Troubleshooting - South bend SB1050F Manual

13" Heavy 13 Gearhead Lathe
®
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. STOP button is engaged or at fault.
3. Spindle switch(es) are 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 safety switches or
8. Thermal overload relay has tripped.
9. Motor connection wired incorrectly.
10. Safety/brake switch(es) at fault.
11. Contactor not getting energized/has
12. Wiring is open/has high resistance.
13. Motor 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.
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.
-84-
TROU B LESHOOTI NG
Possible Cause
wired out of phase.
master power switch or breaker.
tripped; short in electrical system;
start-up load too high for circuit.
electrical box.
brake switch are engaged.
burned contacts.
missing or loose.
cutting operation.
For Machines Mfg. Since 5/11
Possible Solution
1. Swap two hot wire connections on master switch
(see Page 25).
2. Rotate button clockwise until it pops out to reset it
for operation; replace if not working properly.
3. Replace bad switch(es).
4. Make sure master 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 power cord is correctly sized.
7. Verify electrical box door, chuck guard, spindle, and
brake switches are not engaged.
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. Test all switches and replace as necessary.
11. Test for power on all legs and contactor operation.
Replace unit if faulty.
12. Check for broken wires or disconnected/corroded
connections, and repair/replace as necessary.
13. Test/repair/replace.
1. Inspect keys and set screws. Replace or tighten if
necessary.
2. Tighten fan, shim cover, or replace items.
1. Reduce load on motor.
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.