Graco XM 24W626 Operation Manual page 67

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.
3A2776H
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, sen-
sor and CAN cable glands include a rub-
ber grommet. Verify mounting screws in
purge controller are tight. Verify 8 mount-
ing screw for explosion-proof box are
tight. Verify door latches are tight and
door mounting screws are tight.
Verify air regulator to purge control-
ler-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 termi-
nals and the contactor. Verify wiring from
explosion proof box to purge box (large
explosion proof bushing).
Ratio by Weight Mode
Troubleshooting
67