[Cause]
The control device did not respond to the reset stepper command within the given time.
[Countermeasure]
Check whether the welding equipment is functioning properly. When an alarm of SPOT-387~390 has occurred, there is some kind of problem with the communication with the timer board. It's also possible that the timeout is short. Check the "reset welding controller timeout" time on the spot welding initial setting screen and adjust it.