Yaskawa MP940 - Manual (Page 377)

SERVOPACK Inspection, Maintenance, and Troubleshooting
10.2.1 Troubleshooting Problems with Alarm Displays
10-10
„ A.40
A.40: Main Circuit DC Voltage Error Detected: Overvoltage
Display and Outputs
Note: OFF: Output transistor is OFF (alarm state).
ON: Output transistor is ON.
Status and Remedy for Alarm
„ A.41
A.41: Main Circuit Voltage Error Detected: Undervoltage
Display and Outputs
Note: OFF: Output transistor is OFF (alarm state).
ON: Output transistor is ON.
Alarm Outputs
Alarm Code Outputs
ALM Output
ALO1 ALO2 ALO3
OFF OFF ON OFF
Cause Remedy
A The power supply voltage is not within
the range of specifications. Check power supply.
B Load exceeds capacity of the Regener-
ative Unit. Check specifications of load moment
of inertia and overhanging load.
C Regenerative transistor is abnormal. Replace SERVOPACK.
D Rectifying diode defective.
E SERVOPACK defective.
Alarm Outputs
Alarm Code Outputs
ALM Output
ALO1 ALO2 ALO3
OFF OFF ON OFF
E A, B, C, D
A, D
During servomotor
operation
Occurred when main cir-
cuit power turned ON.
Occurred when the con-
trol power turned ON.