NSK MEGATORQUE M-ESB-YSB2020AB300 - Resolver Circuit Error: A0; Software Thermal Sensor: A3

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10.3. Cause and Remedy of Alarm
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u Resolver Circuit Error: A0
Cause Remedy
(1) Resolver cable disconnected. Refer to
“Appendix 2. How to Check Motor
Condition.”)
· Turn off power, check the resolver cable and the
connector.
(2) Breakage of resolver cable. (Refer to
“Appendix 2. How to Check Motor
Condition.”)
· Replace the resolver cable.
(3) Defective resolver. (Refer to “Appendix 2.
How to Check Motor Condition.”)
· Replace the Motor.
(4) Defective PCB. (When the alarm occurs
even the resolver and the cable are
normal, and the connector is properly
secured.)
· Replace the Driver Unit referring to “Appendix 4,
How to Replace ESB Driver Unit.”
Note : 1) Check the resolver cable for breaking and short of wires.
2) Check the connector for contact failure.
3) When the resolver cable is forced to bend repeatedly, the bending radius and
frequency will affect on the life of the cable. It is necessary to check insulation and
continuity of the cable periodically.
4) When an excessive current applied to the resolver due to internal contact between the
rotor and the stator, or collision of Motor, the fuse protecting the exciting circuit of
resolver may blow out. It requires replacing of the Motor and the Driver Unit in such
a case.
u Absolute Position Error (In use of an absolute position sensor only): A1
Cause Remedy
1) The motor moved when the power is
on.
· Turn on the power again.
2) Defective printed circuit board.
· Replace the Driver Unit referring to “Appendix4. How
to Replace ESB Driver Unit.”
l The Motor absolute position scale is defined at the moment of initialization of the Driver Unit
when the power is turned on. At this moment, if the Motor moves because of external force or
vibration, it cannot define the correct position scale, and this leads to the alarm. Therefore,
change the timing of power-on if the alarm occurs because of the motion of other unit when the
power is on.
u Software Thermal Sensor: A3
Cause Remedy
(1) Excessive Motor duty cycle.
· Reduce duty cycle and the load. Re-adjust
acceleration/deceleration.
· Air-cool the Motor as it is overheated after it has
stopped. Then turn on the power again.
(After stopping operation, keep the control power
on.)
(2) Mechanical restraint to the Motor such as
brake or an obstacle.
· Remove mechanical obstacle.
(3) Poor gain setting.
· Readjust the gain.
(Refer to “8. Tuning and Trial Running.”)
(4) Unmatched combination of Motor and
Driver Unit.
· Check the combination.
· (Reference number of Motor and Driver Unit.)
Note: Do not change the setting of parameter OL. It is properly set at the factory for each
Motor size.