Applicable Systems
9395
Symptoms
The Eaton 9395 UPS displays fault code F02 indicating input overvoltage. The UPS input power voltage has exceeded the acceptable maximum threshold. The UPS will transfer the load to battery power to protect downstream equipment from overvoltage damage.
Possible Causes
- Utility voltage surge from lightning or switching events
- Step-up transformer misconfiguration
- Voltage regulator failure at facility power distribution
- Capacitor bank switching by utility causing transient overvoltage
Troubleshooting Steps
- Step 1: Check UPS display for F02 and note input voltage reading
F02 displayed with input voltage above maximum 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 facility voltage regulator and transformer tap settings
Tap settings correct for nominal incoming voltage - Step 4: Install surge protection device if overvoltage events are frequent
SPD installed and transient events no longer trigger F02
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.
Frequently Asked Questions
- Q: What is the maximum input voltage for Eaton 9395?
The overvoltage threshold is typically 276V (single-phase 230V system) or 480V (three-phase 415V system). Exact values vary by model configuration.
- Q: Can frequent F02 events damage the UPS?
Repeated overvoltage events can stress input components, particularly MOVs and input filters. Consider installing a surge protection device upstream of the UPS.
Source: Eaton 9395 UPS Installation & Operation Manual, Document 164201717 Rev 3 (eaton.com)
Category: UPS