Operation
Table 7 | Alarms, functions, and corrective actions (continued) |
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Actual |
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Alarm/fault |
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Displayed |
| Description | Fault |
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On Front |
| of Alarm/ | Or | Latch | Dial | Freeze | Event Log |
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Panel |
| Fault | Alarm | Mask | Mask | Mask | Mask | Meaning and Corrective Action(s) | |
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| With the load on UPS, at least one phase of | |
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| the UPS KVA or KW has exceeded the | |
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| rated KVA, KW, or RMS current vs. Time | |
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| equation. (Note: This fault would have been | |
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| preceded by an “Inverter Overload Phase x | |
Inverter Ovld |
| Inverter |
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| alarm.) The UPS will transfer the load to | |
| Overload | Fault | YES | YES | YES | YES | Static Bypass if it is available. If the fault or | ||
xfer |
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| Transfer |
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| overload clears the UPS will automatically | ||
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| transfer from SBS to UPS. Remove the | |
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| excess load from the UPS and attempt to | |
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| UPS and it will not | |
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| Global Services. | |
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| One or more Output Fuses are open. | |
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| (because of capacitance in the system it | |
Inverter Fuse | Inverter Fuse |
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| may take up to 1 minute after a fuse failure | ||
Fault | YES | YES | NO | YES | to detect this fault). The system will transfer | ||||
Fail |
| Fail | |||||||
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| the load to Static Bypass if available and | |||
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| then shut down the UPS. Contact Liebert | |
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| Global Services Immediately. | |
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| The UPS module output voltage is above | |
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| the maximum (+10%) deviation from | |
Output Ov |
| Output |
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| nominal. The load automatically transfers to | |
| Overvolt | Fault | NO | YES | YES | YES | the bypass line. The UPS module is shut | ||
xfer |
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| Transfer |
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| down and isolated. Contact Liebert Global | ||
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| Services at once. Do not attempt to reset | |
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| circuit breakers. | |
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| The UPS module output voltage is under | |
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| the minimum | |
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| Output |
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| nominal. The load automatically transfers to | |
Output Uv |
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| the bypass line. If the alarm condition is no | ||
| Undervolt | Fault | NO | YES | YES | YES | |||
xfer |
| longer present, reset the alarm and | |||||||
| Transfer |
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| retransfer the load from bypass to UPS. | ||
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| Contact Liebert Global Services if alarm | |
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| persists. | |
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| This fault can only be detected when the | |
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| load is on bypass. One or more of the Static | |
SBS SCR |
| SBS SCR |
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| Bypass phases are open. The static switch | |
| Fault | YES | YES | NO | YES | will be shut down and the UPS will shut | |||
Open |
| Open | |||||||
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| down. Power to the load will be lost. | |||
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| Contact Liebert Global Services | |
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| Immediately. | |
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| The system has detected a shorted SCR in | |
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| the Bypass line. If the unit is in the | |
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| mode, start- up will be inhibited. If the unit is | |
SBS SCR |
| SBS SCR | Fault | YES | YES | NO | YES | on UPS, the unit will transfer to Bypass and | |
Shorted |
| Shorted | open the output contactor to prevent back | ||||||
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| feed to the inverter from the Bypass line. | |
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| Contact Liebert Global Services | |
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| Immediately. |
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