POLYURETHANE
MACHINERY
CORPORATION
PH-2 SERVICE MANUAL
12. TROUBLESHOOTING
• Problem: Primary heater does not heat and the display on the controller shows
ambient temperature.
Solutions:
1. Check that the light on the on/off switch is lit when the heater is turned on, if
not replace the switch.
If the light is on, move to the next step.
2. Check the heater breaker in the main console and reset the breaker. If it continues
to trip, wrap an Amp Clamp around one of the wires coming off the breaker. If
the Amperage reading does not exceed the rating of the breaker, the breaker needs
to be replaced. If the breaker draws more than its rating the most likely cause is
that one or more of the fire rods located in the heater are shorted.
If the breaker is not tripped, move on to the next step.
3. Open the console top and locate the solid state relays for the heaters, looking over
the console top from the front of the machine. There are two relays to the left
bottom of the console, the one to the far left is for the “A” heater and the one to
the right is for the “R” heater. With the heater on, look to see if an LED light is
lit on the relay.
If there is no LED light on the solid state relay, move to the next step.
4. With a DC volt meter read across position A1 and A2 on the solid state relay
(smaller wires) if you have a reading of 4-6 volts DC and the AC reading across
L1 and L2 (Heavy wires) reads 208-230 volts AC replace the solid state relay.
With 4-6 volts DC at A1 and A2 the proper reading should be 1 volt AC across
L1 and L2. A defective over temperature switch will open a contactor disabling
both Heaters and the Hose.
If there is no DC voltage to the relay, move to the next step.
5. Check the M1 contactor to ensure it is activated. If not, inspect the contactor for
failure.
If the M1 contactor is activated, move to the next step.
6. Using a DC volt meter, on an Eaton Controller measure across position 5 and 9 on
the back of the heater controller. On an Omron Controller measure across position
5 and 6 on the back of the heater controller. This is the output of the controller
and sends power to the solid state relay. On an Eaton Controller, your reading
will be 4-6 volts DC. On an Omron Controller, your reading will be 12 volts DC.
If there is no reading check to make sure that the set temperature of the controller
is above the actual temperature reading on the controller. 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 voltage detected; check
for loose wires or a malfunction of the heater circuit breaker.
REVISION 1.2 34
To Next Page
Loading...
