Mounting - Siemens 1PH728 Operating Instructions Manual

Installation / Assembly

3.4 Mounting

Balancing quality
The rotors are dynamically balanced. In the case of shaft ends with feather keys, the method
used to balance the rotors can be identified from the following coding to be found on the end
face at the drive end of the shaft end:
• Code "H" means balancing with half a feather key (standard version); this means that in
order to maintain the balancing quality it may be necessary to cut back the part of the
feather key protruding from the drive element and the shaft profile if the motor has a short
output element.
• "F" means balancing with a whole feather key (optional version).
Make sure that the balancing method of the output element is correct!
Caution
A suitable tool must always be used for fitting and pulling off output elements.
The feather keys are only locked against falling out during shipping.
Noise emission
Motors of the 1PH728 series have a measuring surface sound pressure level Lp(A) of
approx. 74 dB(A) in a speed range from 0 through 3000 rpm.
The motors are certified for a wide range of installation and operating conditions. In some
cases these conditions (e.g. rigid or vibration-isolated foundation design, use of sound-
absorbing elements) can have a very great influence on noise emissions.
When evaluating the noise levels at the workplaces of the system operators, consider the
fact that the A-weighted sound pressure level (measured in accordance with DIN EN 21680
Part 1) of 70 dB(A) is exceeded when the three-phase motors are operated at nominal load.
[ID: 326.01]
3.4 Mounting
Requirements
In order to ensure smooth, vibration-free motor operation, a stable foundation design is
required, the motor must be precisely aligned, and the components that are to be mounted
on the shaft end must be correctly balanced.
Fixing by means of motor feet
If the motor needs to be aligned, position metal shims underneath the feet in order to prevent
the motor from suffering distortion.
The number of shims should be kept as low as possible i.e. stack as few as possible.
3-4
Siemens AG A5E00177602A
Operating Instructions V 2.0 1PH728