Mitsubishi Electric Melservo-J4 Instruction Manual page 46

Alarm No.: 24
Alarm content
Detail Detail name
No.
24.1 Ground fault
detected by
hardware
detection circuit
24.2 Ground fault
detected by
software
detection
function
1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
44
1.4 Remedies for alarms
Name: Main circuit error
 A ground fault occurred on the servo motor power lines.
 A ground fault occurred at the servo motor.
 Power supply voltage for inverter circuit control is low. (Only for MR-J4W2-0303B6)
Cause Check method
(1) The servo amplifier is Disconnect the servo
malfunctioning. motor power cables (U/V/
W) and check if the alarm
occurs.
(2) A ground fault or short Check if only the servo
occurred at the servo motor power cable is
motor power cable. shorted.
(3) A ground fault occurred Disconnect the servo
at the servo motor. motor power cables on
motor side, and check
insulation of the motor
(between U/V/W/
(4) The main circuit power Shut off the power, and
supply cable and servo check if the main circuit
motor power cable were power supply cable and
shorted. servo motor power cable
are in contact.
(5) Something near the Check the noise, ambient
device caused it. temperature, etc.
(1) For MR-J4W2-0303B6, Check the control circuit
the servo-on command power supply voltage
was inputted when the when the servo-on
control circuit power command was inputted.
supply voltage was
below 20 V.
(2) The servo amplifier is Disconnect the servo
malfunctioning. motor power cable (U/V/
W), and check if the
alarm occurs.
(3) A ground fault or short Check if only the servo
occurred at the servo motor power cable is
motor power cable. shorted.
(4) A ground fault occurred Disconnect the servo
at the servo motor. motor power cables on
motor side, and check
insulation between
phases (U/V/W/
(5) The main circuit power Shut off the power, and
supply cable and servo check if the main circuit
motor power cable were power supply cable and
shorted. servo motor power cable
are in contact.
(6) Something near the Check the noise, ambient
device caused it. temperature, etc.
Check result
It occurs.
It does not occur.
It is shorted.
It is not shorted.
It is shorted.
It is not shorted.
).
They are in contact.
They are not in contact.
There is a problem in the
surrounding.
The control circuit power
supply voltage was
below 20 V.
The control circuit power
supply voltage was 20 V
or higher.
It occurs.
It does not occur.
It is shorted.
It is not shorted.
It is shorted.
It is not shorted.
).
They are in contact.
They are not in contact.
There is a problem in the
surrounding.
Action Target
Replace the servo [A]
amplifier. [B]
[WB]
Check (2).
[RJ010]
[GF]
Replace the servo motor
power cable.
Check (3).
Replace the servo motor.
Check (4).
Correct the wiring.
Check (5).
Take countermeasures
against its cause.
Input the servo-on [WB]
command after the
control circuit power
supply voltage reaches
20 V or higher.
Check (2).
Replace the servo [A]
amplifier. [B]
[WB]
Check (3).
[RJ010]
[GF]
Replace the servo motor
power cable.
Check (4).
Replace the servo motor.
Check (5).
Correct the wiring.
Check (6).
Take countermeasures
against its cause.