NSK Megatorque PS Series, Руководство пользователя

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— 11-10 —
11.3.5. Warning A3: Software Thermal
The Driver Unit is estimating the heat generation and radiation of the Motor based on the current
flowing through the Motor windings.
The warning occurs when the estimation of heat generation exceeds the threshold.
Table 11-12: Cause and remedy for the warning A3
Cause Remedy
(1)
Unmatched combination of Motor
and Driver Unit.
•
Check for proper combination
(2) Excessive load
(3)
Mechanical restraint to the Motor such
as brake
(4) Excessive Motor duty cycle.
•
When this warning occurs within few seconds:
Check for mechanical restraint that causes high friction resistance
or locks the Motor motion.
•
Review load conditions. (Reduce load inertia.)
•
Increase idle time.
•
Readjust acceleration/deceleration parameters.
In case of the pulse train command operation, adjust the parameter
settings of master controller.)
(5)
Vibration caused by poor adjustment
of servo parameters
•
Set the servo parameters properly.
(Refer to “5. Tuning.”)
(6) Defective cable, Motor or Driver Unit
•
Follow “Appendix 2: How to Check Motor Condition” for
checking their conditions. Replace the cable or the Motor if
necessary.
•
If above procedures do not work, the Driver Unit may be defective.
Replace it referring to “Appendix 4: Procedure for Replacing the
EDC Driver Unit,” if necessary.
(1) Do not turn off the control power at the occurrence of this warning.
◊
If the control power is turned off, the estimated value of heat generation is cleared and
the Driver Unit won’t detect the existence of heat generation at the next power-on.
When this situation is repeated, the Driver Unit won’t be able to detect the warning
even the heat is actually accumulated to dangerous level.
(2) The input ACLR (Alarm clear) input or the command CL (Clear alarm) clears the warning.
However, it requires a sufficient air cooling of the Motor before resuming the operation because
the Motor winding remains in the high temperature state. It also requires removing the cause of
overheat as well.