Read Panasonic FA-S280 Service Manual online
2-9
Operation
2.3.4
Lift Motor Driver Circuit
The lift motor is a DC motor that lifts up or down the bin holder. The motor is
driven by the motor driver IC11.
In addition to the thermal shut-down circuit incorporated in the motor driver IC, an
external overcurrent detection circuit is provided to shut down the power to the lift
motor.
It consists of photocoupler PC1, flip-flop IC and peripheral components. If, for
some reason, the lift motor keeps running and the bin holder runs over the upper
or lower limit, the bin holder mechanically stops.
In this case, as the lift motor spindle is locked, large current flows into the lift
motor. Then, the flip-flop is set via PC1 and the output of flip-flop becomes “H”. As
a result, the CPU stops the lift motor. Once this occurs, to reset the flip-flop,
power must be turned OFF.
VBB
SENS
OUTA
OUTB
IC11
Motor Driver
A3952SB
Motor Driver
A3952SB
10
16
+24V
11
15
15
A
B
[CPU PCB]
R1
R33
1
2
PC1
R24
3
4
C37 +
C36
VCC
D5
R20
R31
C26
R32
11
IC4
10
4
5
6
2
3
1
D7
R25
VCC
IC5
PR
CK
CL
Q
Q
D
+
CN7
DC+
DC–
Lift Motor
M
1
2
IC1 CPU
PB6
SD004
Click on the first or last page to see other FA-S280 service manuals if exist.