1.7 Grounding of the Controller
Unified Controller nv series type2 light Controller Unit Instruction Manual
21
(2) Ground wiring between bases
FG
I/ Oユニット
電源
FG
FG
I/ Oユニット
FG
I/ Oユニット
コント ローラユニット
ベースユニット
盤内接地ブス
制御装置専用D種接地
Figure 1-11
Ground wiring between bases
・
Connect the FG terminal and the base fixing screw of the power module to wire
the board in the shortest distance to the on-board ground bus with 2mm
2
or
more wire.
・
Separate the ground from the grounding cable of a strong electric circuit only for
the control device, namely D type grounding.
(3) Line filter ground (LG) terminal
The LG terminal is a neutral of the primary power line filter. Grounding the LG
terminal has an effect to reduce the impact by common mode noises.
Therefore, connect the LG terminal to the on-board ground bus with 1mm
2
or more
wire. However, if the power is a single grounding system, leakage current may
pass from LG to the earth and causes a problem. In that case, put an insulating
transformer in the power or open the LG terminal. If you have isolated the
controller unit, open the LG terminal.
Avoid connecting LG and FG without grounding LG and FG.
(4) Frame ground (FG) terminal
This is the grounding terminal of the controller unit. The metal part of the base unit
has the same electric potential as that of the FG terminal. Be sure to ground them
at a single point for anti-static measures, security and safety reasons.
Controller unit
Base unit
supply
I/O unit I/O unit I/O unit
On-board ground bus
Dedicated D class ground for the control device
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