Activation time of enabling control exceeded

What does F3142 mean?

The activation time for the enabling control signal has been exceeded. The enabling control signal (e.g., Safe Torque Off - STO) is critical for allowing or disallowing motor torque. If it takes too long to activate after being commanded, it indicates a failure in the safety circuit's response time, compromising personnel and machine safety.

• Slow-acting safety relay or contactor for enabling control
• Faulty wiring in the enabling circuit causing resistance
• Internal safety module output delay
• Incorrectly configured monitoring time for enabling control
• Insufficient voltage to activate enabling circuit elements

Click steps to track your progress.

1. 1

   Inspect the wiring connecting the external safety circuit (e.g., safety relay, safety PLC) to the drive's Safe Torque Off (STO) input terminals for damage, loose connections, or incorrect termination.

2. 2

   Measure the voltage at the drive's STO input terminals when the safety function is commanded to allow torque, ensuring it meets the specified voltage levels (e.g., 24VDC) as per the drive's manual and the external safety circuit's specifications.

3. 3

   Verify the operational status and output signals of the external safety device (e.g., safety relay, safety PLC) that controls the drive's STO function, checking for correct switching and response times.

4. 4

   Check the drive's safety-related parameters (e.g., those governing STO input configuration, reaction times, and source selection) against the machine's safety documentation and Rexroth specifications for correct configuration.