Grounding - Mitsubishi FX3U-4AD User Manual

FX /FX /FX PLC User's Manual - Analog Control Edition
3G 3U 3UC
FX -4AD/FX -4AD (4-channel Analog Input)
3U 3UC
3.4.2 FX -4AD
3UC
If current input is
selected
If voltage input is
selected
V +, I +, ch
*1. Use the 2-core shielded twisted pair cable for the analog input lines, and separate the analog input
lines from the other motive power lines or inductive lines.
*2. To use the current input, be sure to short circuit the line between the V
+ terminal (
*3. The SLD and "
*4. Do not connect any lines to the "•" terminal.
3.5

Grounding

Grounding should be performed as stated below.
• The grounding resistance should be 100Ω or less.
• Independent grounding should be performed for best results.
When independent grounding is not performed, perform "shared grounding" as shown in the following
figure.
PLC
equipment
Independent grounding
Best condition
• Use the following grounding wire.
FX -4AD
3U
FX -4AD
3UC
• The PLC grounding point should be close, and all grounding wires should be as short as possible.
B-18
Terminal
block
*1
V +
*2
I +
COM
SLD
*1
V +
I +
COM
SLD
•
*4
Class-D
grounding
: represents the channel number.
: channel number).
" terminals are connected to each other inside.
→ For details, refer to the User's Manual - Hardware Edition of each Series.
Other Other
PLC
equipment
Shared grounding
Good condition
2
AWG14 (2mm )
2
AWG22-20 (0.3 to 0.5mm
FX -4AD
3UC
6.8kΩ
250Ω
200kΩ
*3
6.8kΩ
250Ω
200kΩ
Other
PLC
equipment
Common grounding
Not allowed
)
ch
ch
+ terminal and the I
3 Wiring
3.5 Grounding