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MELSEC-Q
9 LOADING AND INSTALLATION
9.6.2 Connecting to the power supply module
The following diagram shows the wiring example of power lines, grounding lines, etc.
to the main and extension base units.
AC
100/110VAC
Fuse
24VDC
AC
DC
Connect to 24VDC terminals
of I/O module that
requires 24VDC internally.
Extension cable
Ground wire
Grounding
Main base unit
(Q38B)
Q61P-A1 CPU module
Extension base unit
(Q68B)
Q61P-A1 I/O
100VAC
ERR
FG
LG
INPUT
100-120VAC
FG
LG
INPUT
100-120VAC
ERR 1
POINTS
(1) Use the thickest possible (max. 2 mm
2
(14 AWG)) wires for the 100/200 VAC
and 24 VDC power cables. Be sure to twist these wires starting at the
connection terminals. To prevent a short-circuit should any screws loosen, use
solderless terminals with insulation sleeves.
(2) When the LG terminals and FG terminals are connected, be sure to ground the
wires. Do not connect the LG terminals and FG terminals to anything other than
ground. If LG terminals and FG terminals are connected without grounding the
wires, the PLC may be susceptible to noise.
In addition, since the LG terminals have potential, the operator may receive an
electric shock when touching metal parts.
(3)
1 An error cannot be output from the ERR terminal of the power supply
module loaded on the extension base.
To output an error, use the ERR terminal of the power supply module
loaded on the main base unit.