Digital Electronics Corporation PS-2000B Series Manuale di installazione - Pagina 15
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Power Supply Cautions
When connecting the PS-B unit's AC power terminals, please be aware of the
following:
Twisted-pair
cord
Constant
voltage
transformer
Twisted-pair
cord
Insulating
transformer
AC100V
PS-B
Main power
power
source
source
I/O power
source
Main power
source
PS-B
AC 200V
power
T1
source
T2
I/O power
source
Main circuit
power source
AC
Twisted-pair
cable
E1
Lightning surge absorber
• If voltage fluctuations are expected to vary
beyond the specified range, connect a constant
PS-B
FG
voltage transformer.
• Use a low-noise power supply both between
the lines and between the PS-B and its ground.
PS-B
FG
If there is still excess noise, connect an insulat-
ing transformer (noise-prevention type) .
• Wire the power cords of the PS-B, I/O devices,
PS-B
and power supply devices separately.
• To improve noise immunity, Pro-face is
I/O device
recommends attaching a ferrite core to the
power cord.
• Isolate the main circuit (high voltage, large
PS-B
current) line, I/O signal lines, and power cord,
and do not bind or group them together.
I/O
device
I/O
device
Power
• To prevent damage from lightning, connect a
device
lightning surge absorber.
PS-B
FG
E2
15
Be sure any constant or insulating
transformer used has a capacity of
200VA or more.
• Ground the lightning surge ab-
sorber (E1) and the PS-B (E2)
separately.
• Select a lightning surge absorber
which will not exceed the allow-
able circuit voltage, even when
the voltage rises to the maximum.