Allen-Bradley 2755 Manual do Utilizador descarregar pdf (Página 55)

Installing the Wiring Base and Power Supply 3–20

Output Module Application

Shown below is a typical output module application. When

connecting high impedance loads, you may need to add a resistor in

parallel with the load. This resistor (typically 300 to 6,000 ohms)

provides a continuous minimum current flow (10 mA DC or 50 mA

AC) through the output module in the closed state. See Appendix C

for available Allen-Bradley fuse, diode and resistor terminal blocks.

–+

AC or DC Source

Optional Resistor

Fuse

Recommended

Load

Back Electromotive Force (EMF) is sometimes generated when an

inductive load is switched off. Back EMF may damage the output

module. A diode in parallel with the inductive device dissipates the

back EMF.

–+

DC Source

Optional Diode

Fuse

Recommended

Inductive

Load

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Allen-Bradley 2755 Manual do Utilizador Página 55