Error supply shutdown

What does F2840 mean?

An error occurred during the process of shutting down the power supply. This could indicate a problem with the controlled discharge of DC bus capacitors, a failure in the power-down sequence, or an inability to fully remove power. An uncontrolled shutdown can risk personnel safety or damage sensitive components.

• Fault in the power supply discharge circuit
• Failure of shutdown relays or contactors
• Incorrect shutdown sequence execution by firmware
• External fault preventing complete power removal
• Persistent voltage on critical components after shutdown command

Click steps to track your progress.

1. 1

   Verify the stability and integrity of the incoming AC supply voltage at the drive's input terminals throughout the power-down sequence.

2. 2

   Inspect all control wiring and connections (e.g., X10, X31/X32 connectors for STO/HSO) for loose terminals, damage, or contamination that could interrupt the shutdown signal path.

3. 3

   Check the drive parameters related to DC bus monitoring, discharge control, and power-down thresholds against the machine's commissioning documentation.

4. 4

   Safely measure and monitor the DC bus voltage discharge rate immediately after a shutdown command to identify any uncontrolled or abnormally slow/fast decay.

5. 5

   Inspect the external braking resistor (if connected) and its wiring for proper termination, resistance value, and absence of short or open circuits that could interfere with DC bus energy dissipation.