Omron NS5-SQ00 V2 Series - A-3-6 Handling the Shield on RS-422 A;485 Cables

Appendix 3 Using NS-AL002 Converters
● Crimp Terminals
Use M3 crimp terminals.
Forked type Round type
6.2 mm max. 6.2 mm max.
Applicable Crimp Terminal Examples
Forked type
Manufacturer Model Recommended cable size
J.S.T. Mfg. Co., Ltd. V1.25-N3A AWG22 to 16 (0.25 to 1.65 mm
2
)
Molex VSY1.25-3.5L AWG22 to 16 (0.3 to 1.65 mm
2
)
Round type
Manufacturer Model Recommended cable size
J.S.T. Mfg. Co., Ltd. V1.25-MS3 AWG22 to 16 (0.25 to 1.65 mm
2
)
Molex RAV1.25-3 AWG22 to 16 (0.3 to 1.65 mm
2
)
Recommended Cable
Manufacturer Model
Tachii Electric Wire Co., Ltd. TKV VBS3P-03
HIRAKAWA HEWTECH CORP. CO-HC-ESV-3P×7/0.2
A-3-6 Handling the Shield on RS-422A/485 Cables
Perform the following procedures to connect, process the shield, and connect to ground
for communications systems using the NS-AL002. Incorrect connection may result in
communications errors with the host.
● Connecting the NS-AL002 D-Sub Connector
Always securely tighten the screws on both sides of the D-Sub connector. Otherwise, the
functional ground terminal (FG: ) of the PT will not be properly connected to the func-
tional ground of the NS-AL002.
● Connecting the Ground Wire
The PT has a functional ground terminal (FG: ).
1. Ground according to Figure (a) for normal grounding.
•
•
•
•
Connect the ground terminal (GR) of the devices to the functional ground (FG: ).
Make sure that each signal line is grounded at only one point and ground to 100
Ω max.
Short the LG terminal of the PLC to the ground terminal (GR).
Use a wire gauge of at least 2 mm
2
for the ground wire.
Refer to the manual for individual Communications Units for details on proper wiring pro-
cedures.
2. Do not ground the functional ground (FG: ) of the PT if it is mounted to the same
panel as devices that generate noise, such as motors or inverters, as shown in Figure
(b).
A-21