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MITSUBISHI CNC
Appendix 2 Explanation of Alarms
Overload 2
Alarm No.
Current command of more than 95% of the unit's max. current was being continuously given for longer than
51
1 second in a servo system. In a spindle system, current command of more than 95% of the motor's max.
current was being continuously given for longer than 1 second.
Investigation details
Did the alarm occur immediately after
1
READY ON?
Check that the PN voltage is supplied
to the drive unit.
MDS-D-SVJ3 Series is not connected
2
to the power supply unit, so
investigate item 3 for MDS-D-SVJ3.
[1] Is the CHARGE lamp ON?
Check the motor power cable (U, V, W
phases).
3
[1] The power cable is not connected.
[2] Is the cable connected to the motor
for another axis?
Check the detector cable connection.
4
[1] Is the cable connected to the motor
for another axis?
Check whether the machine has
5
collided.
Check whether the current value on
the NC Servo Monitor screen is
6
saturated during acceleration/
deceleration.
7 Check the detector Feedback.
8 Check the load meter value.
Check the PLG output waveform.
9
For TS5690, waveform cannot be
checked.
628
Investigation results
The alarm occurred after ready ON
before operation starts.
The alarm occurred after normal
operation.
The CHARGE lamp becomes dark.
L+ or L- screw was loosened.
Approx. 300V is correctly supplied.
The connections are incorrect.
Connected to the incorrect axis.
The connections are correct.
The connections are incorrect.
The connections are correct.
The machine has collided.
The machine has not collided.
The current is saturated during
acceleration/deceleration.
The current value during acceleration/
deceleration is appropriate.
The Feedback signal is abnormal.
- The droop does not stabilize.
The Feedback signal is normal.
The value is large.
The value is normal.
There is a problem.
Normal
Remedies
Investigate item 2.
Investigate item 5.
Increase the capacity of power supply.
Tighten the L+ and L- screws.
Investigate item 3.
Connect correctly.
Investigate item 4.
Connect correctly.
Investigate item 5.
Check the machining program and
soft limit settings.
Investigate item 6.
Increase the acceleration/
deceleration time constant.
Investigate item 7.
Replace the detector.
(With the absolute position system,
the zero point must be established.)
Replace the drive unit.
Lower the load.
Investigate item 9.
Adjust the PLG output waveform.
Replace the drive unit.
SV SP
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Troubleshooting
