Chapter 4 Electrical Installation Shenzhen Hpmont Technology Co., Ltd
―22― HD5L Series Controller User Manual
Dry contact connections
1. If the internal 24V power supply is used, the connection is as shown in Figure 4-7. (The SEL
and the P24 are short-circuited at factory)
Figure 4-7 Dry contact connection when using internal 24V power
2. If the external power supply is used, the connection is as shown in Figure 4-8. (Note that the
SEL and the P24 are not short-circuited)
Figure 4-8 Dry contact connection when using external power
+ 3.3V
+
-
R
+ 24V
COM
P24
SEL
K
DI1...DI6
Current
Dry contact connection
using internal power
+ 3.3V
+
-
R
+ 24V
COM
P24
SEL
K
DI1...DI6
+
-
12－30V
DC
Current
Dry contact connection
using external power
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