Operation
Alarm Messages
The alarm message area displays vital information about the operation of the UPS system. During normal operation no alarm messages should be present. Alarm conditions can be monitored. The alarm messages are displayed in reverse video (highlighted— light on dark). To clear a latching alarm, you must also press the Alarm Reset pad after the alarm condition is corrected.
The following list shows the alarm messages that may be displayed in this area. For more information and the corrective actions for these messages, refer to Table 9 in this section.
Item 5 - Alarm Messages
Input Fail | Reverse Power |
DC Ground Fault | Rectifier Fuse Blown |
DC Capacitor Fuse Blown | Inverter Fault |
Battery CB Open | Hardware Shutdown |
Battery Discharging | Emergency Off |
Low Battery Warning | Ambient Overtemperature |
Low Battery Shutdown | Fan/Blower Failed |
DC Overvoltage Shutdown | Equipment Overtemperature |
Input Current Unbalanced | Overtemperature Timeout |
Control Power Fail | Battery Cycle Buffer Warning |
Inverter | Battery Overtemperature |
Overload | Battery Exercise |
Overload Shutdown |
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Figures 16 through 20 illustrate how the Monitor/Mimic Display screens on the SCC and on a mod- ule depict the power flow through the UPS system.
A three-module system designed for redundant operation is shown. A multi-module UPS system may include up to six (6) modules for each System Control Cabinet (SCC).
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