Mitsubishi Electric MDS-E Series Instruction Manual page 434

MDS-E/EH Series Instruction Manual
7 Troubleshooting
Overload 2
Alarm No.
Current command of more than 95% of the unit's max. current was being continuously given for longer than 1 second in a servo
51
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
1 Did the alarm occur immediately after READY ON?
Check that the PN voltage is supplied to the drive
unit.
2 MDS-EJ/EJH Series is not connected to the power
supply unit, so investigate item 3 for MDS-EJ/EJH.
[1] Is the CHARGE lamp ON?
Check the motor power cable (U, V, W phases).
[1] The power cable is not connected.
3
[2] Is the cable connected to the motor for another
axis?
Check the encoder cable connection.
4 [1] Is the cable connected to the motor for another
axis?
5 Check whether the machine has collided.
Check whether the current value on the NC Servo
6 Monitor screen is saturated during acceleration/
deceleration.
7 Check the encoder Feedback.
8 Check the load meter value.
Check the PLG output waveform.
9
For TS5690, waveform cannot be checked.
Alarm No.
Excessive error 1
52
A difference between the actual and theoretical motor positions during servo ON exceeded the setting value.
Investigation details
The load inertia is large.
The unbalance torque in the Z (gravity) direction is
1 high.
An excessive workpiece or tool is mounted on the
spindle.
Check the excessive error detection width.
Servo
SV053
2
Spindle
SP023 (Interpolation, spindle
synchronization)SP053 (Non-interpolation)
Check the position encoder polarity.
SV017/bit4 (Servo)
3 SP017/bit4 (Spindle: position FB)
SP017/bit0 (Spindle: speed FB)
#3106/bit7 (Synchronous tap control)
4 Check the alarm No. "51" items.
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
Investigation results
The load inertia is excessive.
The load inertia is normal.
The excessive error detection width is too
small.
Servo standard value:
SV053 ={RAPID/(60*PGN1)}/2
Spindle standard value:
No alarm is set at SP023 =120:0
SP053 =motor max. speed×6/PGV/2
Appropriate values are set.
The polarity is reversed.
Normal.
403
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 encoder.
(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.
Remedies
[1] Lower the machine weight applied to the
servo motors (by the unbalance torque).
[2] Lower the weight of the workpiece.
Investigate item 2.
Set appropriate values.
Investigate item 3.
Correctly set the parameters.
Investigate item 4.
SV SP
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IB-1501229-F