Mitsubishi Electric Melsec-Q172DCPU User Manual page 179

4 INSTALLATION AND WIRING
POINT
(1) Use the thickest possible (up to 2mm
power cables. Be sure to twist these wires starting at the connection terminals.
For wiring a terminal block, be sure to use a solderless terminal. To prevent a
short circuit should any screws loosen, use solderless terminals with insulation
sleeves of 0.8mm (0.03inch) or less.
Also, only two solderless terminals can be connected per terminal block.
Solderless terminals
with insulation sleeves
(2) Ensure that the earth terminals LG and FG are grounded.
(Ground resistance : 100 or less)
If not, the programmable controller may become susceptible to noise.
Since the LG terminal has a half of the input voltage, touching this terminal
may result in an electric shock.
(3) No system error can be detected by the ERR. terminal of an extension base
unit. (The ERR. terminal is always set off.)
2
) wires for the 100/200VAC and 24VDC
Terminal
block
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