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TROUBLESHOOTING
-36-
For Machines Mfg. Since 8/09
Model SB1029
TROUBLESHOOTING
If you need replacement parts, or if you are unsure how to do any of the solutions given here, feel free
to call us at (360) 734-1540.
Symptom Possible Cause Possible Solution
Machine does not
start.
1.
No power; voltage is incorrect.
1.
Switch power supply ON/verify and correct voltage.
2.
Blown fuse/tripped circuit breaker
at main panel.
2.
Correct the cause of overload, then reset/replace
fuse or breaker.
3.
Plug or receptacle is corroded or
mis-wired.
3.
Clean/retighten contacts; correct the wiring.
4.
Thermal overload relay has tripped.
4.
Allow motor to cool. If necessary, press reset button
inside switch.
5.
Break or short in wiring; or loose
connections.
5.
Trace/replace broken or corroded wires; fix loose
connections.
6.
Motor ON/OFF switch at fault.
6.
Replace switch.
7.
Motor connection wired incorrectly.
7.
Wire motor correctly (refer to inside junction box
cover or manual).
8.
Contactor not energized/has poor
contacts.
8.
Test all legs for power, test field coil and replace if
at fault.
9.
Motor at fault.
9.
Test for shorted windings, bad bearings and repair
or replace.
Machine has exces-
sive vibration or
noise.
1.
Motor fan rubbing on fan cover.
1.
Fix/replace fan cover; replace loose or damaged fan.
2.
Motor is loose.
2.
Tighten any loose fasteners.
3.
Grinding wheel out of balance.
3.
Dress and balance grinding wheel.
4.
Motor bearings worn or damaged.
4.
Replace motor bearings or replace motor.
Main motor chat-
ters during startup
or during opera-
tion.
1.
Extension cord (if used) is causing
voltage drop.
1.
Move machine closer to the power source, or use a
larger gauge wire or shorter extension cord.
2.
Phase converter (if used) wild wire
connected wrong.
2.
Connect wild wire to the machine power supply
terminal that directly feeds motor. It must not feed
current to contactor field coils or the transformer.
3.
Power supply has incorrect voltage
on one or more legs.
3.
Contact your power company to fix the power
supply.
Machine operates
in reverse.
1.
Power connections wired out of
phase.
1.
Swap two power incoming power leads.
Handwheel has
excessive backlash,
end play, binds, or
is difficult to move.
1.
Leadscrew is dirty or lacks proper
lubrication.
1.
Clean and lubricate the leadscrew and service oil
system (Page 33).
2.
Longitudinal feed cable is loose.
2.
Adjust longitudinal feed cable (Page 35).
3.
Linkage bolts, pins, and holes are
loose or worn.
3.
Replace linkage bolts, pins, and re-bush any worn
pin holes.
4.
Leadscrew or leadscrew nut worn.
4.
Replace leadscrew or leadscrew nut.
Machine stalls or
slows when operat-
ing.
1.
Motor is being overloaded.
1.
Reduce depth of cut.
2.
Motor is wired out of phase.
2.
Swap two power incoming power leads.
3.
Motor at fault.
3.
Test for shorted windings, bad bearings and repair
or replace.