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10.3. Cause and Remedy of Alarm
10.3. Cause of Alarm and Remedy
u CPU Error
(1) CPU is out of control due to noise.
(2) Defective PCB.
(If the alarm is not deactivated after the
power is turned on.)
Note: 1) The CPU is not functioning, thus the RS-232C communication and other controls are
u Heat Sink Overheat or Regeneration Resistor Overheat: P0
(1) Duty cycle of the Motor is too high.
(2) Excessive load is applied.
(3) Ambient temperature of the Driver Unit
exceeds 50°C.
(4) Heat sink temperature exceeds 90°C due
to continued heavy torque demand.
(5) Defective PCB.
(As soon as the control power is turned on,
the alarm occurs.)
l Even the alarm output is cleared; it will be on again when the thermal sensor remains on.
Cause
disabled because the CPU is not functioning.
2) Contact NSK if the alarm occurred.
Cause
à Take enough time to air-cool the Motor and the Driver Unit.
· Turn the power on again.
· The alarm is deactivated when the power is turned
on again. If the alarm occurs frequently, contact
NSK.
· Replace Driver Unit referring to "Appendix 4. How
to Replace ESB Driver Unit."
· Reduce the load and/or operation duty. Readjust
acceleration/deceleration.
(Stop operation, and then air-cool the Driver Unit
and the Motor.)
· Check surrounding condition of the Driver Unit.
· Stop the operation, and air-cool the Motor and
Driver Unit. Then check the following.
à If the duty cycle is too high.
à If an excessive load is applied.
à If the ambient temperature of the Driver Unit is
too high.
· If no trouble is found in the above check and this
alarm occurs frequently, contact NSK.
· Replace the Driver Unit referring to "Appendix 4.
How to Replace ESB Driver Unit."
— 10-8 —
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Table of Contents
Troubleshooting
