Troubleshooting - South bend SB1012 Owner's Manual

EVS Toolroom Lathes

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
Machine does not 1. (First time operation only) Lathe is
start or a circuit
breaker trips.
2. Emergency stop push-button is
3. Spindle ON/OFF switch is at fault.
4. Power supply is switched OFF at
5. Wall fuse/circuit breaker is blown/
6. Fuse has blown in machine
7. One or more kill switches are
8. Thermal overload relay has tripped.
9. Motor connection wired incorrectly.
10. Oil pump motor operating, but no
11. Limit/kill switch at fault.
12. Contactor not getting energized/has
13. Wiring is open/has high resistance.
14. Motor is at fault.
15. Frequency drive unit is at fault.
Loud, repetitious 1. Pulley set screws or keys are
noise coming from
lathe at or near the
2. Motor fan is hitting the cover.
motor.
Motor overheats. 1. Motor overloaded.
2. Frequency drive unit is at fault.
Motor is loud when 1. Excessive depth of cut or feed rate.
cutting, or bogs
2. Spindle speed or feed rate wrong for
down under load.
3. Cutting tool is dull.
-74-
TROU B LESHOOTI NG
Possible Cause
wired out of phase.
engaged or at fault.
main power switch or breaker.
tripped; short in electrical system;
start-up load too high for circuit.
electrical box due to thermal
overload.
engaged.
oil is seen pumping in sight glass.
burnt contacts.
missing or loose.
cutting operation.
For Machines Mfg. Since 7/09
Possible Solution
1. Correct out-of-phase wiring (refer to Page 17 for
details).
2. Rotate button clockwise until it pops out to reset it
for operation; replace if not working properly.
3. Move the spindle ON/OFF lever to ON; replace bad
switch.
4. Make sure main power switch and circuit breaker
are turned ON.
5. Verify circuit is rated for machine amp load;
troubleshoot and repair cause of overload; replace
weak breaker; find/repair electrical short.
6. Replace fuse; determine if overload is due to heavy
operation; ensure power source has high enough
voltage and cord is correctly sized.
7. Verify electrical box door, chuck guard, spindle,
and brake switches are not engaged. Verify that
headstock oil is pumping.
8. Turn the thermal relay cut-out dial to increase
working amps and push the reset pin. Replace if
tripped multiple times (weak relay).
9. Correct motor wiring connections.
10. Clean clogged tank suction screen, fill headstock oil
tank to full, or replace oil pump.
11. Test all limit/kill switches and replace as necessary.
12. Test for power on all legs and contactor operation.
Replace unit if faulty.
13. Check for broken wires or disconnected/corroded
connections, and repair/replace as necessary.
14. Test/repair/replace.
15. Contact frequency drive manufacturer for list of
authorized service providers in your area.
1. Inspect keys and set screws. Replace or tighten if
necessary.
2. Tighten fan, shim cover, or replace items.
1. Reduce load on motor.
2. Contact frequency drive manufacturer for list of
authorized service providers in your area.
1. Decrease depth of cut or feed rate.
2. Refer to the feeds and speeds charts in
Machinery's Handbook or a speeds and feeds
calculator on the internet.
3. Sharpen or replace the cutting tool.