Signal loss detection

What does E.ECT mean?

This fault indicates that a critical input signal required for the FR-A800/A800 Plus Series drive's operation has been lost or is not present. This can relate to control signals or feedback, leading to the drive's protective shutoff.

• Loss of a critical input signal (e.g., run command, enable signal) due to a wiring fault or external control system issue.
• Sensor or feedback device failure if configured to stop the drive on signal loss.
• Parameter setting for signal loss detection (e.g., a 'watchdog' parameter for an input) is too sensitive or incorrectly configured.
• Faulty connections at the control circuit terminal block.

Click steps to track your progress.

1. 1

   Verify the integrity of all control input wiring, especially for critical signals like RES, OH, or any assigned via Pr.178 (Output terminal function selection).

2. 2

   Check the external control system (e.g., PLC, HMI) that provides the input signals to the FR-A800/A800 Plus Series drive for proper operation.

3. 3

   Review parameter settings related to signal loss detection or specific input monitoring (refer to the detailed manual for relevant parameters).

4. 4

   Measure the voltage at the respective control circuit terminals to confirm the presence of expected signals (e.g., 24VDC for ON state).

5. 5

   Inspect the control circuit terminal block on the drive for loose connections or physical damage.