TM5-3820-256-10
Table 3-12. Fuses Blow when Motor Starts (Cont'd.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4.
CONTROL BOX
CAUTION
MALFUNCTION
Make the following checks with power shut off to the
control box.
Step 1. Check wiring
Contact Direct Support Mainte-
against diagram in con-
nance.
trol box. Check for
loose connections. Con-
trol box and motor must
be within same voltage
specifications.
Step 2. Check for de-
Contact Direct Support Mainte-
fective relay. Check
nance.
relay coil with an ohm-
meter. No movement
of needle (if capacitor
is good), indicates de-
fective relay point con-
tact.
Step 3. Check for de-
Contact Direct Support Mainte-
fective capacitor.
nance.
Check resistance across
capacitor terminals with
an ohmmeter. The
meter needle should
jump at first, then
fall back as the capa-
citor charges.
5.
PUMP IS BOUND.
Use an ammeter to help
A sand-bound pump may be corr-
determine the problem.
ected by reversing the pump
Amp readings 3 to 6
motor's red and black leads in
times higher than nor-
the control box. This reverses
mal indicate the pump
the pump's rotation, dispelling
may be bound. Locked
the sand. If the pump does not
rotor conditions can re-
rotate freely, it must be pulled
suit from misalignment
from the hole and cleaned or re-
between pump and motor
aligned and/or the well condition
caused by being wedged
corrected.
in a crooked well or
by rough handling at in-
stallation. Binding can
also result from the
rotor being locked up
by sand.
6.
DEFECTIVE CABLE
Attach one ohmmeter
The pump must be pulled and the
OR MOTOR WIND-
lead to the drop pipe
cable disconnected and inspected.
ING.
or well casing and
Damaged cable should be correct-
touch the other lead
ly spliced or replaced. If the
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