Circuit Breaker Is Tripping - Graco Magnum L10 Repair Manual

Specific Problem
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.
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.
332642C

Circuit Breaker is Tripping

Cause
Sprayer electrical wiring is
pinched or insulation is
damaged.
Wires between pressure
control switch and control
board are pinched.
Motor armature is shorting.
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.
Sprayer power cord damaged. 1. Unplug sprayer power cord.
Sprayer power switch
damaged.
Solution
Repair or replace any damaged wiring or
terminals. Securely reconnect wires.
Check for shorts. See Motor Diagnostics, page
27. If shorts are evident, replace motor using
Motor Kit. See List of Kits, page 30.
See Control Board Diagnostics, page 29.
Replace control board if damaged using Control
Board Kit. See List of Kits, page 30.
2. Disconnect brown and blue power cord wires
from EMI filter.
3. Plug in power cord.
4. Test voltage between brown and blue wires of
power cord. Meter must read 224-240 VAC.
5. Replace power cord if no voltage.
1. Unplug sprayer power cord.
2. Disconnect both wires from power switch.
3. Check for continuity between switch
terminals.
4. Toggle switch ON and OFF. There should be
continuity in the ON position only.
5. Replace power switch if no continuity in ON
position.
Advanced Troubleshooting
23