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PL-6700 Series User’s Manual
Optional Units and Expansion Boards
2
Power Supply Cautions
When connecting power to the 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) .
• Wire the power cords of the PL, I/O de-
vices, and power supply devices separately.
• 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.
• To prevent damage from lightning, connect a
lightning surge absorber.
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
Twisted-pair
cable
PL
FG
Lightning surge absorber
AC
E1
E2
• 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 volt-
age rises to the maximum.
Be sure any constant or insulating
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
Summary of Contents for PL-6700 Series
Page 1: ...PL 6700 Series Panel Computer User s Manual Digital Electronics Corporation...
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Page 73: ...Maintenance and Inspection 7 4 PL 6700 Series User s Manual MEMO...