Mitsubishi MELDAS MDS-C1 Instruction Manual page 272

Excessive error 2
Alarm No.
The difference between the motor's actual position at servo OFF and the theoretical position exceeded
53
the setting value.
Investigation details
1 Check the follow-up function while
the NC is in the servo OFF state.
2 Check whether the axis has moved
during servo OFF, and check the
motor brake operation.
3 Check the excessive error detection
width.
SV026 (Servo)
Excessive error 3
Alarm No.
The motor current was not detected when the excessive error 1 alarm occurred.
54
Investigation details
1 Check that the PN voltage is supplied
to the drive unit.
• Is the CHARGE lamp ON?
2 Check the motor power cable (U, V,
W phases).
• The power cable is not connected.
• Is the cable connected to the motor
for another axis?
Supplement (servo)
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.
Position
OD2
OD2
Servo OFF
6. Troubleshooting
Investigation results
NC parameter (M60S Series) #1064
svof = 0
NC parameter (M60S Series) #1064
svof = 1
The axis moved.
The axis has not moved.
The excessive error detection width is
too small.
RAPID
÷ 2
SV026 =
60 × PGN1
An appropriate value is set.
Investigation results
The voltage is not supplied.
Approx. 300V is correctly supplied.
The connections are incorrect.
The connections are correct.
Command position
OD1
OD1
Servo ON
6 - 27
Remedies
Investigate item 2.
Investigate item 3.
Adjust the brakes, etc., so that the
axis does not move.
Investigate item 3.
Set an appropriate value.
Check for problems on the NC side,
such as the position FB follow-up
control.
Remedies
Correctly supply the PN voltage.
Investigate item 2.
Connect correctly.
Replace the drive unit.
Ideal machine position
Time
SV SP
SV SP