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The W-21 remote control unit uses a radio
frequency signal to communicate with the RCM printed circuit
board which is located inside of the fan housing. Each
time you press a button on the W-21 a short 'package'
of instructions is sent to the RCM.
The 'package' of instructions contains:
The channel number identity code.
A complete set of fan operating
instructions.
You may have only changed the light intensity but the
signal sent to the RCM included all previously active
settings, i.e., fan speed, blade direction and light intensity.
The microprocessor in the RCM receives this 'package'
and then sends commands to the appropriate section of
the board. |
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The micr processor controls the direction of the motor through
a small reversing relay mounted on the RCM circuit board.
It controls the light drive section
of the RCM, which in turn controls the on/ off and dimming
range of the light fixture.
To control the speed of the motor, the microprocessor selects
one of six outputs, each of which turns on an electronic
switch known as a triac which is located on the RCM circuit
board. In high speed, a triac drives
the motor directly. In all other speeds, a triac drives
the motor through one or all five dropping resistors contained
within the BFR. This reduces power to the motor while maintaining
a pure sine wave drive.
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