External Sync Failed

What does F69 mean?

This Manual Fault occurs when the external AC sync port connection or cable is faulty, or something is improperly plugged into the AC sync port in a single-inverter system. This prevents proper synchronization.

• Damaged or improperly connected external AC sync cable (e.g., loose shielding, broken conductor) between the inverter and the sync source.
• Incorrect signal levels or timing from the external synchronization source (e.g., signal amplitude below 3V peak-to-peak or frequency deviation).
• Impedance mismatch or improper termination on the AC sync line causing signal reflection or attenuation (e.g., missing termination resistor).
• Failure or unexpected shutdown of the external synchronization source device itself (e.g., dedicated clock generator).
• Configuration error where external sync is enabled (Parameter P2-10 set to 'External Sync') but no valid source is connected.

Click steps to track your progress.

1. 1

   1. Inspect the external AC sync cable for physical damage, proper seating in the 'AC Sync' port, and verify continuity of all conductors using a multimeter.

2. 2

   2. Measure the voltage present on the 'AC Sync' port terminals (e.g., pins 1 and 2) using an oscilloscope to verify signal integrity (e.g., 5V, 50/60Hz square wave).

3. 3

   3. Verify that the external sync source is operational and providing the correct synchronization signal output, matching the inverter's expected specifications.

4. 4

   4. Temporarily disable external synchronization (set Parameter P2-10 to 'Internal Sync') to confirm the inverter operates normally without the external source.

5. 5

   5. Check terminal connections for the AC sync signal on both the inverter and the external sync source for tightness and proper polarity.