30
PKGP-SVX19A-EN
Controller
twisted pair with shielding, and the twisting distance should not be more than 5cm.
● Hand-in-hand wiring requirements: each system module has two terminals A and B for RS485 connection, and the external
module has additional terminal G used to connect the shielding layer for the communication line except for terminals A and
B. The shielded twisted pair must be wired hand-in-hand, and star-shaped wiring is not allowed. That is, 1 connected to 2,
2 connected to 3, 3 connected to 4. Other connection is not correct, for example, 1 is connected to 2, 2 is connected to 3,
and 2 is connected back to 4, it is not correct.
● Shielding wiring requirements: the shielding layer is wrapped with adhesive tape after twisting to prevent it from being
connected to the ground of 220V, and one end of the shielding layer is connected to the grounding point G of the external
control cabinet. When connecting an external module, the shield is connected to terminal G. It is forbidden to connect to the
220/230V ground end of the iron sheet metal of the electric control box.
● When the network is unstable, add the network termination resistance of 120 ohms and 1uF in series, and install the
resistors between communication port A and port B of the last unit.
● When the power cable is wired parallel to the communication cable, certain distance must be maintained.
Installation Procedures
Power cable connection and communication cable connection, as follows:
1. Power cable connection: open the cover of the electric control box, make the power cable through the left wire entry hole
under the electric control box, connect the power cable live wire L and the switching power terminal L, the power supply
neutral line N and the switching power supply terminal N, and the grounding wire is connected to the grounding terminal.
Be sure to connect correctly according to the unit wiring diagram and make sure all connections are rm.
2. Communication cable connection: make the communication cable from the external unit through the right side of the wire
entry hole below, and connect it to the COM2 terminal block on the touch screen according to the following correspondence:
RS485 Line COM2 Terminal
A A
B B
Shielding layer No shielding layer
Max 16 OD units
RS485 Cable
RS485 Cable
MODBUS
Components Description:
1). The left side is the switching power supply
2). The right side is the touch screen
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