Rockwell Automation 1441-DYN25-MBMP Bump Test Extension Module for the Dynamix 2500 - Manual (Page 15)

Rockwell Automation Publication 1441-UM002A-EN-P - May 2011 15
Chapter
2
Bump Test Extension Module
The Bump Test extension module is an optional module for the Dynamix 2500
data collector. You install the extension module with the Bump Test SD storage
card.
See Installing Optional Extension Modules on page 7 for installation
instructions.
The Bump Test extension module for the Dynamix 2500 data collector provides
an effective way of determining natural (or resonant) frequencies of a machine or
structure.
A bump test (or hammer test) determines the natural frequencies of a machine or
a structure. The idea behind the test is that when an object is impacted or
bumped, the object’s natural or resonant frequencies are excited. If a
measurement is taken while the object is vibrating due to the impact, peaks will
result and pinpoint the object’s natural frequencies. The Dynamix 2500 data
collector can be used to capture this frequency response and illustrates the
resonant frequencies.
Vibration forces transmitted by rotating machines often excite natural resonance
in structures attached to the machine. When these structural resonances appear,
vibration levels are amplified and can result in fatigue failures. Structural
resonances can also mask the cause of a machine’s vibration making it difficult to
implement corrective machine maintenance. The Bump Test identifies a
structure’s resonant modes and provides you with the opportunity to change the
resonance frequency to reduce or eliminate damaging vibration levels.
Topic Page
Set Up Bump Test Measurements 16
Collect Bump Test Measurements 19
Save a Bump Test Setup and Measurement 21
Recall a Setup 21
Review Bump Test Measurements 23
Save Files to Your Computer 25
Back Up Your files 26
Delete Bump Test Files 28