Maximum Backup Power Restart Attempts Reached

What does 1177 mean?

Service message 1177 indicates that the Fronius Primo GEN24 inverter has reached the maximum number of automated restart attempts in backup power mode. This limit is set by the "Backup power restart attempts" parameter (range 1-10). Once this limit is reached, the inverter will not automatically restart backup power mode until the service message is manually acknowledged. This typically occurs after repeated shutdowns due to unstable backup power conditions.

• Frequent undervoltage events (U<) in backup power mode, exceeding the "Backup power undervoltage protection time U<" setting.
• Frequent overvoltage events (U>) in backup power mode, exceeding the "Backup power surge protection time U>" setting.
• Repeated short circuits detected during backup power mode, causing the inverter to repeatedly attempt to switch off and restart within the "Backup power short circuit switch-off time".
• Unstable or fluctuating loads connected during backup power operation, leading to voltage excursions beyond permissible limits.

Click steps to track your progress.

1. 1

   Manually acknowledge service message 1177 on the inverter's user interface to clear the fault and reset the backup power restart counter.

2. 2

   Review the inverter's event log for any preceding fault codes related to undervoltage, overvoltage, or short circuits that occurred prior to message 1177.

3. 3

   Verify the settings for "Backup power undervoltage protection limit value U< [pu]", "Backup power surge protection limit value U> [pu]", and their corresponding trip times, ensuring they are appropriate for the connected loads and expected backup power conditions.

4. 4

   Inspect the backup power wiring and connected loads for any potential short circuits, overloads, or loose connections that could cause instability.

5. 5

   Measure the voltage and current at the backup power output during operation (if possible without tripping) to identify any load-related issues or voltage fluctuations.