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6. Troubleshooting
6 - 16
Alarm No.
25
Absolute position lost
The backup voltage in the absolute position detector dropped causing the absolute position to be lost.
Investigation details Investigation results Remedies SV SP
The warning is occurring. Investigate item 2. 1 Is warning 9F occurring at the same
time?
The warning is not occurring. Investigate item 3.
{
3V or less. Replace the battery, and establish the
zero point.
2 Measure the battery voltage with a
tester.
3V or more. Check the NC bus cable connection.
{
Alarm 18 occurred. Turn the drive unit control power ON
again, and establish the zero point.
3 Did alarm 18 occur when the power
was turned ON the last time?
Alarm 18 did not occur. Investigate item 4.
{
The unit was left for a long time.
Guide at delivery : 20 hours or more
After 5 years : 10 hours or more
Turn the drive unit control power ON
again, and establish the zero point.
4 Was the detector cable or battery
cable disconnected from the unit for a
long time?
The cables were not disconnected. Investigate item 5.
{
The connection is faulty. Replace the cable. 5 Check the detector cable or battery
cable connection with a tester.
The connection is normal. Replace the drive unit.
{
Alarm No.
26
Unusable axis error
A power module error is occurring with the axis for which the axis No. selection switch is set to "F" (not
used axis).
Investigation details Investigation results Remedies SV SP
No abnormality is found in particular. Replace the drive unit. 1 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
An abnormality was found in the
ambient environment.
Take remedies according to the
causes of the abnormality.
Ex. High temperature:
Check the cooling fan.
Incomplete grounding:
Additionally ground.
{
Alarm No.
27
Machine side detector, CPU error 2
A CPU error was detected with the linear scale.
Investigation details Investigation results Remedies SV SP
1 Check the alarm No. "1B" items.
{
Alarm No.
28
Machine side detector, overspeed
A speed exceeding the specified maximum speed was detected with the linear scale.
Investigation details Investigation results Remedies SV SP
The rapid traverse rate is higher than
the specified value.
Use within the specified range. 1 Check the linear scale's maximum
speed.
The rapid traverse rate is less than
the specified value.
Investigate item 2.
{
No abnormality is found in particular. Replace the linear scale. 2 Check if there is any abnormality in
the detector's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
An abnormality was found in the
ambient environment.
Take remedies according to the
causes of the abnormality.
Ex. High temperature:
Check the cooling fan.
Incomplete grounding:
Additionally ground.
{
Alarm No.
29
Machine side detector, absolute position data error
An error was detected in the absolute position data detection circuit with the linear scale.
Investigation details Investigation results Remedies SV SP
1 Check the alarm No. "1B" items.
{
Alarm No.
2A
Machine side detector, incremental position data error
An error was detected in the relative position data detection circuit with the linear scale.
Investigation details Investigation results Remedies SV SP
1 Check the alarm No. "1B" items.
{