The meaning of OC1 is over current during Acceleration. This fault appears when the motor is drawing excess current during acceleration.
Main probable causes of the fault:
1 The acceleration time ACC is too short.
2 The parameter Pt(Motor Control Mode) is incorrect.
3 The drive is starting into a rotating load.
4 A special motor (e.g. motor with small impedance) is used.
Remedies:
1 Increase the acceleration time
2 Check the Pt (Motor Control Mode) parameter.
3 Use F301 (Auto-Restart) and F302 (Coast Stop).
4 Adjust the switching frequency F300.
5 Set parameter F316(Switching Frequency Control Mode) to 1 or 3 (carrier frequency is decreased automatically).