NSK EDD Megatorque Motor - Alarm A1: Position Data Error; Alarm A2: Motor Cable Disconnected

11. Alarm and Warning
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11.3.3. Alarm A1: Position Data Error
 When the control power of the Driver Unit is turned on, the System checks the absolute position of the
Motor.
This alarm reports that the checking of Motor position does not have properly executed because the Motor
moved when the control power was turned on.
Table 11-10: Cause and remedy for the alarm A1
Cause
Remedy
(1)
The Motor moved when the
power is on.
 Reset the power (Off  On).
(2)
Defective cable, Motor, or Driver
Unit. .
 Follow the checking described in “Appendix 2: How to Check Motor
Condition” to check the Cables and the Motor. Replace them if necessary.
 If above check is not satisfactory, it may require replacing the Driver Unit.
Refer to “Appendix 5: Procedure for Replacing Driver Unit Model EDD,”
and replace it.
(1) If the Motor moves because of motion of other unit and thus the alarm occurs, change the timing of turning
on the control power of the Driver Unit.
11.3.4. Alarm A2: Motor Cable Disconnected
 The Driver Unit supplies to the Motor winding for its rotation.
The alarm occurs when the current does not flow through the Motor winding even the command for the
Motor motion has been inputted, and thus detects a break in the motor cable.
Table 11-11: Cause and remedy for the alarm A2
Cause
Remedy
(1)
Motor cable disconnected.
 Check the Motor cable for proper connection.
(2)
Defective Motor cable
 Visually check the cable for damage.
 Replace the Motor or the Motor cable if necessary. Refer to “Appendix 2:
How to Check Motor Condition”.
(3)
Defective Motor winding
(4)
Defective Driver Unit
 If it does not recover with above measures, the Driver Unit may be
defective. Replace it referring to “Appendix 5: Procedure for Replacing
Driver Unit Model EDD,” if necessary.
(1) Refer to “2.6.3. Cable Set” for the bending radius of the Motor cable. Refer to “2.6.1. Megatorque
Motors” for the Motor 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 their outside 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.