YASKAWA SI-C3/V Technical Manual page 12

 Setting Grounding Method Switch
The grounding method switch (S1) can change the grounding method for the CC-Link Option between common grounding and independent
grounding.
Figure 7
Note: 1. The grounding method switch (S1) is only available for CC-Link Options REV.B and later. Check the REV version printed on the nameplate of your CC-Link Option.
2. When you set the grounding method switch (S1) to the "NC" side, the FE terminal of the CC-Link Option can be set to NC (No Connection).
Follow the procedure below to switch the grounding method.
 Common Grounding
Switch the grounding method switch (S1) to the "FE" side to use the CC-Link Option for common grounding.
 Independent Grounding
Follow the procedure below to use the CC-Link Option for independent grounding.
1. Switch the grounding method switch (S1) to the "NC" side.
2. Wire a ground cable to the SLD terminal on the terminal block (CN1).
Note: Make sure that you ground the SLD terminal when you set the grounding method switch (S1) to "NC". Ungrounded options can cause external noise and unstable
communications.
YASKAWA ELECTRIC SIEP C730600 22C V1000 Option CC-Link Technical Manual
S1
NC FE
Figure 7 Grounding Method Switch (S1)
5 Installation Procedure
13