General Trouble Shooting - Promac 930VLB Instructions De Fonctionnement

10.2. General Trouble Shooting

Trouble
Spindle does not turn.
Spindle noisy.
Drill stalls.
Poorly drilled holes.
Motor overheating.
Table cannot be raised.
No speed readout.
Probable Cause
Motor overload protector tripped.
Circuit breaker tripped.
Branch circuit breaker tripped or fuse
blown.
Open wire in switch circuit.
Defective switch.
Broken drive belt.
Damaged spindle bearings.
Worn spline.
Worn drive belt.
Excessive feed rate for size of drill and
material being drilled. No cutting fluid or
improper cutting fluid.
Drill dull.
Lack of rigidity in hold-down method.
Speed too fast for material and drill size.
Feed too fast for material and drill size.
No or improper cutting fluid or coolant
being used.
Improperly ground drill bit.
Electrical circuit fault.
Oversize drill.
Excessive feed.
No cutting fluid, or wrong fluid.
Lack of lubrication.
Speed pickup out of adjustment or failed.
Remedy
Press motor overload reset button.
Reset circuit breaker.
Reset branch circuit breaker/replace fuse.
Repair open circuit.
Replace switch.
Replace drive belt.
Replace bearings.
Replace spline.
Check condition of belt. Replace if glazed
or slipping on pulleys.
Reduce feed pressure or use cutting fluid.
Use correct cutting fluid.
Sharpen drill.
Check that all T-slot hold-downs are tight
and that table-lock and drill head bolts are
tight.
Check spindle speed recommendations.
Reduce speed if necessary.
Reduce feed rate.
Use cutting fluid, or change to proper fluid
or coolant for material being drilled.
Check for proper angles and reliefs.
Regrind to proper geometry.
Check current draw in circuit. Make sure
current draw is the same as rating on
motor plate.
Reduce drill size.
Reduce feed rate.
Use correct cutting fluid for the material
and drill.
Lubricate.
Adjust gap between speed pickup and post
spindle pulley. If there is no readout on the
LED speed indicator after adjusting the
gap, replace the speed pickup.
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