Yokogawa YFGW410 - Manual (Page 44)

<C4. Wiring>
C4-6
IM 01W02D01-01EN
C4.3 Grounding
Appropriate grounding is necessary for the stable operation of YFGW410. The YFGW410 has
two ground terminals: the frame ground (FG) terminal secured by the M4 screw at the side of
power supply connector (on the top side of the mainbody), and the ground terminal at the power
supply spring terminal.
Connect the ground cable from the frame ground (FG) terminal to the ground. Connect the cable
shield or others to the power supply spring terminal.The internal wiring of YFGW410 mainbody is
connected as shown in the following fi gure.
YFGW410 Housing
-
+
NC
SG
RX -
RX +
TX -
TX +
Power supply
connector
RS-485
connector
Ground
terminal
FC0406.ai
Figure C4-4 Internal connection of the ground terminal
To ensure stable grounding, insulate the panel or DIN rails with YFGW410 from the metal surface
of external cabinet, rack and others by using insulation bushings or others. Then, connect the ca-
ble from YFGW410 to the ground. Class D grounding (the third class grounding) with the ground
resistance of 100 ohms or less is necessary. To connect the ground cable to YFGW410 directly,
use the frame ground (FG) terminal on the top side of the mainbody. YFGW410 should not share
a ground wire with other devices.