SIST IEC 60034-14 Ed. 4.0:2018

Rotating electrical machines - Part 14: Mechanical vibration of certain machines with shaft heights 56 mm and higher - Measurement, evaluation and limits of vibration severity

IEC 60034-14:2018 is now available as IEC 60034-14:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60034-14:2018 specifies the factory acceptance vibration test procedures and vibration limits for certain electrical machines under specified conditions, when uncoupled from any load or prime mover. It is applicable to DC and three-phase AC machines, with shaft heights 56 mm and higher and a rated output up to 50 MW, at operational speeds from 120 min–1 up to and including 15 000 min–1. This new edition includes the following significant technical changes with respect to the previous edition:
- Improved explanation of the definition “free suspension”.
- Addition of an alternative method of rigid mount
- Definition of an improved option for shaft key.

Machines électriques tournantes - Partie 14: Vibrations mécaniques de certaines machines de hauteur d'axe supérieure ou égale à 56 mm - Mesurage, évaluation et limites de l'intensité vibratoire

IEC 60034-14:2018 est disponible sous forme de IEC 60034-14:2018 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L’IEC 60034-14:2018 spécifie les procédures d'essai d’acceptation de vibration en usine et les limites de vibration pour certaines machines électriques, dans des conditions spécifiées, sans être couplées à une charge ou à une machine entraînée. Elle est applicable aux machines à courant continu et aux machines triphasées à courant alternatif de hauteur d'axe supérieure ou égale à 56 mm et de puissance assignée inférieure ou égale à 50 MW, à des vitesses de fonctionnement de 120 min–1 jusqu'à et y compris 15 000 min–1. Cette nouvelle édition inclue les modifications techniques majeures suivantes par rapport à l’édition précédente:
- Meilleure explication de la définition «suspension libre».
- Ajout d’une méthode alternative de montage rigide.
- Définition d’option améliorée pour les clavettes d’arbre.

[Not translated]

General Information

• Status: Not Published
• Technical Committee: ERS - Rotating machinery
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 30-Jan-2018
• Due Date: 19-Jun-2018
• Completion Date: 16-Feb-2018
• Ref Project: IEC 60034-14:2018 - Rotating electrical machines - Part 14: Mechanical vibration of certain machines with shaft heights 56 mm and higher - Measurement, evaluation and limits of vibration severity

Standards Content (Sample)

IEC 60034-14
®

Edition 4.0 2018-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Rotating electrical machines –
Part 14: Mechanical vibration of certain machines with shaft heights 56 mm
and higher – Measurement, evaluation and limits of vibration severity

Machines électriques tournantes –
Partie 14: Vibrations mécaniques de certaines machines de hauteur d’axe
supérieure ou égale à 56 mm – Mesurage, évaluation et limites de l’intensité
vibratoire

IEC 60034-14:2018-08(en-fr)

---------------------- Page: 1 ----------------------
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IEC 60034-14

®


Edition 4.0 2018-08




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE












Rotating electrical machines –

Part 14: Mechanical vibration of certain machines with shaft heights 56 mm

and higher – Measurement, evaluation and limits of vibration severity




Machines électriques tournantes –

Partie 14: Vibrations mécaniques de certaines machines de hauteur d’axe


supérieure ou égale à 56 mm – Mesurage, évaluation et limites de l’intensité

vibratoire












INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

INTERNATIONALE




ICS 29.160.01 ISBN 978-2-8322-5902-3




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 3 ----------------------
– 2 – IEC 60034-14:2018 © IEC 2018
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references. 6
3 Terms and definitions . 6
4 Measurement quantities . 7
4.1 General . 7
4.2 Vibration magnitude . 7
4.3 Relative shaft vibration . 7
5 Measurement equipment . 7
6 Machine mounting . 8
6.1 General . 8
6.2 Free suspension . 8
6.3 Rigid mounting . 8
6.3.1 Foundation . 8
6.3.2 Horizontal machines . 9
6.3.3 Vertical machines . 9
6.4 Active environment determination . 9
7 Conditions of measurement. 10
7.1 Key . 10
7.2 Measurement positions and directions . 10
7.2.1 Measurement positions for vibration . 10
7.2.2 Measurement positions for relative shaft displacement . 10
7.3 Test conditions . 10
7.4 Vibration transducer . 10
8 Limits of bearing housing vibration . 11
8.1 Limits of vibration magnitude . 11
8.2 Limits of vibration velocity with twice-line frequency for a.c. machines . 12
8.3 Axial vibration . 12
9 Limits of relative shaft vibration . 12
Bibliography . 18

Figure 1 – Minimum elastic displacement as a function of rated speed . 13
Figure 2 – Preferred positions of measurement applicable to one or both ends of the
machine . 14
Figure 3 – Measurement positions for those ends of machines where measurements
according to Figure 2 are not possible without disassembly of parts . 14
Figure 4 – Measurement positions for pedestal bearing . 15
Figure 5 – Preferred circumferential position of transducers for the measurement of
relative shaft displacement . 15
Figure 6 – Measurement positions for vertical machines (measurements to be made at
the bearing housing; when not accessible, then as close as possible) . 16
Figure 7 – Vibration limit diagram for shaft heights H > 132 mm . 17

Table 1 – Limits of maximum vibration magnitude in displacement (r.m.s.) and
velocity (r.m.s.) for shaft height H . 11

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IEC 60034-14:2018 © IEC 2018 – 3 –
Table 2 – Limits for the maximum shaft vibration (S ) and the maximum run-out . 13
p-p

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– 4 – IEC 60034-14:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ROTATING ELECTRICAL MACHINES –

Part 14: Mechanical vibration of certain machines
with shaft heights 56 mm and higher – Measurement,
evaluation and limits of vibration severity

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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6) All users should ensure that they have the latest edition of this publication.
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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60034-14 has been prepared by IEC technical committee 2:
Rotating machinery.
This fourth edition cancels and replaces the third edition, published in 2003, and its
amendment 1, published in 2007. It constitutes a technical revision.
The significant technical changes with respect to the previous edition are:
a) 6.2 is significantly changed to better explain the definition “free suspension”.
b) 6.3: a second method of rigid mount is added since the first method is not always possible
on the test floor.
c) 7.1: an improved option for shaft key is defined.

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IEC 60034-14:2018 © IEC 2018 – 5 –
d) Clause 8: considerable effort to harmonize with NEMA MG 1 and IEEE 841 and API 541,
and also establish levels which are achievable and more in line with best practices.
Table 1 is reduced to two shaft-height range sections.
e) 8.2: definition of twice line frequency simplified along with Figure 7 added.
The text of this International Standard is based on the following documents:
FDIS Report on voting
2/1906/FDIS 2/1914/RVD

Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60034 series, published under the general title Rotating electrical
machines, can be found on the IEC website.
NOTE For A table of cross-references of all IEC TC 2 publications can be found in the IEC TC 2 dashboard on the
IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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– 6 – IEC 60034-14:2018 © IEC 2018
ROTATING ELECTRICAL MACHINES –

Part 14: Mechanical vibration of certain machines
with shaft heights 56 mm and higher – Measurement,
evaluation and limits of vibration severity



1 Scope
This part of IEC 60034 specifies the factory acceptance vibration test procedures and
vibration limits for certain electrical machines under specified conditions, when uncoupled
from any load or prime mover.
It is applicable to DC and three-phase AC machines, with shaft heights 56 mm and higher and
–1
a rated output up to 50 MW, at operational speeds from 120 min up to and including
–1
15 000 min .
This document is not applicable to machines mounted in situ (on site), three-phase
commutator motors, single-phase machines, three-phase machines operated on single-phase
systems, vertical waterpower generators, turbine generators greater than 20 MW and
machines with magnetic bearings or series-wound machines.
NOTE For machines measured in situ, refer to applicable parts of ISO 20816, ISO 10816 and ISO 7919.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60034-1, Rotating electrical machines – Part 1: Rating and performance
IEC 60034-7, Rotating electrical machines – Part 7: Classification of types of constructions
and mounting arrangements (IM Code)
ISO 2954, Mechanical vibration of rotating and reciprocating machinery – Requirements for
instruments for measuring vibration severity
ISO 10817-1, Rotating shaft vibration measuring systems – Part 1: Relative and absolute
sensing of radial vibration from rotating shafts
ISO 20816-1, Mechanical vibration – Measurement and evaluation of machine vibration –
Part 1: General guidelines
ISO 21940-32, Mechanical vibration – Rotor balancing – Part 32: Shaft and fitment key
convention
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60034-1 apply.

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IEC 60034-14:2018 © IEC 2018 – 7 –
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Measurement quantities
4.1 General
Measurement quantities are the vibration displacement and vibration velocity at the machine
bearings and the relative shaft vibration displacement within or near to the machine bearings.
4.2 Vibration magnitude
The criterion for the vibration magnitude at the machine bearings shall be the broadband
r.m.s. value of the vibration displacement in micrometres or the vibration velocity in
millimeters per second in the frequency range specified in Clause 5. The maximum value,
determined at the prescribed measurement positions and prescribed measuring variable,
according to this standard, characterizes the vibration magnitude of the machine.
Induction motors (especially of two pole type) frequently show vibration beating at twice slip
frequency. In these cases, the decisive vibration magnitude shall be determined from the
relationship:
2 2
x + x
max min
x =
r.m.s.
2

where
x is the maximum r.m.s. value of vibration displacement or vibration velocity;
max
x is the minimum r.m.s. value of vibration displacement or vibration velocity.
min
The sample rate shall be chosen large enough to reliably capture the maximum and minimum
values of the vibration.
NOTE Large AC induction machines running at very low slip values at no load may require several minutes to
more than ten minutes for such measurements to be completed at each vibration measuring position.
4.3 Relative shaft vibration
The criterion adopted for the relative shaft vibration shall be the vibratory displacement S in
p-p
the direction of measurement from ISO 20816-1.
5 Measurement equipment
The measurement equipment shall be capable of measuring broadband r.m.s. vibration with
flat response over a frequency range of 10 Hz to 1 000 Hz, in accordance with the
requirements of ISO 2954. However, for machines with speeds approaching or below
–1
600 min , the lower limit of the flat response frequency range shall not be greater than 2 Hz.
Measurement equipment for relative shaft vibration measurements shall comply with the
requirements in ISO 10817-1.
Multi-directional vibration sensors shall not be used.

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– 8 – IEC 60034-14:2018 © IEC 2018
NOTE Multi-directional sensors do not provide proper vibration measurement in all directions when mounted in
only one location.
6 Machine mounting
6.1 General
The vibration of an electrical machine is closely linked with the mounting of the machine. To
permit evaluation as far as balance and vibration of rotating electrical machines are
concerned, it is necessary to measure the vibration on the machine alone, under properly
determined test conditions, to enable reproducible tests to be carried out and to provide
comparable measurements.
6.2 Free suspension
This condition is achieved by suspending the machine on a spring or by mounting on an
elastic support (springs, rubber, etc.).
The hi ghe s t natural oscillation frequency (f ) of the suspension system and machine, shall
no
be less than 1/3 of the frequency f corresponding to the speed of the machine under test, as
1
defined in 7.3. Based on the mass of the machine being tested, the necessary elasticity of the
–1 –1
suspension system as a function of rated speed from 600 min to 3 600 min can be
–1
determined from Figure 1. For speeds lower than 600 min measurements in free suspension
–1
are not practical. For speeds greater than 3 600 min , the static displacement Z should be
–1
not less than the value for 3 600 min .
The curve in Figure 1 presents the minimum elastic displacement to attain the necessary
vertical rigid body natural oscillation, which is usually the highest rigid body natural frequency.
Static displacement Z is expressed as:
2
𝑎𝑎𝑔𝑔 𝑓𝑓
1
𝑍𝑍 =     ,𝑎𝑎 = ; 𝑎𝑎≥ 3
2
(2𝜋𝜋𝜋𝜋) 𝑓𝑓
𝑛𝑛𝑛𝑛
where
Z is the displacement in m,
–1
n is the rated speed in units of s , and
2
g is the acceleration of gravity (9,81 m/s ).
When a is set to 3, then the curve in Figure 1 is generated.
6.3 Rigid mounting
6.3.1 Foundation
6.3.1.1 General
During the shop running test of the assembled machine, vibration measurements shall be
made with the machine properly shimmed and securely fastened to a massive foundation or
test floor stand. Elastic mounts are not permitted.
The horizontal and vertical natural frequencies of the complete test arrangement shall not
coincide within:
a) ± 10 % of the rotational frequency of the machine;
b) ± 5 % of twice the rotational frequency, or
c) ± 5 % of once and twice the electrical line frequency.

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IEC 60034-14:2018 © IEC 2018 – 9 –
Either one of the following two mounting conditions may be chosen by the manufacturer.
6.3.1.2 Rigid mounting on massive foundation
One indication of massive foundation is when the vibration velocity measured in the horizontal
and vertical directions at the machine feet (or at the base frame near to the bearing pedestals
or stator feet) does not exceed 30 % of the maximum velocity, which is measured at the
adjacent bearing housing in the same measurement direction. The ratio of foot to bearing
vibration velocities is valid for the rotational frequency component or twice-line frequency
component (if the latter is being evaluated).
NOTE 1 The rigidity of a foundation is a relative quantity. It is compared with the rigidity of the machine bearing
system. The ratio of bearing housing vibration to foundation vibration is a characteristic quantity for the evaluation
of foundation flexibility.
NOTE 2 If the machine is to be supported in the field by a structure other than a massive foundation, it may be
necessary to perform a system dynamic analysis to make the necessary changes to the foundation dynamic
stiffness.
6.3.1.3 Rigid mounting on test floor stand
This condition is achieved by mounting the machine on an adequately rigid test foundation
free of resonances at forcing frequencies, see 6.3.1.1.
NOTE This mounting is the most used in manufacturers test labs.
6.3.2 Horizontal machines
The machine under test shall be bolted or clamped using all bolt-hole positions to a
foundation that meets the requirements of 6.3.1.2 or 6.3.1.3.
There are constructions and mountings in which the above fixing conditions cannot be met,
such as single-bearing machines. In those cases there should be an agreement between the
supplier and customer.
6.3.3 Vertical machines
Vertical machines shall be mounted onto a solid rectangular or circular steel plate with a bore
hole in the centre of the shaft extension, a machined surface for the flange of electrical
machine being measured and holes provided for fasteners or clamps. The steel plate
thickness shall be at least three times greater than the machine flange thickness, five times is
recommended. The edge length respective to the diameter shall be at least equal to the
height of the top bearing, L. Figure 6 is an example for IM V1 (see IEC 60034-7).
The steel base shall be clamped firmly and tilt safe to a solid floor and meet the requirements
to 6.3.1.2 or 6.3.1.3. The flange connection shall use the correct number of fasteners or
clamps. If the above method of mounting is not reasonable, other arrangements can be per
agreement between supplier and customer.
6.4 Active environment determination
The support systems described in 6.2 and 6.3 are considered passive, admitting insignificant
external disturbances to the machine. When, for the same measurement position, the
vibration magnitude with the machine at standstill exceeds 25 % of the value when the
machine is running, then an active environment is said to exist and this standard does not
apply (see ISO 20816-1).

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– 10 – IEC 60034-14:2018 © IEC 2018
7 Conditions of measurement
7.1 Key
For the balancing and measurement of vibration on machines provided with a shaft extension
keyway, the keyway shall be considered according to ISO 21940-32.
7.2 Measurement positions and directions
7.2.1 Measurement positions for vibration
The location of the preferred measurement positions and directions to which the levels of
vibration magnitude apply are shown in Figure 2 for machines with end-shield bearings and in
Figure 4 for machines with pedestal bearings. Figure 3 applies to those machines where
measurement positions according to Figure 2 are not possible without disassembly of parts.
When measurements cannot be performed per Figure 2 or Figure 3, there should be an
agreement between supplier and customer.
Figure 6 applies to machines mounted in the vertical position.
NOTE 1 Measurement according to Figure 3 might be on the frame as close to the bearing housing as possible.
NOTE 2 Axial vibration measurement may not be possible without disassembly on both ends. If a machine has
thrust bearings, this may be per agreement between supplier and customer, see 8.3.
7.2.2 Measurement positions for relative shaft displacement
Non-contacting transducers shall be installed inside the bearing, measuring directly the
relative shaft journal displacement, or (when inside mounting is not possible) adjacent to the
bearing shell. The preferred radial positions are as indicated in Figure 5.
7.3 Test conditions
Machines shall be tested at no-load with all relevant quantities at their rated value.
Fixed speed AC machines shall be run with a sinusoida
...