Southbend SB1029 owner manual Tr O U B L E S H O Oti N G

Model SB1029 TR O U B L E S H O OTI N G For Machines Mfg. Since 8/09

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	1.	No power; voltage is incorrect.	1.	Switch power supply ON/verify and correct voltage.
start.	2.	Blown fuse/tripped circuit breaker	2.	Correct the cause of overload, then reset/replace
		at main panel.		fuse or breaker.

3.Plug or receptacle is corroded or 3. Clean/retighten contacts; correct the wiring. mis-wired.

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 5. Trace/replace broken or corroded wires; fix loose

connections.	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 8. Test all legs for power, test field coil and replace if

		contacts.		at fault.
	9.	Motor at fault.	9.	Test for shorted windings, bad bearings and repair
				or replace.
Main motor chat-	1.	Extension cord (if used) is causing	1.	Move machine closer to the power source, or use a
ters during startup		voltage drop.		larger gauge wire or shorter extension cord.
or during opera-	2.	Phase converter (if used) wild wire	2.	Connect wild wire to the machine power supply
tion.
		connected wrong.		terminal that directly feeds motor. It must not feed
				current to contactor field coils or the transformer.

3.Power supply has incorrect voltage 3. Contact your power company to fix the power

		on one or more legs.		supply.
Machine operates	1.	Power connections wired out of	1.	Swap two power incoming power leads.
in reverse.		phase.
Machine has exces-	1.	Motor fan rubbing on fan cover.	1.	Fix/replace fan cover; replace loose or damaged fan.
sive vibration or	2.	Motor is loose.	2.	Tighten any loose fasteners.
noise.
	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.

Machine stalls or	1.	Motor is being overloaded.	1.	Reduce depth of cut.
slows when operat-	2.	Motor is wired out of phase.	2.	Swap two power incoming power leads.
ing.
	3.	Motor at fault.	3.	Test for shorted windings, bad bearings and repair
				or replace.
Handwheel has	1.	Leadscrew is dirty or lacks proper	1.	Clean and lubricate the leadscrew and service oil
excessive backlash,		lubrication.		system (Page 33).
end play, binds, or	2.	Longitudinal feed cable is loose.	2.	Adjust longitudinal feed cable (Page 35).
is difficult to move.

3.Linkage bolts, pins, and holes are 3. Replace linkage bolts, pins, and re-bush any worn

loose or worn. pin holes.

4.Leadscrew or leadscrew nut worn. 4. Replace leadscrew or leadscrew nut.

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