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MDS-D2/DH2 Series Instruction Manual
7.3 Troubleshooting
Alarm No.
53
Excessive error 2
A difference between the actual and theoretical motor positions during servo OFF exceeded the setting value.
Investigation details Investigation results Remedies SV SP
1
Check the follow-up function while the NC is in the
servo OFF state.
The axis detachment function (NC
parameter) is invalid.
(Note) For the axis detachment function,
refer to the NC manual.
Check the investigation item No. 2.
◯
The axis detachment function (NC
parameter) is valid.
(Note) For the axis detachment function,
refer to the NC manual.
Check the investigation item No. 3.
2
Check whether the axis has moved during servo
OFF (either by visual inspection or monitor the
position droop waveform).
[1] Check if the motor brake is released in the
middle.
[2] Check if the axis moves because the servo OFF
is applied during the C axis mode.
[1] The axis has moved.
[2] The servo OFF is applied during the
mode.
[1] Adjust the brakes, etc. so that the axis
does not move.
[2] Avoid the servo OFF from being applied
during position control.
◯
The axis has not moved. Check the investigation item No. 3.
3
Check the excessive error detection width.
SV026 (Servo)
(Note) Set the same value to SV023.
The excessive error detection width is too
small.
SV026 ={RAPID/(60*PGN1)}/2
Set an appropriate value.
◯
An appropriate value is set.
Check for problems on the NC side, such as
the position FB follow-up control.
Alarm No.
54
Excessive error 3
When an excessive error 1 occurred, detection of the motor current failed.
Investigation details Investigation results Remedies SV SP
1
Check that the PN voltage is supplied to the drive
unit.
[1] Is the CHARGE lamp ON?
The voltage is not supplied. Correctly supply the PN voltage.
◯◯
It is correctly supplied (DC300V). Investigate item 2.
2
Check the motor power cable (U, V, W phases).
[1] The power cable is not connected.
[2] Is the cable connected to the motor for another
axis?
The connections are incorrect. Connect correctly.
◯◯
The connections are correct. Replace the drive unit.
Servo OFF
Servo ON
Time
OD1
OD1
OD2
OD2
Position
Depending on the ideal machine position in respect to the command position, the actual machine
position could enter the actual shaded section shown below, which is separated more than the
distance set in OD1.
Supplement
(servo)
Ideal machine position
Command position