Rockwell Automation 1606-XLP XM Electronic Overspeed Detection System - Manual (Page 20)

Publication GMSI10-UM015B-EN-E - June 2011
20 Installing the XM Electronic Overspeed Detection System
Mounting the Terminal
Base Units The XM family includes several different terminal base units to serve all of the
measurement modules.
• The XM-941 terminal base, Cat. No. 1440-TB-B, is the only terminal
base unit used with the XM-220 module.
• The XM-946 terminal base, Cat. No. 1440-TB-G, is the only terminal
base unit used with the XM-442 module.
The terminal base can be DIN rail or wall/panel mounted. Refer to the
specific method of mounting below.
DIN Rail Mounting
Use the steps below to mount the XM-941 and XM-946 terminal base units on
a DIN rail. We recommend you mount the XM-946 terminal base first, next to
the power supply modules (see Figure 2.7 on page 29).
ATTENTION
The XM modules make a chassis ground connection
through the DIN rail. Use zinc plated, yellow chromated
steel DIN rail to assure proper grounding. Using other
DIN rail materials (e.g. aluminum, plastic, etc.), which can
corrode, oxidize or are poor conductors can result in
improper or intermittent platform grounding.
You can also mount the terminal base to a grounded
mounting plate. Refer to Panel/Wall Mount Grounding on
page 17.