Sears 113.2945 owner manual Probable Cause

TROUBLE SHOOTING CHART--MOTOR

NOTE: Motors used on wood-working tools are particularly susceptible to the accumula- tion of sawdust and wood chips and should be blown out or "vacuumed" frequently

to prevent interference with normal motor ventilation.

TROUBLE

Motor will not run.

Motor will not run and fuses "BLOW."

PROBABLE CAUSE

1.Protector open; circuit broken.

2.Low voltage.

1.Short circuit in line cord or

plug.

2.Short circuit in motor terminal box or loose connections.

REMEDY

1.	Reset protector by				pushing		in on red		button, located
	on top of motor junction box (indicated by audible
	click).
2.	Check	power		line for		proper		voltage.
1.	Inspect	line		cord and		plug	for damaged			insulation
	and shorted			wires.
2.	Inspect	all	terminals		in motor			terminal	box	for loose
	or shorted		terminals.

Motor fails to develop full power. (Power output of motor decreases rapidly with decrease in voltage at motor terminals.) For

example: a reduction of 10% in voltage causes a reduction of 19% in

maximum power output of which the motor is capable,

while a reduction of 20%

in voltage causes a reduc- tion of 36% in maximum

power output.

Motor starts slowly or fails to come up to full speed.

Motor overheats.

1. Power line overloaded with

lights, appliances and other motors.

2.Undersize wires or circuit too long.

3.General overloading of power company's facilities. (In many sections of the country, demand

for electrical power exceeds the capacity of existing gen- erating and distribution systems.)

4.Incorrect fuses in power line.

1.Low voltage--will not trip relay.

2.Starting relay not operating.

1.Motor overloaded.

2.Improper cooling. (Air circula- tion restricted through motor due to sawdust, etc.)

1.	Reduce	line	load.
2.	Increase	wire	sizes, or reduce	length	of wiring.
3.	Request	a voltage check from		the	power company.

4.Install correct fuses.

1.Correct low voltage condition.

2.Replace relay.

1.Correct overload condition.

2.Clean out sawdust to provide normal air circulation through motor.

Starting relay in motor will not operate.

1.Burned relay contacts (due to extended hold-in periods caused by low line voltage, etc.)

2.Open relay coil.

3.Loose or broken connections in motor terminal box.

1.Replace relay and check line voltage.

2.Replace relay.

3.Check and repair wiring.

Motor

stalls resulting in

1.

Starting

relay

not

operating.

1.

Replace

relay.

blown

fuses or tripped

2.

Voltage

too low to

permit

2.

Correct

the low

line voltage condition.

circuit

breakers.

motor

to

reach

operating

speed.

3.

Fuses or

circuit

breakers

do

3.

Replace

fuses or

circuit

breakers with proper capacity

not

have sufficient

capacity.

units.

Frequent

opening of fuses

1.

Motor

overloaded.

1.

Reduce

motor load.

or circuit

breakers.

2.

Fuses

or

circuit

breakers

do

2.

Replace

fuses or

circuit

breakers.

not

have

sufficient

capacity.

3.

Starting

relay

not

operating

3.

Replace

relay.

/motor does not reach normal

speed.)

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