Graco 231-032 A Series Instructions And Parts List page 18

ELECTRICAL SHORT
Building circuit breaker opens
turned on.
as
soon as sprayer switch is
Any short in any part of tht
CAUTION
motor power circuit, which i:
connected to the output sidt
of the bridge, will cause tht
bridge to burn out immediats
ly. Correctly diagnose an(
repair all shorts before check
ing and replacing bridge
as soon es sprayer is plugged
Building circuit breaker opens
turned on.
into outlet and sprayer is NO
after sprayer operates for on1
Sprayer circuit breaker opens
6 to 10 minutes.
-
WHAT TO CHECK
I f check i . OK, eo to next check1
I. Check a 1 1 electrical wiring for damaged in-
sulation, and all terminals for loose
fit
or
damage. Be sure to check wires between
pressure control and motor which ere ences-
ed in conduit
(22).
See pege
29.
1.
Check for missing inspection plate gasket
(see page 22). bent terminal forks or other
metal to metal contact points which could
cause e short.
3.
Check motor armature for shorts by using an
t e s t .
See page 19. Inspect windings for
armature tester (growler) or perform spin
burns.
1 . Check bridge (308) by substituting with a
good bridge or by performing bridge test.
See page
20.
CAUTION:
Do not perform this check until
armature is determined to be good. A bad
armature w i l l immediately bum out a good
bridge.
1. Check 'Basic Electrical Problems' on page 14
2. Check ONlOFF switch (303) See page
23.
Be sum the sprayer is unplugged1 Disconnec
wires from switch and check switch with
ohm meter. The ohm meter should read in-
with the switch ON.
finity with the ON/OFF switch OFF, and zerc
burn the bridge out immediately, which in turi
CAUTION:
A short in the motor circuit wil
usually ceuses the ON/OFF switch to fail
in
thl
closed mode.
1. Check electrical supply with volt meter.
Meter should read 105 to 125 VAC.
2. Check tightness of pump packing nut. Over-
tightening nut tightens packings on rod,
restricts pump action, and damages
-
packings.
See
page
28.
3. Check stall pressure. Remove the plug from
the top of the fluid filter, and install a 5ooo
psi (350 bar) fluid-filled pressure gauge.
See
A g e
27.
Plug in and turn on sprayer. Slowly
increase pressure setting to maximum. PumF
Turn off and unplug sprayer.
should s t a l l at 2560-2750 psi 1178195 bar).
system, r e a t circuit breaker button.
4. After determining that there is no short in
WHAT TO DO
When
c k k le
n o t
OK refer to this columr
1. Repair or replace any damaged wiring or ter-
minals. Securely reconnect all wires.
2. Correct faulty conditions.
3.
Replace motor. See page
30.
4. Replace bridge. See page 24.
2. Replace ONlOFF switch. See
page
23.
1. If voltage is too high,, do not operate sprayel
until corrected.
2. Loosen packing nut. Check for leaking
around throat. Replace pump packings, if
nBcB8881y. See manual 307-753.
3.
Calibrate pressure control.
See
page
2 7 .
4. If circuit breaker continues to open (button
pops up), replace the circuit breaker.
See
page 24.
Troubleshooting continued on next page
18
307-758