Charging Fault

What does F80 mean?

The drive failed to reach the required DC voltage within the set charging time for the Main Circuit Breaker (MCB). This can be due to a non-operational charging circuit, a high load on the DC link during charging, or an insufficient supply voltage for the charging circuit. This prevents the drive from starting up properly.

• Failure of the pre-charge resistors or the associated contactors in the DC link charging circuit.
• Loss of one or more input AC phases (e.g., L1, L2, L3) to the drive's rectifier bridge, preventing full DC bus voltage.
• Excessive load on the DC link during the charging sequence, drawing current faster than the pre-charge circuit can supply.
• Degraded or shorted DC link capacitors, unable to hold charge or presenting a high leakage current.
• Faulty DC link voltage measurement circuit or sensor providing an incorrect reading to the drive's control board.
• Parameter P5-06 (DC Link Charge Time) set too short for the drive unit's capacitance or application.

Click steps to track your progress.

1. 1

   Measure the input AC line voltage (e.g., between L1-L2, L2-L3, L3-L1) to confirm all phases are present and at nominal voltage.

2. 2

   Verify the resistance of the pre-charge resistors (if accessible) using an ohmmeter to ensure they are not open or shorted.

3. 3

   Measure the DC link voltage across the DC+ and DC- terminals after attempting to clear the fault, observing the charge rate.

4. 4

   Inspect the pre-charge contactors or solid-state devices for proper operation (e.g., coil voltage, contact continuity).

5. 5

   Increase parameter P5-06 (DC Link Charge Time) in small increments to allow more time for the DC link capacitors to charge.