Southbend SB1023 manual Troubleshooting

Model SB1023 T R O U B L E S H O O T I N G For Machines Mfg. Since 8/09

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	1.	Power supply switched off/has	1.	Switch power supply on/verify voltage.
start.		incorrect voltage.
	2.	Blown fuse/tripped circuit breaker	2.	Correct the cause of overload, then reset/replace
		at main panel.		fuse or breaker.
	3.	Thermal overload relay has tripped.	3.	Allow motor to cool. If necessary, press reset button
				inside switch.
	4.	Plug or receptacle is corroded or	4.	Clean/retighten contacts; correct the wiring.
		mis-wired.
	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.
Motor chatters	1.	Extension cord (if used) is causing	1.	Move machine closer to the power source, or use a
during startup or		voltage drop.		larger gauge wire or shorter extension cord.
during operation.	2.	Low power supply voltage.	2.	Have the power supply verified and corrected by an
				electrician.
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 at fault.	2.	Test for shorted windings, bad bearings and repair
ing.
				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 30).
endplay, binds, or	2.	Leadscrew or leadscrew nut worn.	2.	Adjust or replace leadscrew or leadscrew nut.
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.	Longitudinal feed rack and pinion	4.	Replace rack and pinion gears.
		are worn.

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