User Manual Appendix A
GFK-1742F Jan 2020
Error Reporting 387
values and position loop gains (larger value Position Loop Time Constant) will
additionally reduce regenerated voltage levels.
OH (Over-heat Alarm): The temperature of the amplifier heat sink is too high or motor
temperature is excessive.
1.
Ambient temperature may be too high, consider a cooling fan for the servomotor.
Emerson supplies fan kits for most motors.
2.
The motor may be operating in violation of duty cycle restrictions. Calculate the
amount of cooling time needed based on the duty cycle curves published for the
particular motor.
3.
The motor may be over loaded. Check for excessive friction or binding in the
machine.
4.
For all the above problems, allow ten minutes cooling of the amplifier with minimum
or no motor loading then cycle amplifier power to reset.
FAL (Fan Alarm): The cooling fan has failed.
1.
Check the fan for obstructions or debris. With amplifier power removed attempt to
manually rotate the fan.
2.
For SVM type amplifier systems the power supply module (PSM) and the servo
amplifier module each include a cooling fan. The alarm code will indicate which unit
failed.
3.
Some amplifiers have field replaceable fan units. If a replacement fan unit is not
available, replace the amplifier.
HC, HCL, etc. (High Current Alarm): Motor current is excessive. For
α
Series amplifiers the
suffix (L, M, N, etc.) indicates which axis is in alarm
1.
Motor power wiring (U, V and W) may be shorted to ground or connected with
improper phase connections. Check the wiring and connections. Check the
servomotor for shorts to motor frame. Replace the motor if shorted.
2.
Improper motor type code may be configured or excessive values for tuning
parameters. Confirm that the proper motor is configured and lower gain values.
3.
The amplifier maintenance manual will describe the procedure for monitoring
motor current signals (IR and IS). If the waveforms are abnormal replace the
amplifier. If excessive noise is observed check grounds and especially the cable
shield grounds for the command cable (K1) to the amplifier.
4.
The motor may be operating in violation of duty cycle restrictions. Calculate the
amount of cooling time needed based on the duty cycle curves published for the
particular motor.
5.
The motor may be over loaded. Check for excessive friction or binding in the
machine.
6.
For all the above problems, allow ten minutes cooling of the amplifier with minimum
or no motor loading then cycle amplifier power to reset.
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