Rockwell Automation 1606-XLP XM Electronic Overspeed Detection System - Manual (Page 19)

Publication GMSI10-UM015B-EN-E - June 2011
Installing the XM Electronic Overspeed Detection System 19
24V Common Grounding
It is recommended that all 24V power to the XM modules is grounded. When
two or more power supplies power the XM system, ground the 24V Commons
at a single point, such as the ground bus bar.
For applications where redundant power supplies are used, only one power
supply needs to be grounded. The XM module ties the two 24V Common
lines together.
Transducer Grounding
Make certain the transducers are electrically isolated from earth ground. Cable
shields must be grounded at one end of the cable, and the other end left
floating or not connected. It is recommended that where possible, the cable
shield be grounded at the XM terminal base by connecting to a Chassis
terminal and not at the transducer.
Switch Input Grounding
The Switch Input circuits are electrically isolated from other circuits. It is
recommended that the Switch RTN signal be grounded at a single point.
Connect the Switch RTN signal to the XM terminal base (Chassis terminal) or
directly to the DIN rail, or ground the signal at the switch or other equipment
that is wired to the switch.
Mounting the Power Supply
Modules The XM EODS requires two Allen Bradley power supply modules (Cat. No.
1606-XLP30E). The power supply modules are DIN rail mountable and
provide redundant power to the XM EODS. These modules provide all the
system power and each can be powered by +24V dc and/or 85 to 264V ac.
The outputs of the two power supply modules are connected to the terminal
base units of the XM modules. See Figure 2.7 on page 29. A failure in one of
the power supplies will not affect the operation of the EODS.
Refer to the documentation that was shipped with the 1606-XLP power supply
for instructions on how to install the power supply modules.
IMPORTANT
The 24V Common and Signal Common terminals are
internally connected. They are isolated from the Chassis
terminals unless they are connected to ground as described
in this section. See Terminal Block Assignments on page 24
for more information.