Digital Electronics Corporation PLB911-42 Kurulum Kılavuzu - Sayfa 15

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Power Supply Cautions

When connecting the PL unit's AC power terminals, please be aware of the

following:

Twisted-pair

cable

Constant

voltage

transformer

Twisted-pair

cable

Insulating

transformer

AC100V

PL power

Main power

source

I/O power

source

Main power

source

PL power

AC 200V

source T1

I/O power

source

Main circuit

power source

Twisted-pair

cable

Lightning surge absorber

• If voltage fluctuations are expected to vary

beyond the specified range, connect a constant

voltage transformer.

• Use a low-noise power supply both between

the lines and between the PL and its ground.

If there is still excess noise, connect an insulat-

ing transformer (noise-prevention type) .

• Wire the power cords of the PL, I/O devices,

and power supply devices separately.

• To improve noise immunity, it is recom-

I/O device

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 together.

I/O

device

I/O

device

• To prevent damage from lightning, connect a

Power

device

lightning surge absorber.

Be sure any constant or insulating

transformer used has a capacity of

200VA or more.

• Ground the lightning surge ab-

sorber (E1) and the PL (E2) sepa-

rately.

• Select a lightning surge absorber

which will not exceed the allow-

able circuit voltage, even when

the voltage rises to the maximum.