• DOK-DIAX02-DDS02.1*ANA-ANW1-EN-E1,44 • 12.96
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9. Diagnostics and fault clearance
"Motor encoder error"
The signals emitted by the motor encoder are monitored. If the signals
lie outside the tolerance window, this message will be signalled and the
main power cut out.
Cause:
– Defective or disconnected encoder cable
– Defective motor feedback.
Remedy:
Check the feedback cable. If no error can be found, replace the motor
(feedback defective).
Danger !
For drives with absolute encoder functions, make sure to set
the right absolute reference point when changing the motor
(refer to Section 7.9. "Absolute encoder parameters").
"Overcurrent"
Cause:
One of the three phase currents has risen to a level higher than 1.5 times
the unit’s rated current.
Remedy:
1. Check the current loop parameters. Consult INDRAMAT Service
Department.
2. Check the motor cable.
"Overvoltage"
The DC link circuit voltage has risen above the permissible level.
(Ud>475 V). The drive torque has been disabled in order not to risk
damaging the power output stage of the controller.
Cause:
The energy of a braking main spindle motor could not be converted
quickly enough by the installed bleeder resistors.
Remedy:
Flatten the gradient of the braking ramp for the main spindle or increase
the bleeder resistance by installing an additional bleeder.
See Section 8.3, Monitoring the recovered energy.
"Undervoltage error"
The DC link circuit voltage is monitored in the supply module. It signals
to the controller via the control voltage bus whether the link circuit voltage
is above the minimum permissible level of +200 V. If the voltage falls
below this level, the drive will be shut down according to the selected
error reaction.
Cause:
1. Mains power shutdown without first deactivating the drive by cancel-
ling the controller enable (RF) signal.
2. Malfunction of the supply unit.
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