Okuma Alarm P-0856 – MCS DC-Bus Voltage Alarm

Okuma Alarm P-0856 (MCS DC-Bus Voltage Alarm) occurs when the DC-bus voltage in the inverter unit rises or falls outside the allowable range, causing the inverter to stop supplying current. This alarm is commonly caused by unstable incoming power, regenerative braking issues, faulty capacitors, power unit problems, or internal inverter circuit faults.