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REV.-A
2.3.5
+24
VDC Voltage Control Circuit
Figure 2-11 shows the
+
24 VDC Voltage Control Circuit.
In order to maintain the correct voltage on the
+
24V line, the main switching transistor will go off if
the voltage exceeds 24V. If excess voltage occurs, reverse current will flow through Zener diode ZD20,
PC 1 will be activated, and the condition of the switching circuit will be as shown in Figure 2-12.
R4
0.63
2W
(1J)
le
R13
1.8K
RIO
2K
D5
--'---I~+24V
DC
ZD20
22V
GND
PCl
5(4)
r------ __ -_,
4 (2)
I
R12
I
3.6K 6(5):
I
I
: 3 ( 1)
L~
__ ·
.J
120 V Version
).... : 220/240 V Version
Figure 2-11.
+24
VDC Voltage Control Circuit
2-16
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