Relay(s) Welded

What does F17 mean?

This Manual Fault indicates that the AC1 L1 transfer relay is faulty, or an external AC source was incorrectly wired directly to the AC output. This can lead to improper power transfer and potential damage to the inverter.

• Excessive current draw through the AC1 L1 transfer relay causing contacts to arc and weld shut.
• Malfunction of the relay's internal mechanism due to mechanical stress or aging.
• Incorrect external wiring of a live AC source directly to the inverter's AC1 L1 output terminal.
• Short circuit or ground fault on the AC1 L1 output path, leading to prolonged high current through the relay.
• Defective relay control circuit, continuously energizing the AC1 L1 relay coil without proper disengagement.

Click steps to track your progress.

1. 1

   De-energize all AC sources and measure continuity across the AC1 L1 transfer relay contacts with the relay commanded OFF (should be open circuit).

2. 2

   Visually inspect AC1 L1 output wiring for any incorrect direct connections from an external AC source to the inverter output terminals.

3. 3

   Check the relay drive circuit voltage (e.g., 24VDC or 12VDC) at the coil terminals to ensure it drops to 0V when the relay is commanded OFF.

4. 4

   Measure current draw on the AC1 L1 output under normal operation to ensure it does not exceed the relay's rated current.

5. 5

   Isolate the AC1 L1 circuit from all loads and sources, then cycle the inverter's transfer function to observe if the relay physically engages/disengages.