Process Voltage Too High

What does 16138 mean?

This error indicates that the measured process voltage supplied to the safety I/O module or its channels exceeds the permissible operating limits. This overvoltage condition can damage the module or connected components if not addressed promptly, posing a risk to system integrity.

• The process voltage supplied to the safety I/O module's power terminals (e.g., L+ and M) exceeds the module's maximum input rating (e.g., >30VDC).
• Malfunction of the external power supply unit (PSU), causing it to output an overvoltage.
• Incorrect wiring of the process voltage supply, inadvertently connecting to a higher voltage source.
• Transient overvoltage spike on the supply line due to switching inductive loads or external disturbances.

Click steps to track your progress.

1. 1

   1. Immediately measure the voltage at the process voltage input terminals (e.g., L+ and M) of the safety I/O module with a multimeter.

2. 2

   2. Check the output voltage of the power supply unit (PSU) feeding the safety I/O module.

3. 3

   3. Verify the wiring connections from the PSU to the safety I/O module for correct voltage routing.

4. 4

   4. Implement surge protection devices or line filters on the process voltage supply if transient spikes are suspected.

5. 5

   5. If the module has been subjected to prolonged overvoltage, replace the safety I/O module as internal components may be damaged.