EN 50347:2001

SLOVENSKI STANDARD
01-september-2002
General purpose three-phase induction motors having standard dimensions and
outputs - Frame numbers 56 to 315 and flange numbers 65 to 740
General purpose three-phase induction motors having standard dimensions and outputs
- Frame numbers 56 to 315 and flange numbers 65 to 740
Drehstromasynchronmotoren für den Allgemeingebrauch mit standardisierten
Abmessungen und Leistungen - Baugrößen 56 bis 315 und Flanschgrößen 65 bis 740
Moteurs à induction triphasés à usage général de dimensions et puissances normales -
Désignation des carcasses entre 56 et 315 et des brides entre 65 et 740
Ta slovenski standard je istoveten z: EN 50347:2001
ICS:
29.160.30 Motorji Motors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50347
NORME EUROPÉENNE
EUROPÄISCHE NORM July 2001
ICS 29.160.30 Supersedes HD 231 S1:1974
English version
General purpose three-phase induction motors
having standard dimensions and outputs -
Frame numbers 56 to 315 and flange numbers 65 to 740
Moteurs à induction triphasés à usage Drehstromasynchronmotoren für den
général de dimensions et puissances Allgemeingebrauch mit standardisierten
normales - Abmessungen und Leistungen -
Désignation des carcasses entre 56 et Baugrößen 56 bis 315 und
315 et des brides entre 65 et 740 Flanschgrößen 65 bis 740
This European Standard was approved by CENELEC on 2001-03-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50347:2001 E
Contents
Page
1 Scope.4
2 Normative references.4
3 Letter symbols and dimensional sketches.4
3.1 Letter-symbols for dimensions .4
3.2 Dimensional sketches .6
4 Letters for frame sizes and flange numbers .7
5 Location of the terminal box .7
5.1 Machines with feet.7
5.2 Machines with flange only .7
6 Position of holes in the mounting flange (when machine also has feet) .7
7 Fixing dimensions and tolerances.8
7.1 Foot-mounted machines.8
7.2 Flange-mounted machines .9
7.3 Shaft end dimensions .10
7.4 Parallelity of shaft to foot-face .11
7.5 Parallelism of keyway to shaft axis.11
7.6 Lateral displacement of keyway .11
8 Methods of measurement .11
8.1 Shaft extension run-out.11
8.2 Concentricity of spigot and shaft .12
8.3 Perpendicularity of mounting face of flange to shaft .12
8.4 Parallelity of shaft to foot-face .13
8.5 Parallelism of keyway to shaft axis.13
8.6 Lateral displacement of keyway .14
9 Relationships frame sizes - shaft extensions - rated outputs - flange numbers .14

- 3 - EN 50347:2001
Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 2, Rotating
machinery.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by
CENELEC as EN 50347 on 2001-03-01.
This European Standard supersedes HD 231 S1:1974.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2002-03-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2004-03-01
__________
1 Scope
This EN 50347 covers general purpose standard dimensioned three-phase induction motors
for 50 Hz with rated voltages not exceeding 690 V for industrial purposes having dimensions
selected from IEC 60072-1 in the range :
Frame numbers - shaft-heights : 56 mm to 315 mm
Flange numbers - pitch circle diameter of flange : 65 mm to 740 mm
It gives tables of fixing dimensions, shaft extension dimensions and output powers.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and
the publications are listed hereafter. For dated references, subsequent amendments to or
revisions of any of these publications apply to this European Standard only when incorporated
in it by amendment or revision. For undated references the latest edition of the publication
referred to applies (including amendments).
EN 20273, Fasteners - Clearance holes for bolts and screws
EN 20286, ISO system of limits and fits
IEC 60034-7, Rotating electrical machines – Part 7: Classification of types of constructions
and mounting arrangements and terminal box position (IM Code) (harmonized as EN 60034-7)
IEC 60072-1, Dimensions and output series for rotating electrical machines - Part 1: Frame
numbers 56 to 400 and flange numbers 55 to 1080
3 Letter symbols and dimensional sketches
The following symbols identify the dimensional features of a motor. Mandatory dimensions are
marked with an asterisk.
3.1 Letter-symbols for dimensions
*A - distance between centre-lines of fixing holes (end view)
AA - width of the end of the foot (end view)
AB - over-all dimension across the feet (end view)
AC - diameter of the machine
AD - distance from the centre-line of the machine to extreme outside of the terminal box
or other most salient part mounted on the side of the machine
*B - distance between the centre-lines of the fixing holes (side view)
BA - length of the foot (side view)
BB - over-all dimension across the feet (side view)
*C - distance from the shoulder on the shaft at D-end to the centre-line of the mounting
holes in the nearest feet
CA - distance from the shoulder on the shaft at N-end to the centre-line of the mounting
holes in the nearest feet
*CB - rounding fillet at the shoulder on the shaft at D-end
CC - rounding fillet at the shoulder on the shaft at N-end

- 5 - EN 50347:2001
*D - diameter of the shaft extension at D-end
DA - diameter of the shaft extension at N-end
DB - thread-size in the centre hole at D-end
DC - thread-size in the centre hole at N-end
*E - length of the shaft extension from the shoulder at D-end
EA - length of the shaft extension from the shoulder at N-end
*EB - length of the key at D-end
EC - length of the key at N-end
*ED - distance from the shoulder on the shaft at D-end to the nearest end of the keyway
EE - distance from the shoulder on the shaft at N-end to the nearest end of the keyway
*F - width of the keyway or key of the shaft extension at D-end
FA - width of the keyway or key of the shaft extension at N-end
*FB - rounding fillet in the bottom of the keyway at D-end
FC - rounding fillet in the bottom of the keyway at N-end
G - distance from the bottom of the keyway to the opposite surface of the shaft
extension at D-end
*GA - distance from the top of the key to the opposite surface of the shaft extension at D-
end
GB - distance from the bottom of the keyway to the opposite surface of the shaft
extension at N-end
GC - distance from the top of the key to the opposite surface of the shaft extension at N-
end
*GD - thickness of the key of the shaft extension at D-end
*GE - depth of the keyway at the crown of the shaft extension at D-end
GF - thickness of the key of the shaft extension at N-end
GH - depth of the keyway at the crown of the shaft extension at N-end
*H - distance form the centre-line of the shaft to the bottom of the feet (basic dimension)
H' - distance from the centre-line of the shaft to the mounting surface - e.g. the bottom
of the feet in the feet-up version
HA - thickness of the feet
HC - distance from the top of the horizontal machine to the bottom of the feet
HD - distance from the top of the lifting eye, the terminal box or other most salient part
mounted on the top of the machine to the bottom of the feet
HE - distance from the mounting surface to the lowest part of the machine in the feet-up
version
*K - diameter of the holes or width of the slots in the feet of the machine
L - overall length of the machine with a single shaft extension
LA - thickness of the flange
LB - distance from the mounting surface of the flange to the end of the machine
LC - overall length of the machine when there is a shaft extension at N-end
*M - pitch circle diameter of the fixing holes
*N - diameter of the spigot
*P - outside diameter of the flange, or in the case of a non-circular outline twice the
maximum radial dimension
*R - distance from the mounting surface of the flange to the shoulder on the shaft
*S - diameter of the fixing holes in the mounting flange or nominal diameter of thread
*T - depth of the spigot
NOTE 1  The above symbols include all letter symbols listed in IEC 60072-1 supplemented with additional letters
necessary for this EN.
NOTE 2  The definition of D-end and N-end of a motor is given in IEC 60034-7.

3.2 Dimensional sketches
LC
D–end N–end
1)
FF - access to back
FT - no access to back
2)
This ISO symbol indicates the projection method used

- 7 - EN 50347:2001
4 Letters for frame sizes and flange numbers
Letters for frame sizes
S - short length frame size
M - middle length frame size
L - long length frame size
Letters for flange numbers
FF - flange with free holes
FT - flange with tapped holes
5 Location of the terminal box
5.1 Machines with feet
The terminal box on a motor shall be situated with its centre-line within a sector ranging from
the top to 10° below the horizontal centre-line of the motor on the right-hand side, when
looking at the D-end of the motor.
It is recommended that unless the terminal box is on the top, motors be so constructed that
the terminal box may be located on the left-hand side viewed from the D-end by the
manufacturer if requested by the user at the time when the motor is ordered.
NOTE   Provision should preferably be made so as to enable the cable entry to the terminal box to be in any one
of four directions at right angles.
5.2 Machines with flange only
No recommendation.
6 Position of holes in the mounting flange (when machine also has feet)
When a foot-mounted machine is also provided with a flange, the holes in the flange shall be
placed in the angular position shown in the sketches of 3.2.

7 Fixing dimensions and tolerances
7.1 Foot-mounted machines
Table 1 - Dimensions for machines with shaft-heights from 56 mm to 315 mm
1)
Frame H A B C K Bolt
number Nominal Maximum Nominal or
deviation
screw
mm mm mm mm mm
mm
56M 56 - 0,5 90 71 36 5,8 M5
63M 63 - 0,5 100 80 40 7 M6
71M 71 - 0,5 112 90 45 7 M6
80M 80 - 0,5 125 100 50 10 M8
90S 90 - 0,5 140 100 56 10 M8
90L 90 - 0,5 140 125 56 10 M8
100L 100 - 0,5 160 140 63 12 M10
112M 112 - 0,5 190 140 70 12 M10
132S 132 - 0,5 216 140 89 12 M10
132M 132 - 0,5 216 178 89 12 M10
160M 160 - 0,5 254 210 108 14,5 M12
160L 160 - 0,5 254 254 108 14,5 M12
180M 180 - 0,5 279 241 121 14,5 M12
180L 180 - 0,5 279 279 121 14,5 M12
200M 200 - 0,5 318 267 133 18,5 M16
200L 200 - 0,5 318 305 133 18,5 M16
225S 225 - 0,5 356 286 149 18,5 M16
225M 225 - 0,5 356 311 149 18,5 M16
250S 250 - 0,5 406 311 168 24 M20
250M 250 - 0,5 406 349 168 24 M20
280S 280 - 1 457 368 190 24 M20
280M 280 - 1 457 419 190 24 M20
315S 315 - 1 508 406 216 28 M24
315M 315 - 1 508 457 216 28 M24
1) The nominal K dimensions are selected from the coarse series in EN 20273 and have a tolerance of H17 to
EN 20286. For closed slots the tolerance applies to the width of the slot. Open ended slots are not permitted.
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