Motors-D81.1-complete-English-06-2020

© Siemens 2020
Introduction
Mechanical version
Balance and vibration severity
1 ■ Overview
All rotors are dynamically balanced with an inserted half key.
This corresponds to vibration severity grade A (normal or standard).
DIN EN 60034-14 Aug. 2018 regulates the vibrational behavior
of machinery. Based on ISO 21940-32, the key convention
"half key (H)" must be used for balancing.
Note:
If there is a keyway, a full feather key is always inserted on
delivery.
The type of key convention is stamped on the face of the shaft
extension at the customer side DE/NDE:
F = Balancing with full key
(full-key convention)
H = Balancing with half key
(half-key convention) – standard
N = Balancing without key –
Plain text required (convention without key)
For motors up to frame size 112 the code is stamped on the rating
plate.
Full-key balancing or balancing with full feather key (F) is possible
by specifying order code L02 (additional charge).
Balancing without feather key (N) is possible by specifying order
code L01 (additional charge).
Vibration severity grade A is the standard version and is valid up
to a rated frequency of 60 Hz. If 2-pole motors of frame sizes 280
and 315 are to be rigidly installed, cast feet are necessary in order
to comply with the vibration requirements of IEC 60034-14.
IE4 2-pole motors in frame size 315 and pole-changing motors
(4-pole/2-pole) fulfill the vibration requirements specified in
IEC 60034-14 only when the motor is elastically suspended.
The low-vibration version B can be supplied to fulfill stricter requirements
on smooth running
(additional charge).
Vibration severity grade B
Not possible with cylindrical roller bearings.
Order code L00
The order code L00 vibration severity grade B is not possible in
combination with order codes G40, G41, G42. 2-pole trans-standard
aluminum motors in frame sizes 180 and 200
(14th position of the Article No. is A, C, D, J, T, U, V) and order
code L00 have cast-iron feet.
This vibration is assessed in accordance with vibration severity
grade A or B according to EN 60034-14 (see table).
The limits stated in the table apply to uncoupled, freely suspended,
idling motors.
For converter operation with frequencies higher than 60 Hz, special
balancing is required for compliance with the specified limit
values (plain text: maximum supply frequency/speed).
For further details, see the online help in the DT Configurator.
Limits (rms values) for max. vibration severity in terms of vibration displacement
(s) and vibration velocity (v) for the shaft height H
Vibration severity
grade
Machine installation
Shaft height H
in mm
56 H 132 H>132
s rms v rms s rms v rms
µm mm/s µm mm/s
A Free suspension 45 2.8 45 2.8
Rigid clamping – – 37 2.3
B Free suspension 18 1.1 29 1.8
Rigid clamping – – 24 1.5
For details, see standard EN 60034-14 Aug. 2018,
EN 60034-14:2004 + A1:2007
If the type tests for machines with shaft height H > 132 mm
demonstrate a determining component with twice the line frequency,
the limit for maximum vibration severity in the Table (for
grade A) can be increased from 2.3 mm/s (rms value) to
2.8 mm/s (rms value) or (for grade B) from 1.5 mm/s (rms value)
to 1.8 mm/s (rms value). Higher values must be agreed beforehand.
A component with twice the line frequency is regarded as
dominant if the type test shows that it is greater than 70 % of
2.3 mm/s (rms value) (for grade A) or 70 % of 1.5 mm/s (rms
value) (for grade B).
1/50 Siemens D 81.1 · 06/2020