POLYURETHANE
MACHINERY
CORPORATION
PH-2 SERVICE MANUAL
12. TROUBLESHOOTING
4. Check that the tap setting on the transformer is set for the proper hose length.
If it is set correctly, move to the next step.
5. To check the secondary side of the transformer, you must take an AC volt reading
across the two leads coming out of the transformer that are connected to the
“A” and “R” hose leads. If you are reading voltage (your volt reading will vary
depending on what tap setting is used), most likely the problem is in the heated
hose. Either a connector has come loose or there is a broken wire.
6. Because the gun whip takes the most abuse, it is most likely the whip that has
failed. Disconnect the crossover wires on the machine end of the whip hose and
connect the two wires together coming off the 50’ section. Turn on the hose heat
and see if the hose heat circuit is operating; if so replace the whip. To take a
continuity reading through the heated hose, one of the leads from the transformer
to the “A” or “R” heated hose must be disconnected.
If no voltage is coming out of the transformer to the heated hose, move
on to the next step.
7. Open the right side of the tank (where the transformer is located) and locate the
solid state relay for the hose circuit (EL-35). With the hose turned on and the
LED light illuminated on the relay, take a volt meter (set on DC) and measure
across position A1 and A2; your reading should be 24 volts. Then take an AC volts
measurement across position L1 and L2 (heavy wires). With the relay functioning
properly you should have a 1 volt Reading. If the Reading is 18 to 90 volts AC,
the relay has malfunctioned and needs to be replaced. If the AC Reading across
L1 and L2 is .025 volts check the over temperature switches in the heaters. A
defective over temperature switch will open a contactor disabling both Heaters
and the Hose.
If there is no light on the solid state relay, move to the next step.
8. Using a DC volt meter, measure across position 5 and 6 on the back of the hose
controller. This is the output of the controller and sends power to the solid state
relay. Your reading will be 4-6 volts DC. If there is no voltage, check to make
sure that the set temperature of the controller is above ambient temperature.
Before replacing the controller, read across position 1 and 2 to make sure that the
controller is powered up; your reading will be 208 to 230 volts AC.
If there is no DC voltage to the relay, move to the next step.
• Problem: Hose does not heat and the display on the controller shows an error message
(SbEr).
Solutions:
1. Check position 6 and 7 on the heater controller for loose wires.
If the wires are tight, move to the next step.
2. Remove the transformer cover and check that the thermocouple wires are secure
to the harness going up to the controller. If there are no loose connections, discon-
nect the wire from the TSU and connect it directly to the thermocouple harness
REVISION 1.2 43
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