POLYURETHANE
MACHINERY
CORPORATION
PH-2 SERVICE MANUAL
12. TROUBLESHOOTING
NOTE! IF THE DIRECTIONAL INDICATOR LIGHT (Q, Page
15) IS ON CHECK THE REVERSING VALVE COIL ON THE
SIDE THAT THE LIGHT IS ON. IF YOU HAVE 24 VOLTS DC
AT THE PLUG CHECK THE OHM’S RESISTANCE OF THE
COIL, IT SHOULD READ APPROXIMATELY 19 OHM’s, IF
NOT REPLACE THE COIL OR REVERSING VALVE. IF THE
DIRECTIONAL LIGHT IS OFF PROCEED BELOW.
NOTE! BEFORE TROUBLESHOOTING, THE REVERSING
PLATE MUST BE MOVED AWAY FROM THE SWITCH.
d. Bleed down the chemical pressures.
e. Ensure Pump Switch (P, section 5) is OFF.
f. Turn on the motor (X, section 5).
g. Go to the Directional Valve and locate the Actuation Coils. Located in the
middle of each coil is a small round tab that can be pushed in to manually
shift the spool to move the pumps. If the Reversing plate is all the way to
the left push in on the right side coil. If it’s all the way to the right side, push
in on the left side coil.
WARNING! THE MOTOR MUST BE OFF AND THE PUMP
SWITCH IN THE NORMAL POSITION.
h. Take a small screw driver or a thin piece of metal and move it across the front
of each Prox switch. A red light on the back of the switch should illuminate.
If not, replace the switch that does not light.
i. If the Prox switches light up, turn off all power and check for continuity on
both over pressure switches, pin 1 and 2. If the pressure switches are good,
go to the two solid state relays inside the console and interchange them, they
can be pulled from their housing. Power up the unit with the pump switch
in the normal position and the motor OFF. If the directional light comes on
replace the defective solid state relay. If not replace the Latching relay.
REVISION 1.2 39
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