TROUBLE SHOOTING CHART--MOTOR
NOTE: Motors used on
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
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
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.) |
|
|
|
|
|
|
|
|
|
| |
19
