Table 16. Typical Alarms and Conditions (continued)
Alarm or Condition | Possible Cause | Action |
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Bypass AC Under Voltage | The measured voltage on | A notification alarm is generated and the | ||
(Notice 4) | Bypass is less than the upper | notice is logged. |
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voltage limit specification for |
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Intermittent Alarm | Only apply this setting when Qualify Bypass is | |||
bypass operation. | ||||
set to Always and utility is present, but below | ||||
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| the bypass undervoltage range. |
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| Do not apply this setting if a Utility Not | ||
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| Present alarm is active. |
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Bypass Under/Over Freq | The measured voltage on | A notification alarm is generated and the | ||
(Notice 5) | Bypass is | notice is logged. |
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the upper or lower voltage limit |
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Intermittent Alarm | Only apply this setting when Qualify Bypass is | |||
specification for bypass | ||||
set to Always and utility is present, but outside | ||||
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| operation. | |||
| the bypass frequency range. |
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| Do not apply this setting if a Utility Not | ||
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| Present alarm is active. |
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Rectifier Input Over Current | The UPS has detected that | The UPS transfers to Battery mode if |
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(Alarm 26) | rectifier input current limits | supporting the load. |
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have been exceeded. |
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Continuous Alarm |
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Inverter Output Over | The UPS has detected that the | The UPS transfers to Bypass mode if |
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Current | inverter output current limits | supporting the load. |
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(Alarm 27) | have been exceeded. |
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Continuous Alarm |
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DC Link Over Voltage | The link or rail voltage has | The UPS transfers to Battery mode if |
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(Alarm 28) | exceeded its upper threshold | supporting the load. |
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limit. |
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Continuous Alarm |
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DC Link Under Voltage | The link or rail voltage has | The UPS transfers to Battery mode if |
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(Alarm 29) | dropped below its lower | supporting the load. |
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threshold limit. |
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Intermittent Alarm |
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DC Link Imbalance | The internal ± DC bus (DC | The UPS transfers to Battery mode if |
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(Alarm 1234) | rail) voltages generated in the | supporting the load. |
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UPS are imbalanced. |
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Intermittent Alarm |
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Rectifier Fault | The UPS has detected a fault in | Contact your service representative. |
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(Alarm 30) | the rectifier circuit while |
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attempting recovery from |
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Continuous Alarm |
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Bypass mode or Converter |
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| mode. |
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| Troubleshooting | 71 | |
