Rockwell-automation 1747-ACNR15 ControlNet Adapter Module User Manual Uživatelský manuál stáhnout pdf (Strana 113)

Publication 1747-UM003A-EN-P

Understanding Your SLC 500/1746 Control System B-21

These surge suppression circuits connect directly across the load device. This

reduces arcing of the output contacts. (High transient can cause arcing that

occurs when switching off an inductive device.) Suitable surge suppression

methods for inductive ac load devices include a varistor, an RC network, or an

Allen-Bradley surge suppressor. These components must be appropriately rated

to suppress the switching transient characteristic of the particular inductive

device.

For inductive dc load devices, a diode is suitable. A 1N4004 diode is acceptable

for most applications. We recommend that you locate the suppression device as

close as possible to the load device.

Mounting Your Control

System

This section assists you in mounting your modular style unit. It consists of the

dimensions of the four modular hardware styles and link coupler. For more

information, see the SLC 500 Modular Chassis Installation Instructions,

publication number 1746-5.8.

Mounting Modular Hardware Style Units

You can mount the modular hardware style units directly to the back panel of

your enclosure using the mounting tabs and M4 or M5 (#10 or #12) screws.

The torque requirement is 3.4 Nm (30 in-lbs) maximum.

Left-side View (all chassis)

0.1 cm

(0.04 in.)

14.0 cm

(5.51 in.)

14.5 cm

(5.71 in)

17.1 cm

(8.73 in.)

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Rockwell-automation 1747-ACNR15 ControlNet Adapter Module User Manual Uživatelský manuál Strana 113