Alarm Number: S01 0032
Document Number: USA-E99981-113-*
Revision Date: 07/24/01
Affected Servo System Spindle System
System Other Systems
M600 Series MDS-A/B/C-Vx MDS-A/B/C-SP
M60 Series MDS-A/B/C-SVJ/SVJ2 MDS-A/B/C-SPJ/SPJ2
M50 Series Intelligent Servo MDS-A/B/C-SPH
S01 003A, 003B, 0061
An overcurrent was detected in the IPM used by the servo or spindle drive. The current flowing to the motors was
excessive. If the problem occurs at power up then the alarm is slightly different than when it appears at the motor
1) If alarm occurs at power on of the NC unit: Power off the machine at the main switch. Support the axis so it
doesn't crash: Z-axis on a vertical machining center, Y-axis on a horizontal machining center and the X-axis on a
turning center. Disconnect the UVW wires leading to the motor, and power on the machine. If the alarm is not
present, then power off the machine at the main switch. Megger the motor and check the wiring back to the motor
for shorts. If the alarm still exists then replace the drive unit.
2) If the alarm occurs when motor start command is given, then power off the machine at the main switch and
remove the UVW wires. Power on the machine and give a start command. Does the alarm 32 appear or do you
have a new alarm? If alarm 32 reappears, then replace the drive unit. If another alarm occurs, turn off the power and
check the wires leading to the motor and Megger the motor.
3) Swap the drive unit.
4) If alarm occurs intermittently, swap the encoder with a similar encoder on another axis. If it is a spindle drive
check the PLG signal.
5) Check to see if the machine is mechanically sound. Check to make sure the axis will turn freely if disconnected from the motor.
Mitsubishi Electric Automation, Inc.
Technical Support & Service Group
CNC Alarm Information Document
Power Module Overcurrent