Trane Centrifugal CVHE/CVHF Chiller:
All measurement locations except the Axial data can be collected with a magnetic mounting.
Axial readings require utilization of a stud mounting. Utilize the manufacturers supplied
stud at approximate 5:30 location on the bearing cover. Use appropriate stud adapter supplied by CSI. Additional readings can be taken along with vibration data. Motor current readings are normally collected
on all 480 volt machines on one line. Sound readings can also be utilized if noise is
an issue. Always note the chiller model number, Serial number, Load %, # of starts,
# of run hours each time data is collected. Normally total time to collect data is about
15 minutes using a digitally recording vibration analyzerChiller faults? Unbalance= Greater than .25 in/sec velocity pk in radial direction. (usually motor outboard) Motor outboard bearing faults. Audible noise, high energy (0-3,000 Hz) area at bearing fault frequencies.
High acceleration levels in motor outboard axial indicating initial bearing wear. Rubbing of motor inboard bearing. Can come and go w/high 1xrpm levels as indicator. Flow vibration between 65-115 Hz area. Broken Rotor bars in the motor
currrent data. Surging (audible squeeling). Lost
preload usually indicated by high radial and axial 1xrpm levels. High 120 Hz motor hum
which can indicate a poorly wound stator.