NSK Megatorque PS Series, User Manual, Page: 337 / 370

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11.3.23. Warning P0: Over Heat
The warning P0 occurs when temperature of the heat sink of the Driver Unit or the external dump
resistor has exceeded the threshold.
◊
This warning occurs when the continual current flow to the external dump resistor
elapsed over a period of 1 second due to excessive regeneration energy.
Table 11-32: Cause and remedy for the warning P0
Cause Remedy
(1)
Terminals SE+ and SE– of the
connector CN4 (Motor connector)
remain open even the external dump
resistor is not in use.
•
Short the terminal SE+ and SE– of the connector CN4 if the
external dump resistor is not used.
(2)
Ambient temperature of the Driver Unit
has exceeded 50[[°C]].
•
Confirm if the ambient temperature is less than 50[[°C]].
•
Review the environment the Driver unit is installed.
(3)
The power amplifier board has
applied the current to the Motor for
long enough to overheat its heat sink
exceeding 90[[°C]].
(4) Excessive load
(5) Excessive duty cycle of operation
•
Check if excessive friction force is applied due to interference with
the surrounding mechanism or the Motor is locked.
•
Reduce the load moment of inertia.
•
Review the rate of operating time and idle time. (Increase idle
time.)
•
Reduce the parameter settings of acceleration and deceleration.
In case of the pulse train command positioning, reduce those of the
master controller.
•
Lower the Motor velocity.
(6)
Caused vibration due to poor tuning
of servo parameters.
•
Refer to “5. Tuning”.
(7) Defective Cable, Motor or Driver Unit
•
Check the Motor condition referring to “Appendix 2: How to
Check Motor Condition”. Replace the cable or the Motor if
necessary.
If above measures do not work, the Driver Unit may be defective.
Replace it referring to “Appendix 3: Procedure for Replacing EDC
Driver Unit.”
(1) If the thermo sensor remains ON, the warning occurs again when the power is turned on.
11.3.24. Alarm P1: Main Power Overvoltage
The Driver Unit checks the voltage in the power amplifier and gives an alarm when it exceeds the
specified value.
◊
Following are the cause of the increase in the voltage of power amplifier: the riding
main power voltage supplied externally and the rising voltage caused by the
regeneration energy
Table 11-33: Cause and remedy for the alarm P1
Cause Remedy
(1)
Commutation voltage of the main
power has ex 390 [V]
(correspond to 275 [V] volts) due to
the higher voltage than the
specification is applied.
•
Immediately shut down the main power.
•
Confirm the main power voltage and turn on the power again.
(2)
High moment of inertia of the load is
decelerated with extremely high
deceleration and resulted in the
same situation above.
•
Immediately shut off the main power.
•
Reduce the moment of inertia.
•
Reduce the settings of acceleration and deceleration.
•
Review the use of an external dump resistor. Refer to “Appendix 5:
Dump Resistor.”
(3)
Defective Cable, Motor or Driver
Unit.
•
Check the Motor and the Cable referring to “Appendix 2: how to
Check Motor Condition” and replace them if necessary.
•
If the above measures do not work, the Driver Unit may be
defective. Replace it referring to “Appendix 4: Procedure for
Replacing Driver Unit”.