Read Panasonic FA-S280 Service Manual online
2-7
Operation
2.3.2
Encoder Sensor, Bin Bottom Sensor and Bin Top Sensor
(1) Encoder sensor
As the lift motor turns, the disk of the encoder ass’y which has a slit turns.
When the encoder sensor detects the slit, the light from the LED of the encoder
sensor reaches the phototransistor and “L” signal is output from the encoder
sensor.
By counting the “L” pulse, the CPU monitors the current position of the bin
holder.
(2) Bin bottom sensor
When the bin holder reaches the lower limit and the shutter of the bin holder
comes in the bin bottom sensor, the light from the LED of the bin bottom
sensor is blocked by the shutter and the output of the bin bottom sensor
becomes “H”. This position is the lowermost position of the bin holder and is
referred to the home position.
(3) Bin top sensor
When the bin holder reaches the upper limit, the shutter of the bin holder
comes in the bin top sensor. In this condition, the light from the LED is blocked
by the shutter and “H” is output from the bin top sensor.
VCC
RN2
CN4
Encoder
Sensor
Sensor
Bin
Top
Sensor
Top
Sensor
Bin
Bottom
Sensor
Bottom
Sensor
RN4
RN2
RN4
RN2
RN4
PA4
PA4
PA4
ANODE
ANODE
LOWER
STEP
GND
ANODE
UPPER
GND
GND
IC1 CPU
[CPU PCB]
1
2
3
4
5
6
7
8
9
6
5
4
SD002
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