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How To Use the Terminals
Controller Power Supply
Terminals
RE ADY
SD/ RD
SW 1
OCC
SW 2
ERRO R
Load Power Supply Input
Terminals
RE ADY
SD/ RD
SW 1
OCC
SW 2
ERRO R
Communications
Terminals
RE ADY
SD/ RD
SW 1
OCC
SW 2
ERRO R
10
In the wiring diagrams, the area within the lines indicating terminals numbers
is inside the G3ZA and the area outside the lines are outside the G3ZA.
• Connect terminals 1 and 2 as follows:
1
2
• The input power is 100 to 240 VAC.
• To detect the zero-cross point of the load supply, connect the load power
supply to terminals 4 and 6 as follows:
4
6
The voltage of the load power supply that can be connected depends on
the model of the Controller.
100 to 240 VAC or 400 to 480 VAC
• The G3ZA detects the zero cross point of the load power supply.
• To communicate with a host system, connect the communications line to
terminals 7 and 8 as follows:
7
8
B
A
(+)
(- )
RS-485
• The connection type can be 1: 1 or 1: N. For 1: N connections, up to 32
Units can be connected, including the host.
• The maximum cable length is 500 m total.
Cable Diagram (Reference)
• Use shielded twisted-pair cables (AWG28 to AWG16).
• A terminator must be connected to both ends of the communications path
(including the PLC). Use a resistance of 100 to 125 Ω (1/2 W) in the termi-
nators.
• Use an RS-232C/RS-485 converter to connect to a personal computer or
other host with an RS-232C connection.
AWG28
Cross-sectional area of core:
2
0.081 mm
min.
Section 2-2
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