NSK EDD Megatorque Motor - Warning F1: Excess Position Error

11. Alarm and Warning
— 11-16 —
11.3.16. Warning F1: Excess Position Error
 The position error means the difference between the position command to the Motor and the current Motor
position. (You can monitor the position error by the monitor TE/RP (Tell position error counter). This
warning occurs when the absolute value of position error is greater or equal to the threshold of parameter
CO (Position error counter over limit).
Table 11-23: Cause and remedy for the warning F1
Cause
Remedy
(1)
The motor does not respond to the
motion command.
 Confirm the combination of the Motor and the Driver Unit.
(2)
Excessive load
 Check for mechanical restraint that causes high friction resistance or lock of
the Motor.
 Reduce settings of parameters fro acceleration and deceleration.
parameters. (In case of pulse train command operation, reduce the
parameter settings of acceleration and deceleration to the pulse generating
controller.)
(3)
Interference of mechanical clump
(4)
Excessive acceleration and deceleration
(5)
The setting of CO data is too low.
 Firstly, check if the shipping set of CO200000 is maintained.
(The parameter CO isn’t necessarily to be 200000. It is rather set to the
specifications of machine into which the Megatorque Motor System is to be
incorporated.)
(6)
Poor tuning of servo parameters.
 Tune the servo parameters referring to “5. Tuning”,
(7)
The Motor is out of control.
 Confirm the combination of the Motor and the Driver Unit.
(8)
Defective cable, Motor, or Driver Unit.
 Follow “Appendix 2: How to Check Motor Condition.” Replace the cable
and/or the Motor if necessary.
 If above procedure does not work, the Driver Unit may be defective.
Replace it referring to “Appendix 5: Procedure for Replacing Driver Unit
Model EDD”.
(1) The input ACLR (alarm clear) or the command CL (Clear alarm) will clear the warning.