Output relay

What does A881 mean?

This warning is triggered by an edge counter, implying a monitoring function for an output relay has reached a programmed limit or detected an unexpected edge transition. It likely indicates an issue with the relay's operation or a need for inspection. Unresolved, this could affect controlled equipment.

• The drive's internal edge counter (e.g., Parameter P4-02 Output Relay Cycle Count) for an output relay has reached its programmed switching limit.
• Output relay contacts are worn or damaged due to repetitive switching cycles or an inductive load without adequate suppression.
• External load connected to the output relay draws current exceeding the relay's rated capacity (e.g., 5A @ 250VAC resistive).
• Incorrect parameterization of the output relay counter's threshold (P4-02.01) causing the warning to trigger too soon.
• Frequent, unnecessary switching operations of the relay due to logic errors in the control system.

Click steps to track your progress.

1. 1

   Identify the specific output relay (e.g., RO1, RO2) triggering the warning by checking parameter P4-02 (Output Relay Cycle Count).

2. 2

   Measure the resistance across the relay contacts (e.g., between terminals 1 and 2 for NO contact) in both open and closed states to check for degradation.

3. 3

   Verify the current drawn by the external load connected to the relay using a clamp meter to ensure it does not exceed the relay's maximum current rating.

4. 4

   Inspect the physical condition of the relay contacts for signs of pitting, carbon buildup, or discoloration.

5. 5

   If the relay is integrated into the drive, replacement of the control board might be necessary. If external, replace the faulty output relay module.

6. 6

   Reset the output relay cycle counter by setting parameter P4-02.02 (Reset Counter) to '1' (Execute) after performing maintenance or replacement.