Rockwell Automation 1747-ACNR15 ControlNet Adapter Module User Manual - Manual (Page 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.)