Graco LTS 15, Repair And Parts Manual

Page: 21 / 54

Advanced Troubleshooting
313036N 21
General Problem: Circuit Breaker is Tripping
Specific Problem Cause Solution
Building circuit breaker opens
as soon as sprayer is turned
on.
NOTE: Remove enclosure
mounting screws and pull
enclosure away from drive
housing. Take care not to pull
on leads from electrical cord
and power switch.
Sprayer electrical wiring is
pinched or insulation is dam-
aged. Repair or replace any damaged wiring or termi-
nals. Securely reconnect wires.
Wires between pressure con-
trol switch and control board
are pinched.
Motor armature is shorting.
Check for shorts. See Motor Diagnostics , page
25. If shorts are evident, replace motor using
Motor Kit , page 28.
Control board is damaged.
CAUTION: Do not perform
control board diagnostics until
you have determined the
armature is good. A bad
motor armature can burn out
a good motor control board.
See Control Board Diagnostics , page 27.
Replace control board if damaged using Control
Board Kit , page 28.
Building circuit breaker opens
as soon as sprayer is plugged
into outlet and sprayer is NOT
turned on.
NOTE: Remove enclosure
mounting screws and pull
enclosure away from drive
housing. Take care not to pull
on leads from electrical cord
and power switch.
Sprayer power cord dam-
aged. Unplug sprayer power cord.
Disconnect black power cord wire at power
switch.
Unplug in-line connection white cord wire.
Plug in power cord.
Test voltage between black and white wires of
power cord. Meter must read 85 to 130V AC.
Replace power cord if no voltage.
Sprayer power switch dam-
aged.
1. Unplug sprayer power cord.
2. Disconnect black control board wire at power
switch.
3. Unplug in-line connection white cord wire.
4. Plug in power cord.
5. Turn power switch ON.
6. Test voltage between open terminal of power
switch and white power cord wire. Meter must
read 85 to 130V AC.
7. Replace power switch if no voltage.
Also see Basic Electrical Problems, and Sprayer Wiring Problems , pages 19 - 20.