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SECTION VIII
PHASE 7 DUAL MICROPROCESSOR CONTROLLER (DMC)
COMPUTER SYSTEM DIAGNOSTICS
IMPORTANT: YOU MUST DISCONNECT AND LOCK OUT THE ELECTRIC SUPPLY
AND THE GAS OR STEAM SUPPLY BEFORE ANY COVERS OR
GUARDS ARE REMOVED FROM THE MACHINE, TO ALLOW ACCESS
FOR CLEANING, ADJUSTING, INSTALLATION, OR TESTING OF ANY
EQUIPMENT PER OSHA (Occupational Safety and Health Administration)
STANDARDS.
ALL major circuits, including the door, the microprocessor temperature sensor, and the heat and motor circuits
are monitored. The Phase 7 dual microprocessor controller (DMC) computer will inform the user via the liquid
crystal display (L.C.D.) of certain failure messages, along with light emitting diode (L.E.D.) indicators on the
Inputs/Outputs (I/O) on the Phase 7 DMC (computer) board.
ERROR MESSAGES:
NOTE: Any error associated with the “Out of Order” message can be identified by pressing the
“LO” key while in the “Out of Order” condition. If the “HI” key is pressed during
this time, the remaining credit can be viewed. Any “Out of Order” message is
immediately followed by a 3-second tone. If the fault has been corrected, holding the
“PAUSE” key for 3-seconds will clear the fault message. If more than one (1) fault
occurred at the same time after the first fault is cleared, the next fault will be displayed and will
need to be cleared. This will occur until ALL faults have been displayed. In Free Mode,
the Phase 7 DMC (computer) will not display “Out of Order”; it will just display the fault.
A. DIAGNOSTIC L.C.D. FAULT MESSAGES
MODEL FAULT – This routine monitors the inputs, such as the sail switch and gas valve, to determine the type
of dryer the Phase 7 DMC (computer) is. Steam dryers DO NOT use a sail switch or valve input, and an electric
dryer will not use a gas valve input. These signals allow the Phase 7 DMC (computer) to interpret what type of
dryer it is controlling. The Phase 7 DMC (computer) determines what the expected dryer responses should be
for that specific heat-type dryer. Anytime a model fault is detected, the Phase 7 DMC (computer) will interrupt
the cycle and will display “MODEL FAULT” and will go into a Fault Mode with a brief audio indication. If the
basket (tumbler) temperature is above 100°F (38°C) at the time of the failure, the Phase 7 DMC (computer) will
continue to display “MODEL FAULT” while the dryer cools by running with no heat for 3 minutes or until the
temperature drops below 100°F (38°C). Once the basket (tumbler) temperature is below 100°F (38°C), or the
3 minutes expire, the Phase 7 DMC (computer) will shut off ALL outputs and will remain in Fault Mode until the
dryer is addressed.
NOTE: If a model error occurs, the microprocessor will always default to the “gas” type for safety
reasons. Also, the dryer is stopped and forced into a restart condition to reevaluate ALL
expected responses.