Graco ULTRA AIRLESS 230-963 User Manual
Page 15
TYPE
OF
PROBLEM
ELECTRICAL SHORT
Buildino circuit breaker
as
as sprayer switch
is
turned on.
CAUTION
Any short in any part of
motor power circuit, which
connected to the output
of the bridge, will cause
bridge to burn out immediate
Correctly diagnose
ing and replacing bridge
repair all shorts before check,
as soon as sprayer is plugged
Building circuit breaker opens
turned on.
into outlet and sprayer is
WHAT
TO
CHECK
If
check
NOT
OK
refer t o this
col-
If
check
is
OK, go to
next check
WHAT TO
DO
umn
Check all electrical wiring for damaged
or damage. Be sure to check wires
insulation, and all terminals for loose
fit
ween pressure control and motor which
are encased in conduit
See page
29.
1.
Repair or replace any damaged wiring or
terminals. Securelv reconnect all wires.
,
Check for missing inspection plate
2. Correct faulty conditions.
gasket
bent terminal forks
which could cause a short.
or other metal to metal contact points
Check motor armature for shorts by us-
3.
Replace motor. See page
ing an armature tester (growler) or per-
form spin test. See page
15. Inspect
windings for bums.
,
Check bridge
by substituting with
4. Replace bridge. See page
a good bridge
or by performing bridge
test.
See page
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
Check
switch
See page
Be sure
the
sprayer
is
unplugged!
switch with ohm meter. The ohm meter
Disconnect wires from switch and check
should read
infinity
with the ONlOFF
switch OFF, and zero with the switch
ON.
CAUTION:
A short
in
the motor circuit
will burn the bridge out immediately,
which in turn usually causes the ONlOFF
switch
to
fail in the closed mode.
2. Replace
switch. See page
14
307-671