96-8100 1-15-96
HAAS AUTOMATION, INC.
TROUBLESHOOTING
SERVICE
MANUAL
VF-SERIES
14
3.4 VIBRATION
´ Excessive servo motor vibration.
l If no A axis is present, swap the suspected bad servo motor with the A driver and check to see if there is a driver
problem. If needed, replace the DRIVER PCB ("Electrical Service" section).
l Check all Parameters of the suspected axis against the Parameters as shipped with the machine. If there are any differ
ences, correct those and determine how the Parameters were changed. PARAMETER LOCK should normally be on.
l A bad motor can cause vibration if there is an open or short in the motor. A short would normally cause a GROUND
FAULT or OVERCURRENT alarm; check the ALARMS. An ohmmeter applied to the motor leads should show between 1
and 3 ohms between leads, and over 1 megohm from leads to chassis. If the motor is open or shorted, replace.
3.5 OVERHEATING
´ Servo motor overheating.
l If a motor OVERHEAT alarm occurs (ALARMS 135-138), check the Parameters for an incorrect setting. Axis flags in
Parameters 1, 15, or 29 can invert the overheat switch (OVER TEMP NC).
l If the motor is actually getting hot to the touch, there is excessive load on the motor. Check the users application for ex
cessive load or high duty cycle. Check the lead screw for binding ("Accuracy/Backlash" section). If the motor is
binding by itself, replace in accordance with "Axis Motor Removal/Installation".
3.6 FOLLOWING ERROR
´ Following error alarms occur on one or more axes sporadically.
l Check DC bus voltage on diagnostics page #2. Verify this voltage on the drive cards in the control panel. If it is at the
low side of the recommended voltages, change the transformer tap to the next lower voltage group as explained in the
Installation Manual.
l Check motor wiring.
l Replace driver card ("Electrical Service").
l Replace servo motor ("Axis Motor Removal/Installation").
´ Z-axis motor overcurrent (VF-6)
l Brake won't release (leadscrew won't rotate)
Ø alarm not cleared
Ø low pressure switch blown
Ø brake power fuse blown
Ø brake power transformer blown
Ø brake power rectifier blown
Ø cabling pinched
Ø brake failed
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