Applicable Systems
9395
Symptoms
The Eaton 9395 UPS displays fault code F01 indicating input undervoltage. The UPS input power voltage has fallen below the acceptable minimum threshold. The UPS will transfer the load to battery power to maintain output continuity.
Possible Causes
- Utility voltage sag or brownout from power grid
- Input wiring undersized causing voltage drop under load
- Input breaker or fuse partially blown creating resistance
- Transformer tap setting incorrect for actual line voltage
Troubleshooting Steps
- Step 1: Check UPS display for F01 and note input voltage reading
F01 displayed with input voltage below minimum threshold - Step 2: Measure actual input voltage at UPS terminals with true RMS meter
Voltage reading matches UPS display within 2V tolerance - Step 3: Inspect input wiring, breakers, and connections for loose terminals
All connections tight, breakers fully closed - Step 4: Contact utility company if voltage is consistently below nominal
Utility confirms voltage within normal range or dispatches repair
How to Reset
To reset: 1) Restore input voltage to acceptable range. 2) Press RESET on UPS control panel. 3) Verify UPS returns to normal (online) mode. Caution: Do not bypass the UPS to utility if voltage is unstable.
Frequently Asked Questions
- Q: What is the minimum input voltage for Eaton 9395?
The typical input voltage range is 220-415 VAC depending on model configuration. The undervoltage threshold is approximately 170V (single-phase) or 340V (three-phase). Exact values are in the installation manual.
- Q: How long will the battery last on F01?
Runtime depends on battery capacity and load. Typical 9395 systems provide 5-15 minutes at full load. Monitor battery capacity indicator during F01 condition.
Source: Eaton 9395 UPS Installation & Operation Manual, Document 164201717 Rev 3 (eaton.com)
Category: UPS