GE PSH23SGNAFBS Series, Техническое обслуживание руководство, Страница: 21 / 45

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The evaporator fan has a 4-wire connection:
White Wire (DC Common)
The white wire is the DC common wire used for
testing. During repairs, DC polarity must be
observed. Reversing the DC polarity will cause a
shorted motor and/or board.
Red Wire (Supply)
Each motor uses an internal electronic controller
to operate the motor. Supply voltage from the
main control board remains at a constant 12 VDC.
Blue Wire (Feedback/RPM)
On previous Arctica models, the blue wire
reported rpm (speed) information to the main
control board for speed control purposes. On this
model, the board does not require nor read any
feedback information from the fan motor.
Yellow Wire (Signal)
The yellow wire is the input wire from the main
control board. The main control board provides
6.5 VDC effective voltage for low speed, 8 VDC
effective voltage for medium speed, and 9.5 VDC
for high speed. The fan will operate in low speed
only when the fresh food thermistor is satisfied.
Note: When testing these motors:
• You cannot test with an ohmmeter.
• DC common is not AC common.
• Verify 2 voltage potentials:
a. Red to white - power for internal controller
b. Yellow to white - power for fan
• Observe circuit polarity.
• Motors can be run for short periods using a
9-volt battery. Connect the white wire to the
negative (-) battery terminal only. Connect the
red and yellow wires to the positive (+) battery
terminal.