Proface LT3300 - 5.7 All-in-One HMI" Uživatelský manuál stáhnout pdf (Strana 77)

LT3000 Series Hardware Manual

4-10

4.2.2 Connecting the Power Supply

This section describes the precautions for supplying a power voltage.

• If the supplied voltage exceeds the LT unit’s range,

connect a constant voltage transformer.

• For between the line and ground, select a power supply

that is low in noise. If there is an excess amount of noise,

connect a insulating transformer.

• When supplying power to the LT unit, be sure to

separate the input/output and power lines, as shown.

• To increase the noise resistance quality of the power

cord, simply twist each power wire before attaching the

Ring Terminal.

• The power supply cable must not be bundled or

positioned close to main circuit lines (high voltage, high

current), or input/output signal lines.

• Connect a lightening surge absorber, as shown in the

diagram, to deal with power surges.

• To avoid excess noise, make the power cord as short as

possible.

• 24V DC input unit is must be used with a Class 2 power

supply.

SEE

Chapter 2 Specifications (page 2-1)

• Use constant voltage and

insulating transformers with

capacities exceeding Power

Consumption value.

• Be sure to ground the surge

absorber (E1) separately from the

LT unit (E2).

• Select a surge absorber that has

a maximum circuit voltage greater

than that of the peak voltage of

the power supply.

LT Power

Input/Output

Power

Main Power

Main Circuit

Lightening Surge

Absorber

Constant

Voltage

Transformer

Twisted-pair cord

nsulating

Transformer

Twisted-pair cord

Input/Output

Unit

Main

Power

Input/

Output

Power

Input/Output

Unit

Input/Output

Unit

Operation

Unit

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Proface LT3300 - 5.7 All-in-One HMI" Uživatelský manuál Strana 77

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