Graco Reactor 2 H-30 Repair Parts page 41

4. Check functionality of the directional valve (207).
a. Confirm that the directional valve cable
is connected properly from HCM port 15
to the directional valve body (207) and
is not damaged. Inspect wiring inside
the cover of the directional valve. See
Electrical Schematics, page
b. During operation, the direction indicator lights
on the directional valve body (207) should
switch on based on the valve that is open.
c. Turn on the motor and stall the pumps at the
lowest pressure setting (compensator knob
turned fully counter-clockwise). The pump
will travel in either the A or B direction until
the pressure setting is reached.
d. Identify the solenoid that is operating by
viewing the direction indicator lights on the
cover of the directional valve (207). Measure
voltage across the associated terminals to
determine if proper voltage is reaching the
valve (approximately 200 to 240 VAC). See
Electrical Schematics, page
table below, to identify the proper terminals
to measure across.
e. Trigger each proximity switch (211) with
the shaft of a screwdriver, confirming each
solenoid within the directional valve (207)
operates as described in table below.
334946H
102.
102, and the
5. If you have determined that the cause is none
6. Check for loose or faulty proximity switch cable
7. Swap the cables to the proximity switches to see
8. Replace the HCM. See
f. If one or both sides are not operating
properly, according to the table, first
reconfirm wiring to directional valve (207)
per Electrical Schematics, page
replace directional valve (207).
For given given Pump driving
For For given Pump Pump
pump pump pump left left left (toward (toward (toward
movement park position) position)
movement movement park park position)
direction: direction: direction:
ADM indicates
Indicator light Left arrow,
on directional labeled "b"
valve cover
Last proximity Right side
switch proximity
triggered switch
Terminals in Terminals
directional associated
valve with red and
energized orange wires
NOTE: NOTE: For diagnostic purposes, it is possible to NOTE:
manually override the directional valve by using
a small screwdriver to depress the button in
the center of either directional valve end cap.
Depressing the button in the right end cap should
cause the pump to travel to the right. Depressing
the left button should cause the pump to travel
to the left.
of the previous possible causes, check for a
loose piston packing retaining bolt. This causes
the piston to contact the inner face of the pump
inlet flange before the switching plate activates
the proximity switch. Shut down the unit and
disassemble the appropriate pump for repair.
Following step step 1, 1, 1, if if if the the proximity proximity switch
Following Following step the proximity
lights lights lights do do not do not light: not light: light:
or connections. Confirm the connections to the
proximity switches are tight and internally free
from oil and other contaminates.
if the problem follows the switch or is in the cable.
Replace either the failed switch or the cable.
Troubleshooting
102, then
driving Pump driving driving
driving Pump Pump driving
right right (away right (away (away
from park park
from from park
position) position) position)
Right arrow,
labeled "a"
Left side
proximity
switch
Terminals
associated
with black and
white wires
switch indicating indicating
switch indicating
Replace HCM, page 70.
41