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c) Front Doors Closed circuit branch.
There are two (2) magnetic proximity switches mounted in the door closed position and a magnet
mounted on top of the doors. When this magnet aligns with the proximity switch, the contacts in
the proximity switch close. When both doors are closed, the front doors closed relay (CR2) turns
on.
(1) There are two (2) sets of contacts in the relay...one (1) set of contacts are in the dry enable
circuit branch and the other set go to the PLC input front doors closed.
d) Lint Drawer Closed circuit branch ...
The lint drawer closed switch is located in the front of the dryer. When the lint drawer is closed,
it closes the switch contacts, powering the lint drawer closed relay. Then, the dry enable relay
will close, supplying 24 VAC to the Phase 5 microprocessor (computer) door signal. This sequence
will occur only if the following conditions are met;
(1) Blower (impellor/fan) Motor Overload is not tripped.
(2) Drive (tumbler/basket) Motor Overload is not tripped.
(3) Dryer is level.
(4) Lint Drawer is closed.
(5) Doors are closed.
b. Phase 5 Microprocessor Controller (computer)
1) The Phase 5 Microprocessor Controller (computer) is powered by 240 VAC on Pin #7 and Pin #13.
A jumper wire on Pin #1 to Pin #11 is required to configure the Phase 5 microprocessor (computer)
for 240 VAC. The temperature sensor probe is a bullet shaped device that is located above the lint
basket. This temperature probe is used to sense the temperature in the exhaust of the dryer. The
temperature sensor is a two (2) terminal monolithic integrated circuit temperature transducer that
provides an output current proportional to absolute temperature. The transducer acts as a high impedance
temperature dependant current source of 1µA/ºK. The typical accuracy of this probe is +/- 2.7º F
(+/- 1.5º C). In a case where the temperature reaches 220º F (104º C), the Phase 5 microprocessor
(computer) will shut down and the L.E.D. (light emitting diode) will display "Hot". To restart a cycle
the "CLEAR/STOP" button must first be pressed.
ºF =
9
(ºC + 32)
5
ºC =
5
(ºF - 32)
9
T
EMPERATURE
S
ENSOR
C
URRENT
=
ºC + ºK (273.15)
=
MICROAMPS
(µA)
1,000,000