External fault

What does F51 mean?

A digital input configured for external fault monitoring has been activated, signaling a fault condition from an external device or system. This is a generic fault triggered by an external safety or monitoring circuit.

• Activation of an external safety device (e.g., E-stop, safety light curtain, safety gate) connected to a configured digital input (e.g., DI1).
• Trip condition from an external motor overload relay or thermal protection device connected to a digital input.
• Fault in the external system's control logic or PLC sending an erroneous fault signal to the drive's digital input.
• Broken or short-circuited control wiring to the digital input (e.g., between DI1 and COM) causing a false fault trigger.
• Loss of auxiliary supply voltage (e.g., 24VDC) powering the external device providing the fault signal.

Click steps to track your progress.

1. 1

   Identify the specific digital input (e.g., DI1) configured as the external fault input using parameters like P2-01 (Digital Input 1 Function).

2. 2

   Visually inspect and verify the status of all external devices connected to the identified digital input.

3. 3

   Measure the voltage across the identified digital input terminal (e.g., DI1 to COM) to confirm the active state of the fault signal.

4. 4

   Trace the control wiring from the external device to the drive's digital input, checking for cable damage or loose connections.

5. 5

   Review the external device's status indicators or diagnostic messages to pinpoint the source of its fault condition.

6. 6

   Temporarily disconnect the external fault signal from the digital input (for troubleshooting only) to verify the drive's reaction.