Haas Vector Drive Troubleshooting Manual page 7

Servo Amplifier - Troubleshooting Guide
Servo Motor Short Circuit Inspection
Review the Part Program
Corrective Action:
The machine load is too high. Decrease the feeds to decrease the machine load. Examine the cutting tool for damage.
Test the axis that generates the alarm. Write a program in MDI to move the axis. If any movement at any feed rate causes
the alarm, then the servo amplifier is at fault.
Low Voltage Inspection
Corrective Action:
Check the cables for a short: Make sure the axis
servo motor cables are not contaminated or
pinched. Contaminated or pinched cables can
cause a short. Replace the cables if necessary.
Inspect the servo motor. Disconnect and inspect
the power cable connector at the motor. Make sure
that there is no coolant contamination. Coolant
contamination can cause this alarm and damage
the amplifier. Measure the resistance from the pins
labeled A, B and C at the motor connector to
chassis ground.
• The reading should be OPEN.
• If there is not open resistance, the servo
motor is at fault.
Corrective Action:
Measure the low voltage power supply voltage
levels at the Maincon or Mocon PCB. Make sure
you do not short or cross your multimeter pins.
Cycle power to the machine. If the fault stays, then
the amplifier is faulty.
If every axis amplifier in the machine generates the
alarm at the same time, and the low voltage power
supply is correct, then the Maincon or Mocon PCB
may be at fault.
Page 7 of 8 pages