14
On large electric motors, the bearings are often mounted in
housings which are welded or bolted to the motor shields.
Because of the damping in the interface between the bushing
and the shield, the measuring point should be on the bushing.
The bearing housing at the drive end (A) is usually within reach.
A long adapter is installed at an angle to the shield, so that
there is enough space for connecting the transducer.
Installed transducer
The bearing at the fan end (B) requires a permanent trans-
ducer installation. The transducer is installed in the bushing.
The coaxial cable is run through a slit in the fan cover to a
measuring terminal on the stator frame.
Check installed equipment
Incorrectly installed adapters or transducers can cause a sig-
nificant damping of the shock pulse signal.
Check all installations. Make sure that mounting holes are
correctly countersunk and that the seat surfaces of adapters
have good contact with the material of the bearing housings.
Any metallic machine part knocking or rubbing against the
adapter will produce a disturbance. This must be avoided by
making large clearance holes and using soft, elastic sealing
material.
Use high-temperature cables and moisture-proof equipment
where required, and protect installations against damage.
Adapters should be fitted with protective caps.
Mark the measuring points
Measuring points for the probe transducer should be clearly
marked. To get comparable readings, one must always use
the same measuring point.
A
drive end
A
B
B
fan end
To Next Page
Loading...
Need help?
General