Chapter 4 - Specifications
PL-6700 43 Series User’s Manual
4-8
• If voltage fluctuations are expected to vary be-
yond the specified range, connect a constant
voltage transformer.
For information about the specified
voltage,
“ “2-1 General
Specifications”
• Use a low-noise power supply both be-
tween the lines and between the PL and its
ground. If there is still excess noise, con-
nect an insulating transformer (noise-pre-
vention type) .
• Be sure any constant or insulat-
ing transformer used has a
capacity of 200VA or more.
100/200V AC
PL power
source
I/O power
source
PL
I/O
device
Main power
source
2. Power Supply Cautions
When connecting power to the PL unit’s AC power terminals, please be
aware of the following:
Reference
Note:
4-3 Wiring the PL
Fig. 1
Constant
voltage
transformer
Twisted-pair
cable
PL
FG
Insulating
transformer
Twisted-pair
cable
PL
FG
Main power
source
PL power
source T1
T2
I/O power
source
PL
I/O
device
I/O
device
Main circuit
power source
Power
device
200V AC
• To improve noise immunity, it is recommended
to attach a ferrite core to the power cord.
• Isolate the main circuit (high voltage, large
current) line, I/O signal lines, and power cord,
and do not bind or group them together.
• Wire the power cords of the PL, I/O devices,
and power supply devices separately.
Fig. 2
Fig. 3
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