Graco ULTRA 1000 Instructions-Parts List Manual page 18

TYPE OF
PROBLEM
ELECTRICAL
SHORT
Building circuit breaker opens
as soon as sprayer switch is
turned on.
Any short in any parf of the
CAUTlON
motor power circuit, which is
connected to the output side
of the bridge, will cause the
ly. Correctly diagnose and
bridge to burn out immediate-
ing and replacing bridge.
repair all shorn before check-
as soon as sprayer
is
plugged
Building circuit breaker opens
into outlet and sprayer is NOT
turned on.
Sprayer circuit breaker opens
after sprayer operates for only
5 to 10 minutes.
. .
18 307-786
WHAT TO CHECK
If check is
OK,
go to next check
.
Check
all
electrical wiring for damaged in-
sulation, end all terminals for loose
fit
or
damage. Be sure to check wires between
pressure control and motor which are encas-
ed in conduit ( 2 2 ) . See page
29.
.
Check for missing inspection plate gasket
(see page
22).
bent terminal forks or other
m t a l to metal contact points which could
cause a short.
.
Check motor armature for shorts by using an
armature tester (growler) or perform spin
test.
See page 19. Inspect windings for
burns.
.
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 will immediately burn out
a
good
bridge.
_ .
.
Check 'Basic Electrical Problems' on page 14,
.
Check ONlOFF switch
( 3 0 3 1
See page
2 3 .
wires from switch and check switch with
Be sure the sprayer is unplugged1 Disconnen
ohm meter. The ohm meter should read in-
finity with the ON/OFF switch OFF, and zero
with the switch ON.
CAUTION: A short in tha motor circuit wil
burn the bridge
o u t
immediately. which in turr
usually causes the ON/OFF switch to fail in
thc
closed mode.
~ ~~~ ~~~
.
Check electrical supply with volt meter.
Meter should read 105 to 125 VAC.
.
Check tightness of pump packing nut. Over-
tightening nut tightens peckings on
rod,
restricts pump action, and damages
packings.
See
page
28.
.
Check stall pressure. Remove the plug from
the top of the fluid filter, and install a
5ooo
psi (360 bar) fluid-filled pressure gauge. See
page 2 ? . Plug in and turn on sprayer. Slowly
increase pressure setting to maximum. Pump
should s t a l l et 2800-3Mx) psi (196-xn bar).
Turn off end unplug sprayer.
I
After determining that there is no short in
system, reset circuit breaker button.
WHAT TO DO
When check is not OK refer to this columl
1. Repair
or
replace any damaged wiring or ter.
minals. Securelv rewnnect all wires.
2. Correct faulty conditions.
3.
Replace motor. See page
30.
4. Replace bridge. See page 24.
2. Replace ON/OFF switch. See page
2 3 .
1. If voltage is too high, do not operata sprayer
until corrected.
2.
Loosen packing nut. Check for leaking
around throat. Replace pump packings, if
necessary. See manual
307-793.
3. Calibrate pressure control.
See
page 27.
1. If circuit breaker continues to open (button
pops up), replace the circuit breaker. See
page 24.
.
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