ON BATTERY Eaton — On Battery / Utility Failure

At a glance

Severity: WARNING THEN STOP
Domain: UPS_SYSTEM
Reference standard: IEC 62040-3 / EN 50600-2-2

What it means

The UPS is running from its battery bank because the input utility voltage is missing or out of tolerance. If mains does not return within the available runtime, the UPS shuts down and the load drops.

Probable causes

Utility outage or upstream switching operation
UPS input circuit breaker tripped
Missing phase or wrong phase sequence upstream
Input voltage outside the UPS tolerance window
Input circuit failure / rectifier in protection

Where to start

Measure the UPS input voltage (phase-phase and phase-neutral) upstream of the maintenance bypass switch and check the dedicated breaker.

Full guided diagnosis in the app

The diagnostic tree for this fault has 5 guided steps with measurements, checks and resolutions. You'll find it in DataCIQ, one of the five IndexOS apps: free, works offline.

Open DataCIQ

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The same fault on other brands

More Eaton codes

BATTERY FAULT — Replace Battery / Battery Fault
ON BYPASS — On Bypass / Inverter Fault
OVERLOAD — Output Overload
RECTIFIER FAULT — Rectifier / Charger Fault (DC Bus)
TEMPERATURE HIGH — Internal Overtemperature