ST300 Series | E42, what does this message mean, and what can be done?
If the error message E42 appears on the frequency converter display, it indicates a fault in the safe circuit of channel H2.
Causes:
Incorrect wiring of the STO.
Fault occurred at the external STO switch.
Hardware fault in the safety circuit of channel H2.
Solutions:
Check whether the terminal wiring of the STO channel H2 is correct and properly tightened.
Check whether the external STO safety switch is functioning correctly.
If the error occurs repeatedly, replace the control board.
Note:
To reset this error message, the device must be restarted.
If none of these causes apply, please contact technical support.