Installation and Wiring
4-7
PL-5700 Series User’s Manual
2
Cautions: 100V PL-5700T*/S*/L* Units
When connecting power to the 100V PL Unit’s AC power terminals, please be aware of the following:
• If voltage fluctuations are expected to vary be-
yond the specified range, connect a constant
voltage transformer.
For information about the specified
voltage, refer to “
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 insulating
transformer used has a capacity of 200V
AC or more.
• Wire the power cords of the 100V PL, I/O
devices, and power supply devices sepa-
rately.
• To improve noise immunity, it is recom-
mended 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 to-
gether.
• To prevent damage from lightning, connect a
lightning surge absorber.
• Ground the lightning surge absorber (E1)
and the PL (E2) separately.
• Select a lightning surge absorber which will
not exceed the allowable circuit voltage, even
when the voltage rises to the maximum.
Constant
voltage
transformer
Twisted-pair
cable
PL
FG
Insulating
transformer
Twisted-pair
cable
PL
FG
Twisted-pair
cable
PL
FG
Lightning surge absorber
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
100V AC
PL power
source
I/O power
source
PL
I/O
device
AC
E1
Main power
source
200V AC