Electrical Short - Graco ULTRA AIRLESS 230-963 Instructions And Parts List

OF
TYPE PROBLEM

ELECTRICAL SHORT

Buildino circuit breaker ooens
as sooi as sprayer switch is
turned on.
CAUTION
Any short in any part of
thf
motor power circuit, which
connected to the output sidc
of the bridge, will cause
thf
bridge to burn out immediate
ly. Correctly diagnose anc
repair all shorts before check,
ing and replacing bridge
Building circuit breaker opens
as soon as sprayer is plugged
into outlet and sprayer is NO1
turned on.
14
307-671
TO
WHAT CHECK
i s
check OK, go to next check
If
Check all electrical wiring for damaged
insulation, and all terminals for loose
or damage. Be sure to check wires bet-
ween pressure control and motor which
are encased in conduit 141
2 9 .
i$
Check for missing inspection plate
,
2 7 ) .
gasket (see page bent terminal forks
or other metal to metal contact points
which could cause a short.
Check motor armature for shorts by us-
ing an armature tester (growler) or per-
form spin test. See page 15. Inspect
windings for bums.
( 3 0 8 1
Check bridge by substituting with
,
a good bridge or by performing bridge
See page
test. 16.
CAUTION: Do not perform this check
until armature is determined to be good.
A bad armature will immediately burn
out a good bridge.
Check 'Basic Electrical Problems' on
page
9.
Check ON/OFF switch 1302) See page
19. Be sure the sprayer is unplugged!
Disconnect wires from switch and check
switch with ohm meter. The ohm meter
should read infinity with the ONlOFF
switch OFF, and zero with the switch
ON.
A short in the motor circuit
CAUTION:
will burn the bridge out immediately,
which in turn usually causes the ONlOFF
switch to fail in the closed mode.
WHAT TO
I s
If check
umn
1. Repair or replace any damaged wiring or
terminals. Securelv reconnect all wires.
fit
I.
See page
2. Correct faulty conditions.
3.
Replace motor. See page
4. Replace bridge. See page
2. Replace ON/OFF switch. See page
DO
NOT OK refer t o this col-
29.
2 0 .
19.