Rockwell Automation 1440-TPS02-01RB XM-320 Position Module - Manual (Page 9)

1 Publication GMSI10-UM005C-EN-P - May 2010
Chapter
1
Introduction
This chapter provides an overview of the XM-320 Position module. It also
discusses the components of the module.
Introducing the XM-320
Position Module The XM-320 Position module is a 2-channel general purpose monitor. It is a
member of the Allen-Bradley™ XM
®
Series, a family of DIN rail mounted
condition monitoring and protection modules that operate both in stand-alone
applications or integrate with Programmable Logic Controllers (PLCs) and
control system networks.
The XM-320 supports the following measurements:
• Axial Position (Thrust) - Axial position (thrust) is a measurement of
the relative position of the thrust collar to the thrust bearing. It is a
measurement that may be made in both the active and inactive thrust
directions. The primary purpose of this measurement is to monitor
thrust bearing wear and to insure against axial rubs. It is recommended
that at least two separate transducers monitor axial position so that the
redundancy will give added protection.
Most steam turbine rotors operate within the total clearance between
thrust shoes (float). Normally this clearance is anywhere from 0.010 to
0.024 inches. The axial measurements are obtained by mounting a
non-contact probe axially, looking at the thrust collar or shaft. The
sensor provides a continuous measurement of the rotor position with
respect to the thrust bearing. In most applications, the thrust detector is
located in close proximity to the thrust bearing, normally located in the
turbine front standard.
For information about See page
Introducing the XM-320 Position Module 1
XM-320 Module Components 3
Using this Manual 4