Liebert 1000kVA manual SCC Monitor/Mimic Display Screen, Input Metering Displays

Operation

•Battery Test (MMU Only)—The optional battery test screen allows the operator to perform manual battery tests to determine the general condition of the battery system. The results of the last 10 tests are recorded in non-volatile storage and can be retrieved through the battery test results screen.

•Battery Temp Compensation Charging (MMU Only)—The optional battery temperature sensing unit, when installed, automatically reduces the float charge voltage in response to increases in battery temperature. The nominal float voltage is 540VDC (2.25 volts per cell) at 25°C. This float voltage is automatically reduced 5VDC for each temperature rise of 5°C. The LCD indicates whether the temperature compensation circuit is active.

3.2.2SCC Monitor/Mimic Display Screen

From SCC Master Menu move the highlighted cursor to MONITOR/MIMIC DISPLAY. Press the Select pad and the Monitor/Mimic screen is displayed.

The Monitor/Mimic display screen is a simplified block diagram of the UPS system. This screen gives the operator an overall view of the power flow through the UPS system. The screen consists of three major sections: the input/UPS metering section, the load metering section and the status and alarm message areas. The metered parameter values on the Monitor/Mimic screen are updated at one-sec- ond intervals.

Figure 14 SCC Monitor/Mimic display screen

1

BYPASS INPUT

A-B B-C C-A 480V 480V 480V 60.0 Hz

2

UPS INPUT PWR A-B B-C C-A 480V 480V 480V

5

MOD 1 ON LINE

MOD 2 ON LINE

MOD 3 ON LINE

© 1989-2003

UPS RATINGS

SCCB 1600

OUTPUT VOLTAGE A-B B-C C-A

480V 480V 480V

60.0 Hz

OK to Transfer

Static Switch Connected

4

3

67

LOAD

627 KVA / 502 KW

A B C 755A 755A 755A

3 OF 3 MODULES

CONNECTED

REDUNDANT

Input Metering Displays

NOTE

All voltage readings are phase-to-phase measurements (A-B, B-C and C-A). All current readings are phase measurements (A, B and C).

Item 1 - Bypass Input: This block displays the bypass input voltage and the bypass input frequency. The System Bypass Breaker is shown to the right of this block. The status of the circuit breaker is illustrated as open or closed.

Item 2 - UPS Input Pwr: This block displays the input voltage to the UPS modules. This data is received serially from the modules.

Output Metering Displays

Item 3 - UPS Ratings: The SCC current rating is specified at the top of this block. The UPS system output voltage and frequency are also displayed in this block. The UPS Output Breaker is shown to the right of this block. The status of the circuit breaker is illustrated as open or closed.

Item 4 - Load: This block displays the total output power to the critical load in kVA and kW. The critical load current per phase is also displayed in this block. Note that kW is not displayed when the load is on the bypass line.

The load block also indicates the number of modules connected and whether the UPS system is oper- ating in the redundant or non-redundant mode.

During an overload condition, the time remaining before shutdown or transfer is displayed at the bot- tom of the load box.

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