND TIME Sets the date and time for event history log functions LCD CONTRAST Sets the contrast for the GRAPHIC LCD display FREQUENCY OF STATISTICAL
FUNCTIONS Sets the sampling time intervals for monitoring of events / measurements
MASTERYS 5.5 System concentrator: (ICM2)
In the parallel configuration (horizontal parallel), each module comes with a graphic LCD display with ICM function. This means that the individual units and the whole system hierarchically can be seen and controlled on all displays.
The advantages of the Intelligent Communication Module functionality are that a single UPS can house a selection of options and the external communication accessories needed for the monitoring and diagnostics for the whole system (NetVision, GSS or ADC Board, etc.); information on the system, including the unified Ethernet connection, is therefore remotable and made available centrally.
This functionality is already implicitly present in the e-Business solution which starts out as a single modular system with a single ICM graphic display.
The ICM functionalities are linked exclusively to display and communication, without any interaction with the parallel control electronics, to ensure there is no single point of failure.
MASTERYS™: Intelligent Communication Module Panel visualisation
MASTERYS
MASTERYS™: Intelligent Communication Module Panel visualisation
MASTERYS
6. Technology
6.1 VFI: Voltage Frequency Independent
The main purpose of the Uninterruptible Power System (UPS) is to provide an autonomous power supply to the connected equipment to that operation of the equipment is not affected by random alterations and/or short extended failures of the mains power supply.
A special feature of MASTERYS™ is the “ONLINE” double conversion operation (VFI-SS-111 as defined by the new reference standard EN 62040-3), that is, the capacity to supply a voltage that is perfectly stabilized in frequency and amplitude, even in event of extreme alterations in the mains power supply.
The table below shows the UPS classification procedures and parameters in accordance with EN 62040-3
V F I S S A B C
Output characteristics Only in normal operating mode
Waveform in output First character:
normal mode or from by-pass Second character:
mode from battery
Dynamic performance in output A In conditions of change of operating mode
B In conditions of variation of the linear load
C In conditions of variation of the non linear reference load
Classification option Classification option Classification option VFI When the UPS output is
independent of the variations in (mains) power supply voltage and frequency
S The waveform generated is sinusoidal, with total harmonic distortion rate D < 0.08 and harmonics within the limits indicated in EN 61000-2-2 in all conditions of linear/ non linear reference load
1 < Class 1
(no interruption or zero voltage) 2 < Class 2
(zero in output for 1ms)
VFD When the UPS output is dependent on the variations in voltage and frequency
X Like “S” with linear load, D < 0.08 with distorting load
3 < Class 3
(zero in output for 10ms) 4 Refer to the manufacturer
VI When only the output frequency depends on the variations in (mains) power supply frequency
Y The waveform generated is not sinusoidal and exceeds the limits indicated in EN 61000-2-2. (Refer to the manufacturer for the type of waveform)
MASTERYS
6.2 Description of the functional blocks
With reference to the block diagram shown below, the individual blocks have the following functions:
(1) RECTIFIER
When the mains power supply is present, the function of the rectifier is to convert the input alternating voltage into a direct voltage (AC/DC converter) for the supply of the inverter stage.
Working directly with the mains voltage, it has power factor correction (PFC > 0.99), and input current harmonic distortion control (THDi < 3%); these are important in order to ensure that other applications powered on the same distribution line are not affected.
The same functional block is also used as a DC/DC converter during operation from battery. It supplies a constant direct power supply inverter voltage and at the same time ensures protection against deep discharges of the accumulator batteries used.
(2 )BATTERY
This is the energy source for the inverter power supply if the main power supply fails, in order to ensure there is no break in the supply of power to the applications.
The main types of batteries used for these purposes are maintenance-free hermetically sealed lead, open vase and nickel-cadmium batteries.
(3) INVERTER
This converts the direct voltage supplied by the rectifier stage into a sinusoidal voltage that is fully stabilized in amplitude and frequency
(4) AUTOMATIC BY-PASS
This device transfers the UPS output onto the auxiliary mains in the event of an overload or a fault in the inverter section.
The mains by-pass circuit is produced using thyristors and so intervention time is zero.
(1) (2)
(3)
(2)
(4)
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7. Modes of operation
7.1 Operating modes and conditions
On line operation
A special feature of the MASTERYS™ series is the "ON LINE" double conversion operation in conjunction with mains absorption with very low distortion.
With ON LINE mode, the UPS is able to supply a voltage that is fully stabilized in frequency and amplitude, regardless of any interference in the mains power supply within the most stringent classification of UPS regulations.
ON LINE operation provides three operating modes according to mains and load conditions:
"Normal" mode
This is the most frequent operating condition: the energy is drawn from the primary mains power supply and is converted and used by the inverter to generate the output voltage to power the connected applications.
The inverter is constantly synchronized in frequency with the back-up power supply so that the load can be transferred to it (due to an overload or inverter stoppage) without any break in the power supply to the load.
The battery charger supplies the energy required to maintain or recharge the accumulator batteries.
"By-pass" mode
If the inverter should stop, the application is automatically transferred, without any interruption in power, onto the stand-by mains.
This procedure may occur in the following situations:
• in the event of a temporary overload; the inverter continues to power the load. If the condition persists, the inverter goes into protection mode and the UPS output is switched via the automatic by-pass onto the stand-by mains line. Normal operation, that is from inverter, returns automatically a few seconds after the overload disappears.
• when the voltage generated by the inverter goes out of the allowed limits of tolerance due to a major overload or because of a fault on the inverter.
• when the internal temperature exceeds the maximum allowed value.
"Battery" mode
In the event of a mains failure (micro interruptions or extended black-outs), the UPS continues to power the application using the energy stored in the accumulator battery.
The Expert Battery System keeps the user constantly informed on the battery status and on the back-up time available.
The disconnection of non-privileged applications during battery discharge can be programmed (after a certain amount of time has passed) by using the Power Share option so that the battery resources can be reserved for the most critical applications.
Operation in economy mode
The UPS has a selectable and programmable “economy” operating mode that can increase overall efficiency by up to 98%, for energy saving purposes. With this mode of operation, specific daily or weekly time intervals can be selected and programmed in which the applications are powered directly from the back-up power supply. If the supply fails, the UPS will automatically switch onto the inverter and continue to supply power to the load by drawing energy from the battery.
This mode does not provide perfect stability in frequency and voltage, which is a property of ON LINE operation, thus the use of this mode should be carefully evaluated according to the level of protection required by the application.
MASTERYS
Always On Operating Mode
Very high efficiency can be achieved with the innovative Always On mode in conjunction with active filtering of the harmonics reflected in the mains by the distorting load.
In normal conditions the application is powered directly from the stand-by mains via the automatic bypass, while the inverter contributes towards compensating the reflected harmonics.