UPS Status Messages
Table 49 UPS status messages
Event Message | Description / Suggested Action (if any) | |
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| The UPS is overloaded when the load arises above 105% nominal rating. | |
| The alarm automatically resets once the overload condition is removed. | |
| Confirm that the alarm is true by checking the load percent indicated on the LCD panel to | |
Unit Overload | determine which phase is being overloaded. | |
If the alarm is true, measure the actual output current to verify that the indications are valid. | ||
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| Disconnect unnecessary load. In a parallel system, a severe load sharing error can also lead to | |
| the alarm. | |
| Contact Liebert Services at | |
| The UPS parallel system is overloaded when the total load arises above 105% nominal rating | |
| for the set basic number of UPS units. The alarm resets automatically once the overload | |
| condition is removed. | |
System Overload | Confirm that the alarm is true by checking the system load percent indicated on the LCD panel | |
to determine which phase is being overloaded. | ||
| ||
| If the alarm is true, measure the actual output current to verify that the indications are valid. | |
| Disconnect unnecessary load and ensure the safety. In a parallel system, a severe load sharing | |
| error can also leads to the alarm. | |
| The UPS is overloaded and the overload times out. | |
| Note 1: The highest loaded phase will indicate overload | |
| Note 2: When the timer is active then alarm “unit overload” should also be active as the load is | |
| above nominal. | |
| Note 3: When the timer has expired, the inverter Static Switch is opened and the load | |
Unit Overload Timeout | transferred to bypass. The inverter shutdown and will restart after 1 seconds. | |
| Note 4: If the load decreases lower than 95% after 5 minutes, the system will transfer back to | |
| inverter mode. | |
| Confirm that the alarm is genuine by checking the load percent indicated on the LCD. If an | |
| overload is indicated then check the load, and investigate any additional load connected prior to | |
| the alarm (if applicable). | |
Inverter Overcurrent | The current of inverter IGBT is over limit. If the fault will not reset, contact Liebert Services at | |
| ||
| The phase sequence direction of bypass voltage is reversed. | |
| Normally, the phase of Phase B lags 120 degrees behind Phase A, and the phase of Phase C | |
Bypass Phase Reversed | lags 120 degrees behind Phase B. | |
| Verify that the phase rotation of the bypass supply presented to the UPS is correct, and rectify it | |
| if it is found to be in error. Contact Liebert Services at | |
Load Impact Transfer | A transfer to bypass occurred due to a large step load. The UPS should recover automatically. | |
Turn on connected equipment in sequential order to reduce the step loading of the inverter. | ||
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| The load is on bypass power due to excessive number of transfers that occurred within the last | |
Transfer Timeout | hour. | |
The UPS will recover automatically and will transfer the load back to inverter power within an | ||
| ||
| hour. | |
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Load Sharing Fault | UPS units working within a parallel system are not sharing load current correctly. Contact | |
Liebert Services at | ||
| ||
DC Bus Abnormal | Shut off inverter due to abnormal DC bus voltage. | |
Contact Liebert Services at | ||
| ||
System Transfer | The whole paralleled UPS system transferred to bypass at the same time. This message will | |
appear on the UPS which passive transfer to bypass. | ||
| ||
Parallel Board Fault | Parallel board is not working correctly. Contact Liebert Services at | |
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| Rectifier, inverter and battery converter were shut down because DC bus voltage is too high. | |
DC Bus Overvoltage | Check whether there is a fault in rectifier side. If not, check whether overload occurs. | |
Restart the inverter after resetting the fault. If fault does not clear, contact Liebert Services at | ||
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| The parallel cables are not connected correctly in a parallel system. | |
| Reset the fault by pressing the Fault Clear button, then restart the inverter by pressing the | |
Parallel Connect Fault | Inverter On button. | |
| If the UPS does not resume normal operation, contact Liebert Services at | |
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Bypass Overcurrent | Bypass current is over limit above 135% rating. The UPS just alarms and does nothing. Refer to | |
your installation documentation or contact Liebert Services at | ||
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