Mitsubishi Electric Q26UD(E)HCPU User Manual page 107

(2) Wiring examples
The following figures show wiring examples of cables such as power cables and ground wires to the main base
unit and extension base units.
(a) Single power supply system
AC
Connect to 24VDC
terminals of I/O module
that requires 24VDC
internally.
Extension cable
*1 The operation of the ERR terminal is as follows:
<When the power supply module is mounted on the main base unit>
The terminal turns off (opens) when the AC power is not input, a CPU module stop error (including a reset) occurs, or the
fuse of the power supply module is blown.
<When the power supply module is mounted on the extension base unit>
The terminal is always off (opened).
*2 Ground the LG and FG terminals by using a ground wire as thick and short as possible (2mm in diameter).
● Use the thickest possible (max. 2mm
the connection terminals. Use a solderless terminal for wiring a terminal block. To prevent short-circuit due to loosening
screws, use the solderless terminals with insulation sleeves of 0.8mm or less.
Note that up to two solderless terminals can be connected per terminal block.
● When LG and FG terminals are connected, ground the wires.
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 electric shock.
● No system error can be detected by the ERR terminal of an extension base unit. (The ERR terminal is always set to off.)
Main base unit
100/110VAC
Q61P
Fuse
AC
DC
24VDC
Extension base unit
100VAC
Ground wire
Grounding
2
) wires for the 100/200VAC and 24VDC power cables. Twist these wires starting at
Solderless terminals
with insulation sleeves
CHAPTER 4 INSTALLATION AND WIRING
(Q38B)
CPU module
*1
ERR
*2
FG
*2
LG
INPUT
100-240VAC
(Q68B)
Q61P I/O module
*1
ERR
*2
FG
*2
LG
INPUT
100-240VAC
Terminal block
4
105