96-8100 1-15-96
HAAS AUTOMATION, INC.
TROUBLESHOOTING
SERVICE
MANUAL
VF-SERIES
10
´ Lead screw noise.
l Ensure oil is getting to the lead screw through the lubrication system (See Air and Oil Diagrams). Look for a plugged
metering valve.
l Check for damage to the bearing sleeve.
NOTE: The current angular contact design sleeve has a fixed pre-load; it cannot be adjusted.
l Run the axis back and forth. The motor will get very hot if the bearing sleeve is damaged. If so, turn the axis by
hand and feel for roughness in the lead screw. Loosen the clamp nuts at both ends of the lead screw. If the symptom
disappears, replace the bearing sleeve. Be certain to check for damage to the lead screw shaft where the bearing sleeve
is mounted.
Ø If the noise persists, the lead screw is damaged and must be replaced. When replacing the lead
screw in an older machine, always replace the bearing sleeve with the current angular contact
design bearing sleeve.
l Check the lead screw for misalignment. If incorrect, perform alignment procedure.
l Misalignment in the lead screw itself will tend to cause the lead screw to tighten up and make excessive noise at both
ends of the travel. The ballnut may get hot. Misalignment radially at the yoke where the lead screw ball nut
mounts is indicated by heating up of the ball nut on the lead screw, and noise and tightness through out the travel of the
lead screw. Misalignment at the yoke where the ball nut mounts is indicated by noise and tightness at both ends of the
travel of the lead screw. The ball nut may get hot.
´ Noise in Z - Motion (VF-6)
Brake won't release (leadscrew won't rotate)
l alarm not cleared
l low pressure switch blown
l brake power fuse blown
l brake power transformer blown
l brake power rectifier blown
l cabling pinched
l brake failed
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