|
Any electric motors that uses rolling element bearings are
candidates for vibration monitoring
for early fault detection. Following is a short list of conditions easily
monitored by their vibration signals on electric motors.
-
Defective rolling element bearings
-
Misalignment of drive couplings or installed bearings
-
Bent shaft
-
Unbalance of rotating parts
-
Machine looseness and foundation problems
-
Electrical associated problems
Installing the CMCP500 Series
Transmitters or
Monitors locally
can provide displays and convenient access to the buffered output of the
accelerometers for data collection while providing an 4-20 mA output for use
with existing PLC or DCS systems. When the CMCP500 Series Monitors are used,
they provide alarming and relays that can trip a shutdown if the machine
becomes unsafe to prevent harm from the machine and to personnel.
Vibration
Monitoring
Referring to figure at the top of this page, ideally
accelerometers should be mounted at
both bearings (1 and 2)on the electric motor.
The accelerometers should be mounted in a horizontal direction and if the
bearing housing is split, the accelerometer should be mounted below the
split.
The accelerometers are wired to a
CMCP530 or
CMCP530A Vibration Transmitter or
Monitor. As an additional option, they can also be jumpered to Acceleration
Enveloping transmitters and monitors that detect higher frequencies thus
providing even earlier warning of bearing failure.
A typical vibration monitoring system for fan
/ blower machine would consist of:
-
2 accelerometers -
CMCP1100
- 2
Vibration Velocity Transmitters or
Monitors - CMCP530 or
CMCP530A
- Options would include:
For additional reading on vibration monitoring visit:
STI's Application Notes |
