Liebert 1000kVA - Manual (Page 69)

Operation
63
3.2.14 Alarm and Status Messages
Module Status Messages
The module status messages indicate how many UPS modules are included in the system and the
present status of each module.
The following status messages may appear in the module status area.
1. MOD N: A module status message line is displayed for each UPS module in the system. Up to six
(6) modules may be included in a multi-module system. The N in the message will indicate a
specific UPS module number, 1 through 6.
2. ON LINE: The UPS module output circuit breaker is closed and power from the module is available
to the SCC. The module output is sharing the critical load if the UPS Output Breaker is closed.
3. OFF-LINE: The UPS module output circuit breaker is open. More specific alarm messages are
displayed at the UPS module.
4. SUM ALM: The Module Summary Alarm has been activated by one of the alarm messages listed
in two tables — SCC and module remote monitor indications and Other alarms that
activate summary alarms — in 3.2.6 - System Configuration Screens. The specific alarm
message is displayed at the UPS module.
5. COM FAIL: The UPS module is not communicating with the SCC. This could mean loss of power
to the UPS module controls, a disconnected cable or a control logic failure (detected by watchdog
timer. Call Liebert Global Services if you require assistance. To resume communication after
control power is restored, sequence display to Master Menu.
Figure 51 SCC status and alarm message areas
System Status Messages
The system status messages indicate whether the static bypass switch is connected or disconnected,
through the manually operated Static Switch Disconnects (see Figure 9). The status messages
also advise the operator when a transfer or retransfer between the UPS system and bypass line is per-
mitted, based on matching voltage, frequency and phase.
The following status messages may appear in the system status area.
1. Static Switch Connected: The static switch is connected (the disconnect switches are closed—
ON) and is ready to provide a current path from the bypass input to the load.
2. Static Switch Disconnected: The static switch is disconnected (the disconnect switches are
open—OFF) for maintenance procedures.
3. OK to Transfer: The UPS system voltage, frequency and phase match the bypass line. This
means that a transfer between the bypass line and the UPS system is permitted.
4. Not OK to Transfer: Either the UPS or bypass voltage, frequency or phase is not within the
specified limits or the static bypass switch is not available. Therefore, manually initiated transfer
between the bypass line and the UPS system is not permitted. Emergency or overload transfer to
bypass may still be available provided the “Static Switch Unable” alarm is not indicating.
UPS RATINGS
LOAD
Byp Not Avail
Static Sw Unable
Module Sum Alm
UPS INPUT PWR
BYPASS INPUT
A-B B-C C-A
0V 0V 0V
0 Hz
0V 0V 0V
A-B B-C C-A
Not OK to Transfer
Static Switch Connected
MOD 1 ON LINE SUM ALM
MOD 2 ON LINE SUM ALM
MOD 3 ON LINE SUM ALM
A-B B-C C-A
480V 480V 480V
60.0 Hz
SCCT 1600
OUTPUT VOLTAGE
627 KVA / 502 KW
755A 755A 755A
3 OF 3 MODULES
CONNECTED
REDUNDANT
A B C
Time To Overload
Transfer: XXXX SEC
LOAD BLOCK
MESSAGES
ALARM
MESSAGES
MODULE STATUS
MESSAGES
SYSTEM STATUS
MESSAGES
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