Graco XM PFP Setup & Operation page 66

Troubleshooting Information
Problem
Purge Controller right indicator does not
turn green. (Hazardous Location Models)
Purge Controller left indicator does not
turn green. (Hazardous Location Models)
Both purge controller indicators are green
but display screen does not turn on.
66
Cause
Leak in purge box or inadequate air sup-
ply.
Leak in purge box or obstructed purge
exhaust.
Obstructed air line or loose wiring.
Solution
Check purge box for leaks.
Make sure all cable glands are tight,
sensor and CAN cable glands include a
rubber grommet. Verify mounting screws
in purge controller are tight. Verify 8
mounting screw for explosion-proof box
are tight. Verify door latches are tight
and door mounting screws are tight.
Verify air regulator to purge
controller-mounted in front sprayer air
panel) is set to 80 psi. Verify no air
blockage to purge controller. Verify flow
control valve in purge controller is open.
Verify bottom port closest to purge
controller output is open. See Expo
manual for additional troubleshooting.
Check purge box for leaks. See above
for possible leak locations.
Verify pinch valves in purge controller
are all closed except for the 2 min pinch
valve. Verify no obstruction on purge
enclosure exhaust.
Verify air line between purge controller
(through flame arrestor) and pressure
switch in explosion proof box is not
obstructed.
Verify wiring is secure in explosion proof
box between the pressure switch
terminals and the contactor. Verify wiring
from explosion proof box to purge box
(large explosion proof bushing).
3A2776K