B&D Mfg Smart - Manual (Page 18)

18
ALL THE PUMP YOU NEED AND MORE
Revised 7-5-12
Motor Testing
Evaluation –
If all ohm values are normal, the motor windings are neither shorted nor open.
If any one ohm value is less than normal, then that motor winding may be starting
to short. If any one ohm value is greater than normal, then that winding may be
starting to open. If some ohm values are greater than normal (more than 25%),
then the leads may be connected incorrectly.
Motor Winding Resistance –
(Lead to Lead)
1. Turn the power “OFF”.
2. Disconnect all electrical leads to motor.
3. Set the scale selector on the ohmmeter
to R x 1 (if you expect ohm values under
10 or R x 10 (for ohm values over 10).
4. Touch the leads of the ohmmeter to the
two motor leads. Touching the leads of
the ohmmeter to any two hot leads will
measure the winding’s resistance. Repeat
for all three possible lead combinations
(L1 and L2; L2 and L3; L1 and L3).
5. Watch the ohmmeter scale and compare
this figure with the appropriate chart.
Insulation Resistance –
(Lead to Ground)
1. Turn the power “OFF”.
2. Disconnect all electrical leads to motor.
3. Set the scale selector on the
megohmmeter to R x 100, touch its leads
together and adjust the indicator to zero.
4. Touch the leads of the megohmmeter to
each of the motor leads as you connect
to the ground (i.e. L1 to ground, then L2
to ground, etc.).
5. Watch the megohmmeter scale and
compare this figure with the appropriate
chart.
Evaluation –
The resistance values of new motors must exceed 1,000,000 ohms.
If they do not, replace the motor.