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6. Troubleshooting
6 - 28
Alarm No.
53
Excessive error 2
The difference between the motor's actual position at servo OFF and the theoretical position exceeded
the setting value.
Investigation details Investigation results Remedies SV SP
NC parameter (M60S Series) #1064
svof = 0
Investigate item 2. 1 Check the follow-up function while
the NC is in the servo OFF state.
NC parameter (M60S Series) #1064
svof = 1
Investigate item 3.
{
The axis moved. Adjust the brakes, etc., so that the
axis does not move.
2 Check whether the axis has moved
during servo OFF, and check the
motor brake operation.
The axis has not moved. Investigate item 3.
{
The excessive error detection width is
too small.
SV026 =
RAPID
60
×
PGN1
÷ 2
Set an appropriate value.
3 Check the excessive error detection
width.
SV026 (Servo)
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
The motor current was not detected when the excessive error 1 alarm occurred.
Investigation details Investigation results Remedies SV SP
The voltage is not supplied. Correctly supply the PN voltage. 1 Check that the PN voltage is supplied
to the drive unit.
• Is the CHARGE lamp ON?
Approx. 300V is correctly supplied. Investigate item 2.
{
The connections are incorrect. Connect correctly. 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?
The connections are correct. Replace the drive unit.
{
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.
Ideal machine position
Servo OFF
Command position
Servo ON
Time
OD1
OD1
OD2
OD2
Position