A5E01083943A AB
Siemens AG Operating Instructions 2.02 1FW4
101
Glossary
Aligning
The motor and the driven machine must be positioned in such a way that the center lines of
the shaft run along a common axis. Parallel offsets and angular offsets must be
compensated.
Attachment points
Positions on the machine specifically designed for lifting the machine. Suspending a load on
a crane is called "attaching".
Auxiliary circuit
Circuits that do not directly provide power to the machine are called auxiliary circuits. These
can be circuits for signaling equipment or the anti-condensation heating, for example.
A-weighted sound pressure level
The human ear experiences the same sound pressure level at different volumes for different
frequencies. In the practice of sound measurement, sound pressure is specified in decibels
(dB). To give consideration to the human ear's dependence on frequency, a "frequency
weighting" was introduced which simulates the limited sensitivity of the human ear for low
frequencies (< 1000 Hz) and high frequencies (> 5000 Hz). This same frequency weighting
is used throughout the world and is referred to as the A-weighting: DIN 45 633. All
conventional sound measuring devices measure the sound pressure level dB and the
A-weighted sound pressure level dB(A). Limit values as per: EN 60 034 Part 9.
Bearing cover
The bearing cover secures and protects the bearings in the bearing housings and on their
respective shafts.
Bearing shield
The bearing shields are the face-end housing limitations of the motors. The bearing housings
and the bearings are located in the bearing shields.
Cable lug
Cable lugs are used in order to allow simple electrical contacting of cables or lines. Cable
lugs are shaped like a sleeve on one end (for attaching them to the conductor) and they
generally have a drill hole on the other end (for screwing them tight with a connecting bolt).
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