Symptom Possible Cause Corrective Action
Amplifier detected a short. Check cables for contamination or damage.
Alarms 161-164 AXIS DRIVE
FAULT, Alarm 993 AMPLIFIER
SHORT CIRCUIT and 1.993 -
6.993
or
Alarm 2040 VECTOR DRIVE
OR SPINDLE AMPLIFIER-
SHORT CIRCUIT
The amplifier has a
internal short circuit.
Do the Amplifier Short Circuit Inspection section.
Note: If a short-circuit is found, inspect the cable and motor for a
short circuit before installing a new amplifier.
Alarms 161-164 AXIS DRIVE
FAULT and
Alarm 986 CALIBRATION FAULT
Amplifier internal
calibration.
Check the command cable from the Maincon / Mocon PCB to amplifier.
Check the 320 VDC voltage to amplifiers.
Alarms 161-164 AXIS DRIVE
FAULT and
Alarm 992 AMPLIFIER OVER
CURRENT
Axis mechanical
blockage.
Axis mechanical blockage.
Incorrect application. Change speed and check for tool damage.
Alarms 161-164 AXIS DRIVE
FAULT and
Alarm 994 AMPLIFIER OVER
LOAD
Axis mechanical
blockage.
Remove Blockage.
Alarms 161-164 AXIS DRIVE
FAULT and
Alarm 991 AMPLIFIER OVER
TEMPERATURE
Problem with the cooling
fan.
Check cooling fan.
Servo Amplifier - Troubleshooting Guide
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