NSK Megatorque PS Series, User Manual

Page: 324 / 370

— 11-8 —
11.3. Cause and Remedy
11.3.1. CPU Error
The CPU integrated into the Driver Unit controls various types of operation.
This alarm reports that the CPU is not properly functioning.
Table 11-8: Cause and remedy for CPU error alarm
Cause Remedy
(1)
The CPU is not functioning due to
noise.
•
Restart the power
•
Take measures against noise.
(2) Defective Driver Unit
•
When it does not recover by the reset of power, the Driver Unit
may be defective. Replace it referring to “Appendix 4: Procedure
for Replacing the EDC Driver Unit,” if necessary.
11.3.2. Alarm A0: Disconnected Sensor Cable
The PS series Motor integrates with two types of position sensor: absolute position sensor and
incremental position sensor. This alarm reports disconnection of the cable of these sensors.
◊
The Driver Unit reports disconnection of the absolute sensor cable only when the
control power is turned on.
◊
For the incremental position sensor, the alarm will be always made at an occurrence.
Table 11-9: Cause and semedy for the alarm A0
Cause Remedy
(1) Resolver cable disconnected.
•
Check the resolver cable for proper connection.
(2)
Defective resolver cable
(3) Defective resolve winding
•
Visually check the cable for damage.
•
Replace the Motor or the resolver cable if necessary. Refer to
“Appendix 2: How to Check Motor Condition”.
(4) Defective Driver Unit
•
If it does not recover with above measures, the Driver Unit may be
defective. Replace it referring to “Appendix 4: Procedure for
Replacing the EDC Driver Unit,” if necessary.
(1) Refer to “2.6.3. Cable Set” for the bending radius of the resolver cable. Refer to “2.6.1. PS
Series Megatorque Motor” for the resolver cable that is integrated with the Motor.
A too far small bending radius may cause a break in the cable.
(2) Do not fix the cable in the way that results in the force concentration on one area because it may
cause a cable break.
(3) When tie wrap the cables, be careful not to tie them tightly. Otherwise it may break inside of the
cables, even the cable itself look normally.
(4) When the cables are put in a cable carrier, the share of total cables shall be equal to or less than
50% of the inside area of a cable carrier. Do not put too much cable in it. Otherwise damage on
the cable coating may occur and may lead to internal cable break. Fix the cable to the cable
carrier at its entry and exit so that the force to the connecters is minimal.