Okuma Alarm P-0857 – MCS Motor Overcurrent

Okuma Alarm P-0857 (MCS Motor Overcurrent) occurs when the inverter unit detects excessive current in the motor circuit.
This is typically caused by a short circuit in the motor cable, a motor fault, or an issue inside the drive/inverter unit.

If the alarm appears repeatedly, the motor wiring and inverter output stage should be checked to prevent further damage.