Troubleshooting: UPS Alarms
Display Message | Meaning | Corrective Action |
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Low Battery | The UPS is in battery operation and | No corrective action necessary. |
| the battery charge is low. | Note: Runtime is limited. Shut down the |
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| system and the load equipment or restore |
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| incoming voltage. |
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No Batteries Detected | No battery power is available. | Option 1: Ensure the batteries are installed |
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| properly. |
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| Option 2: Check if the DC Breaker has |
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| been tripped. |
No Power Modules Detected | No power modules are available. |
Option 1: Ensure that the power modules are properly installed, the two fastening screws are tight, and the locking latch is engaged.
Option 2: Check for other communication alarm messages.
Not Synchronized Fault | System cannot synchronize to AC | Option 1: Decrease the sensitivity to input |
| line and bypass mode may not be | frequency. |
| available. | Option 2: Correct the input voltage to |
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| provide acceptable voltage frequency. |
Output Voltage Not In Range | The output voltage is not within the |
| specified range. |
Evaluate the threshold setting. If necessary, adjust it for your situation. Contact APC Customer Support.
Overload | The load has exceeded the system |
| power capacity. |
Option 1: Decrease the load.
Option 2: Add a power module to the system.
Power Failure | The input voltage is not acceptable | Contact APC Customer Support. |
| for normal operation. |
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Power Module Fault | A power module has failed and | See “How to remove a power module” on |
| requires replacement. | page 17. |
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Redundancy Alarm | Actual power module redundancy | Option 1: If possible, install additional |
| has fallen below | power modules. See “How to install a |
| redundancy alarm threshold. At least | power module” on page 17. |
| one power module has failed or the | Option 2: Replace failed modules. See |
| load has increased. | “How to replace a power distribution mod- |
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| ule” on page 19. |
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| Option 3: Reduce the load. |
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| Option 4: Change alarm limit. |
Redundancy Lost | The UPS no longer detects |
| redundant power modules. One or |
| more power modules have failed, or |
| the load has increased. |
Option 1: Install additional power modules.
Option 2: Replace failed modules. See “How to remove a power module” on page 17.
Symmetra PX 160 kW 400 V Operation | 23 |