Overload of digital output terminal 27

What does 40 mean?

The digital output terminal 27 is experiencing an overload condition. This is likely due to excessive current draw from the connected load or a short-circuit, potentially damaging the output circuitry.

• Short-circuit between digital output terminal 27 and ground (0V) or another supply voltage.
• Connected load (e.g., relay coil, solenoid) drawing current significantly exceeding the terminal's rated output (e.g., 200mA).
• Incorrect wiring of the load, causing a direct short across the output transistor of terminal 27.
• Internal component failure on the control board's digital output stage for terminal 27.
• Water ingress or contamination causing a resistive path between terminal 27 and another conductor.

Click steps to track your progress.

1. 1

   Disconnect all external wiring from digital output terminal 27.

2. 2

   Power up the drive and verify if the fault clears; if so, the issue is external to the drive.

3. 3

   With power off, use a multimeter to measure the resistance between terminal 27 and 0V (terminal 33) to check for a short-circuit.

4. 4

   Measure the operating current of the connected load (e.g., relay coil) using a clamp meter, ensuring it is below the terminal's maximum rating (e.g., 200mA).

5. 5

   Check the connected load's wiring for insulation damage or points of contact with ground or other phases.