Operation
Table 4 | Alarm messages and corrective actions | |||
Alarm |
| Special |
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Message |
| Functions | Meaning and Corrective Action | |
AC INPUT |
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| The rectifier input line voltage is outside of specified limits or the input circuit breaker is | |
Input fail |
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| opened while the battery circuit breaker remains closed. The battery supplies power to the | |
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| critical load through the UPS inverter. Provide an alternate source of AC power or prepare to | ||
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| ||
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| initiate critical load procedures when battery reserve time is low. | |
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DC BUS |
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DC Ground |
| D, L, S | Either the positive (+) or negative | |
| Contact Liebert Global Services | |||
Fault |
| |||
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| the fault. | ||
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| |
DC Capacitor |
| D, F, S | At least one DC capacitor fuse has opened. The UPS module is shut down and isolated. | |
Fuse Blown |
| Contact Liebert Global Services at once. Do not attempt to reset the circuit breakers. | ||
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| |||
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| The module battery circuit breaker (MBD) is open. This circuit breaker can be opened either | |
Battery CB |
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| manually or automatically in a UPS shutdown procedure. If the UPS is operating with this | |
| D, S | breaker open, the critical load is not protected from loss of the utility source power. | ||
Open |
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| After AC power is restored and the DC bus is at 100% operating voltage, manually close the | ||
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| battery circuit breaker so the rectifier can charge the battery. | |
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| |
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| The battery is discharging. This occurs whenever the battery supplies power to the load for | |
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| more than 5 seconds because of input power failure, a rectifier problem or an overload | |
Battery |
| D, R, S | condition. If the input power or a source of auxiliary power is restored to the UPS module, | |
Discharging |
| the UPS automatically returns to normal operation. Watch the battery voltage carefully. | ||
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| |||
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| Reduce the load (begin controlled shutdown) to extend the battery | |
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| UPS alarms after the input power is restored. The message clears after 30 seconds. | |
Low Battery |
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| The battery voltage is approaching the minimum discharge voltage (approximately | |
| D, R, S | 5 minutes remaining). Complete the controlled shutdown of the critical load. Reset the | ||
Warning |
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| alarms if the input power is restored before shutdown. | ||
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| |
Low Battery |
| D, F, | The battery voltage has decreased to the minimum discharge value. The UPS module shuts | |
| down (no power to the critical load) and the battery and input circuit breakers trip open. | |||
Shutdown |
| L, S | ||
| Perform a UPS system | |||
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Battery Over |
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| The measured battery temperature exceeds the | |
Temperature |
| D, S | 1 minute. Alarm automatically clears when temperature falls below the limit for more than | |
(Optional) |
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| 1 minute. Determine the overtemperature cause. | |
Battery |
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| The UPS rectifier/charger is reducing the battery float voltage setpoint to compensate for | |
Charge |
| S | elevated battery temperature. The UPS automatically reverts to normal operation when | |
Compensation | temperature returns below the limit. | |||
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(Optional) |
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DC |
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| The maximum preset value of the DC Bus voltage has been exceeded. The UPS transfers | |
| D, F, | to bypass and the input and battery circuit breakers trip open. Contact Liebert Global | ||
Overvoltage |
| |||
| L, S | Services at once. A fault may have occurred within the UPS. Do not attempt to reset the | ||
Shutdown |
| |||
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| circuit breaker. | ||
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| |
BYPASS |
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Load On |
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| The critical load is being supplied power from the bypass line and is therefore exposed to | |
| D, R | utility power disturbances. Clear all of the alarms before attempting to retransfer the load | ||
Bypass |
| |||
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| from the bypass line to the UPS. | ||
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Auto Transfer | D, E, F | The critical load has been automatically transferred to the bypass line. Use the History | ||
Status screen to determine the cause for the transfer. Clear all of the alarms before | ||||
to Bypass |
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| attempting to retransfer the load from bypass to UPS. | ||
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Auto |
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| An automatic retransfer will be initiated when the OK to Transfer condition has been present | |
Retransfer |
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| for 10 seconds, if the overload has dropped below 100% of the rated load | |
Primed |
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| |
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| A manual retransfer is required. Either an overload condition has lasted more than | |
Manual Reset/ |
| 5 minutes or no more | ||
Retransfer |
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| used if | |
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| conditions are present. | |
D = |
| L = latches |
| |
E = logs only |
| R = remote |
| |
F = freezes |
| S = summary |
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D* =
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