EN 61800-1:1998

SLOVENSKI STANDARD
01-junij-2001
Adjustable speed electrical power drive systems - Part 1: General requirements -
Rating specifications for low voltage adjustable speed d.c. power drive systems
(IEC 61800-1:1997)
Adjustable speed electrical power drive systems -- Part 1: General requirements - Rating
specifications for low voltage adjustable speed d.c. power drive systems
Drehzahlveränderbare elektrische Antriebe -- Teil 1: Allgemeine Anforderungen -
Festlegungen für die Bemessung von Niederspannungs-Gleichstrom-Antriebssystemen
Entraînements électriques de puissance à vitesse variable -- Partie 1: Exigences
générales - Spécifications de dimensionnement pour systèmes d'entraînement de
puissance à vitesse variable en courant continu et basse tension
Ta slovenski standard je istoveten z: EN 61800-1:1998
ICS:
29.200 8VPHUQLNL3UHWYRUQLNL Rectifiers. Convertors.
6WDELOL]LUDQRHOHNWULþQR Stabilized power supply
QDSDMDQMH
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME
CEI
INTERNATIONALE
IEC
61800-1
INTERNATIONAL
Première édition
STANDARD
First edition
1997-12
Entraînements électriques de puissance
à vitesse variable –
Partie 1:
Exigences générales – Spécifications de
dimensionnement pour systèmes d’entraînement
de puissance à vitesse variable en courant continu
et basse tension
Adjustable speed electrical power drive systems –
Part 1:
General requirements – Rating specifications
for low voltage adjustable speed d.c. power
drive systems
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CODE PRIX
Commission Electrotechnique Internationale
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International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue

61800-1  IEC:1997 – 3 –
CONTENTS
Page
FOREWORD . 7
Clause
1 General . 9
1.1 Scope and object . 9
1.2 Normative references. 9
1.3 Symbols. 13
2 Definitions . 15
2.1 System . 15
2.2 Converters . 21
2.3 Drive system operating characteristics . 23
2.4 CDM, BDM and converter input parameters . 27
2.5 CDM, BDM and converter output parameters. 31
2.6 Converter circuitry and circuit elements . 35
2.7 Motors . 35
2.8 Control systems . 37
3 Functional features . 37
3.1 Operational . 37
3.2 Fault supervision. 39
3.3 Minimum status indication required. 39
3.4 I/O devices. 39
4 Service conditions . 39
4.1 Installation and operation . 39
4.1.1 Electrical service conditions . 39
4.1.2 Environmental service conditions. 47
4.1.3 Unusual environmental service conditions. 49
4.1.4 Installation, commissioning and operation. 49
4.2 Storage of equipment . 49
4.2.1 Climatic conditions . 49
4.2.2 Specific storage hazards . 51
4.3 Transportation. 51
4.3.1 Climatic conditions . 51
4.3.2 Unusual climatic conditions . 51
4.3.3 Mechanical conditions . 53

61800-1  IEC:1997 – 5 –
Clause Page
5 Ratings. 53
5.1 BDM input ratings. 53
5.2 BDM output ratings . 55
5.3 Efficiency and losses. 59
5.4 Ripple . 59
5.5 Transformers and reactors . 61
6 Performance requirements. 61
6.1 Steady-state performance . 61
6.2 Dynamic performance . 65
6.3 Dynamic braking and dynamic slowdown . 65
6.4 Other performance requirements. 67
7 Tests . 69
7.1 Classification of tests . 69
7.2 Performance of tests. 71
7.3 Items of separate device tests. 71
7.4 Items of power drive system tests. 75
8 Product information . 89
8.1 Marking. 89
8.2 Information to be supplied with the PDS or CDM/BDM . 89
9 Safety and warning labels . 91
9.1 Warning labels . 91
9.2 Safety and nature of a PDS . 93
Annexes
A Motor considerations . 95
B Line-side considerations . 109
C Auxiliary equipment . 139
D Control strategies . 145
E Protection. 179
F Topologies. 189
G Monitoring features . 201

61800-1  IEC:1997 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
ADJUSTABLE SPEED ELECTRICAL POWER DRIVE SYSTEMS −
Part 1: General requirements – Rating specifications for low voltage
adjustable speed d.c. power drive systems
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61800-1 has been prepared by subcommittee 22G: Semiconductor
power converters for adjustable speed electric drive systems, of IEC technical committee 22:
Power electronics.
The text of this standard is based on the following documents:
FDIS Report on voting
22G/39/FDIS 22G/42/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
Annexes A, B, C, D, E, F, and G are for information only.

61800-1  IEC:1997 – 9 –
ADJUSTABLE SPEED ELECTRICAL POWER DRIVE SYSTEMS −
Part 1: General requirements – Rating specifications for low voltage
adjustable speed d.c. power drive systems
1 General
1.1 Scope and object
This part of IEC 61800 applies to general purpose adjustable speed d.c. drive systems which
include the power conversion, control equipment, and also a motor or motors. Excluded are
traction and electrical vehicle drives.
It applies to power drive systems (PDS) connected to line voltages up to 1 kV a.c., 50 Hz or
60 Hz.
EMC aspects are covered in IEC 61800-3.
This part of IEC 61800 gives the characteristics of the converters and their relationship with the
complete d.c. drive system. It also states their performance requirements with respect to
ratings, normal operating conditions, overload conditions, surge withstand capabilities, stability,
protection, a.c. line earthing, and testing. Furthermore, it deals with application guidelines,
such as control strategies, diagnostics, and topologies.
This part of IEC 61800 is intended to define a complete d.c. PDS in terms of its performance
and not in terms of individual subsystem functional units.
1.2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 61800. At the time of publication, the editions indicated
were valid. All normative documents are subject to revision, and parties to agreements based
on this part of IEC 61800 are encouraged to investigate the possibility of applying the most
recent editions of the normative documents indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
IEC 60034-1: 1994, Rotating electrical machines – Part 1: Rating and performance
IEC 60034-2: 1972, Rotating electrical machines – Part 2: Methods for determining losses and
efficiency of rotating electrical machinery from tests (excluding machines for traction vehicles)
IEC 60034-9: 1990, Rotating electrical machines – Part 9: Noise limits
IEC 60038: 1983, IEC standard voltages
IEC 60050 (111): 1996, International electrotechnical vocabulary (IEV) – Chapter 111: Physics
and chemistry
IEC 60050 (151): 1978, International electrotechnical vocabulary (IEV) – Chapter 151:
Electrical and magnetic devices

61800-1  IEC:1997 – 11 –
IEC 60050 (441): 1984, International electrotechnical vocabulary (IEV) – Chapter 441: Switchgear,
controlgear and fuses
1)
IEC 60050 (551): International electrotechnical vocabulary (IEV) – Chapter 551: Power electronics
IEC 60050 (601): 1985, International electrotechnical vocabulary (IEV) – Chapter 601: Generation,
transmission and distribution of electricity – General
IEC 60076, Power transformers
IEC 60146-1-1: 1991, Semiconductor convertors. Common specifications and line commutated
convertors – Part 1-1: Specification of basic requirements
IEC 60146-1-2: 1991, Semiconductor convertors. Common specifications and line commutated
convertors – Part 1-2: Application guide
IEC 60146-1-3: 1991, Semiconductor convertors. Common specifications and line commutated
convertors – Part 1-3: Transformers and reactors
IEC 60204-1: 1992, Electrical equipment of industrial machines – Part 1: General requirements
IEC 60364-4-41: 1992, Electrical installations of buildings of buildings – Part 4: Protection for
safety – Chapter 41: Protection against electric shock
IEC 60529: 1989, Degrees of protection provided by enclosures (IP code)
IEC 60664-1: 1992, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 60721-3-1: 1987, Classification of environmental conditions – Part 3: Classification of
groups of environmental parameters and their severities. Storage
IEC 60721-3-2: 1997, Classification of environmental conditions – Part 3: Classification of
groups of environmental parameters and their severities. Transportation
IEC 60721-3-3: 1994, Classification of environmental conditions – Part 3: Classification of
groups of environmental parameters and their severities – Section 3: Stationary use at weather
protected locations
IEC 61000-2-4: 1994, Electromagnetic compatibility (EMC) – Part 2: Environment – Section 4:
Compatibility levels in industrial plants for low frequency conducted disturbances
IEC 61000-4-7: 1991, Electromagnetic compatibility (EMC) – Part 4: Testing and measurement
techniques – Section 7: General guide on harmonics and interharmonics measurements and
instrumentation, for power supply systems and equipment connected thereto
IEC 61136-1: 1992, Semiconductor power convertors – Adjustable speed electric drive systems –
General requirements – Part 1: Rating specifications, particularly for d.c. motor drives
IEC 61800-3: 1996, Adjustable speed electrical power drive systems – Part 3: EMC product
standard including specific test methods
IEC guide 106: 1989, Guide for specifying environmental conditions for equipment performance
rating
_______
1)
Second edition, to be published.

61800-1  IEC:1997 – 13 –
1.3 Symbols
Table 1 lists symbols defined and/or used in this part of IEC 61800.
Table 2 lists symbols and units for motor parameters.
Table 1 – Symbols
Parameter Symbol Unit Definition
Rated system voltage U V 2.4.1
LN
Rated system frequency f Hz 2.4.2
LN
Line-side converter rated a.c. voltage U V 2.4.3
VN
Line-side rated a.c. current of the CDM/BDM I A 2.4.4
LN
Rated input current of the converter I A 2.4.5
VN
Line-side harmonic content H V ou A 2.4.6
L
Line-side total harmonic distortion THD % 2.4.8
Converter input displacement factor 2.4.9
cos ϕ
V1
Line-side displacement factor 2.4.10
cos ϕ
L1
Input total power factor 2.4.11
λ
L
Maximum a.c. system, I A 2.4.12
SCM
symmetrical short-circuit current
Short-circuit ratio R 2.4.12
SC
DC current I A 2.5.1
d
Rated continuous output current I A 2.5.2
dN
Overload output current (overload capability) I A 2.5.3
dM
Rated output voltage U V 2.5.5
dN
Voltage ripple content U V 2.5.6
pp
Current ripple content I A 2.5.6
pp
Efficiency of drive system % 2.5.8
η
D
Efficiency of CDM % 2.5.8
η
C
Base speed N r/min 2.7.3
Maximum operating speed N r/min
M
Minimum operating speed N r/min
min
Maximum safe motor speed N r/min 2.7.4
smax
Torque M Nm
2 2
Inertia J kgm or Nms
61800-1  IEC:1997 – 15 –
Table 2 – Symbols for motor parameters
Parameter Symbol Unit
Rated output power P kW
N
Rated armature voltage U V
AN
Rated armature current I A
AN
Peak load current value I A
p
–1
Allowable rate of change of the armature current dI /dt As
A
Allowable ripple of the armature current I A
ppM
Armature inductance L H
A
Armature resistance R
Ω
A
Rated hot field voltage U V
FN
Rated field current I A
FN
Field current for maximum speed I A
FNm
Field inductance L H
F
Field resistance R
Ω
F
Base speed N r/min (note 1)
Maximum speed N r/min
M
Maximum safe motor speed N r/min
smax
Torque (note 2) M Nm
2 2
Inertia J kgm or Nms
NOTE 1 – Practically, speed is expressed in RPM as well.
NOTE 2 – Torque/speed characteristics: see A.5.1.
2 Definitions
For the purpose of this part of IEC 61800, the following definitions, as well as those given in
IEC 60050 (111), IEC 60050 (151), IEC 60050 (441), IEC 60050 (551), IEC 60050 (601),
IEC 60146-1-1, IEC 60146-1-2, IEC 60146-1-3, and IEC 61136-1 apply.
2.1 System
2.1.1
d.c. power drive system (PDS) (see figure 1)
system consisting of power equipment (composed of converter section, d.c. motor and other
equipment such as, but not limited to, the feeding section or the field supply), and control
equipment (composed of switching control – on/off for example – speed control, current control,

61800-1  IEC:1997 – 17 –
firing system, field control, protection, status monitoring, communication, tests, diagnostics,
process interface/port, etc.)
NOTE – Figure 1 illustrates the main functional elements of a d.c. drive system. It also includes equipment which
may be optional on many drive systems. It is intended to encompass a wide variety of d.c. drive configuration
possibilities. The converter section does not illustrate or imply a specific topology, or type of switching device, due
to the wide variety of both in current use. See annex F.
2.1.2
d.c. power drive system – hardware configuration
PDS which consists of a complete drive module (CDM) and a motor or motors with sensors
which are mechanically coupled to the motor shaft (the driven equipment is not included). See
figure 2 for hardware partition of the power drive system
NOTE – Figure 2 illustrates the parts of equipment which can be grouped and supplied as defined and shown.
2.1.2.1
basic drive module (BDM)
drive module which consists of, a converter section, a control equipment for speed, torque,
current or voltage, and a power semiconductor gating system, etc.
2.1.2.2
complete drive module (CDM)
drive system, without the motor and the sensors which are mechanically coupled to the motor
shaft, consisting of, but not limited to, the BDM, and extensions such as feeding section, field
supply, and auxiliaries
2.1.2.3
installation
equipment or equipments which include at least both the PDS and the driven equipment

61800-1  IEC:1997 – 19 –
Feeding  line
Actual  value
Control equipment Power equipment

of  signalisation
Electrical
junction line
Control  Switching Input  short-circuit
I >
on / off
a.c.  switch
circuit-breaker
on
Main
> 1
circuit
Transformer  :
off p >
Gas  warning
Feeding
Auxiliaries     Gas  fault
& p >
Excess.  temp.
Excessive temperature section
T >
Capac.  overvoltage
Earth  fault
I >
Protection
Drive  overload
monitoring
status
>
I >
Over current  (solid -state)
& > 1
UnUnder voltagedervoltage
V <
Converter fuses
I >
M
Inverting fault
p <
Convertor Fan
Converter
d.c. switch section
d.c. Switch
circuit-breaker
Continuous  variables
Control
I >
Armature short circuit
A r m a t u r e
speed    current    gate
Dynamic braking
=
Armature overvoltage V >
F i e l d
field     current    gate
=
=
=
Encoder/
Resolver /
Coupling
Tachometer
mechanical
junction line
Armature
voltage
M
Armature
Actual Values Arm. Position Speed Arm.
current
of the Variables voltage current
Communication
test  diagnostics
Driven
equipment
Field current
Windings Temperature  T >
p <
MMotor vent. air flowotor ventilation air flow
Motor ventilation
Motor vent. excess.
Motor Ventilation M
excessive temperature
temp.
T >
Under excitation
I <
Process  interface / port
and  signalisation
Normal field
Field  economy
Field
supply
Field overload
IEC  1 619/97
Figure 1 – Function diagram of a d.c. – drive system

61800-1  IEC:1997 – 21 –
Installation or part of installation
PDS (Power Drive System)
CDM (Complete Drive Module)
System control and sequencing
BDM (Basic Drive Module)
Control,
converter
and protection
Feeding section
Field supply
Auxiliaries
Others
Motor and sensors
Driven equipment
IEC  1 620/97
Figure 2 – PDS hardware configuration within an installation
2.2 Converters
2.2.1
converter, general purpose
operating unit for electronic power conversion, changing one or more electrical characteristics
and comprising one or more electronic switching devices and associated components, such as
transformers, filters, commutation aids, controls, protections and auxiliaries, if any
2.2.2
rectifying – rectification
converter action converting from a.c. to d.c. The rectifier can be uncontrolled or controlled
[IEV 551-11-06 modified]
NOTE – For the purpose of this part of IEC 61800, the line-side converter normally operates as a rectifier.

61800-1  IEC:1997 – 23 –
2.2.3
inverting – inversion
converter action converting from d.c. to a.c. [IEV 551-11-07 modified]
NOTE – For the purpose of this part of IEC 61800, the line-side converter sometimes operates as an inverter.
2.2.4
converter, d.c. linked
converter comprising a rectifier and a chopper with an intermediate d.c. link
2.2.5
converter, line-side commutated
converter in which the commutation voltages are supplied by the a.c. input
2.2.6
chopper
converter operating a d.c. conversion (d.c. to d.c.) by means of electronic devices using forced
commutation. Its output delivers adjustable d.c. voltage [IEV 551-12-28 modified]
NOTE – In this part of IEC 61800, forced commutation refers to deliberate extinction of semiconductor device
before commutation can take place at zero current (natural commutation).
2.2.7
converter, voltage source
converter which provides an adjustable output voltage supply, essentially unaffected by the
value of the load
NOTE – The term "voltage stiff a.c./d.c converter" having a similar physical background is used in the second
edition of IEV 50(551).
2.3 Drive system operating characteristics
2.3.1
two quadrant operation
converter operation of a machine as a motor in one direction of machine rotation and as a
generator in the opposite direction of rotation. It involves operation in quadrant I and II of the
torque / speed diagram (see figure 3)
2.3.2
four quadrant operation
converter operation of a machine as either a motor or a generator in either direction of machine
rotation. It involves operation in quadrants I, II, III & IV of the torque / speed diagram as shown
in figure 3
NOTE – Concerning the combinations of current flow and voltage direction, see figures 1, 2 and 3 of IEC 61136-1,
where voltage and current axis have been inverted (current corresponding to torque, and voltage to speed).
2.3.3
dynamic braking
process of converting the rotational energy of the armature and connected inertial load to
electrical energy dissipated in a resistance
2.3.4
regeneration
process of converting the mechanical energy of the system to electrical energy and transferring
it to the input supply. The motor is then working as a generator and the ratings of the motor
may be different
61800-1  IEC:1997 – 25 –
M
M
One
Torque
quadrant
I
NN
Speed
Two
M
M
quadrants
II I
N
N
Four
M
M
quadrants
II I
NN
IV
III
IEC  1 621/97
Figure 3 – Operating quadrants

61800-1  IEC:1997 – 27 –
2.4 CDM, BDM and converter input parameters
Symbols defined in 2.4 are included in table 1.
2.4.1
rated system voltage U
LN
RMS input line-to-line voltage at the supply terminals of the customers installation to which the
PDS will be connected
2.4.2
rated system frequency f
LN
frequency in Hertz of the power input system alternating voltage
2.4.3
line-side rated a.c. voltage U
VN
rated r.m.s. line-to-line input voltage at the a.c. terminals of the line-side converter, which has
been designated as the basis for the converter rating
NOTE – This voltage may differ from the rated system voltage U due to the use of transformers and the effect of
LN
impedance. Some drives may have an input transformer with primary voltage higher than 1 000 V. In this case, the
transformer and protective devices have to meet this standard and other relevant IEC standards. Capacitively
coupled high voltage from primary to secondary winding must be bypassed to earth (see annex B).
2.4.4
line-side rated a.c. current I
LN
maximum r.m.s. value of current on the line-side of the CDM/BDM under rated conditions. It
takes into account rated load and the most onerous combination of all other conditions within
their specified ranges, for example line voltage and frequency deviations
NOTE – This current includes currents supplied to the auxiliary circuits of the CDM/BDM. It takes into account the
effect of d.c. current ripple and circulating current, if any.
2.4.5
rated input current I
VN
maximum r.m.s. value of current on the valve side of the converter under rated conditions. It
takes into account rated load and the most onerous combination of all other conditions within
their specified ranges, for example line voltage and frequency deviations
2.4.6
line-side harmonic content
quantity obtained by subtracting from an alternating quantity its fundamental component
[IEV 551-07-04, applied to the line-side of the system]
NOTE – For example, for voltage (from a practical approach and with interharmonics neglected), the r.m.s. value of
the harmonic content is
=
h n
2 05,
UU=()
Hn ∑ h
=
h2
2.4.7
characteristic current harmonics
orders of the current harmonics produced by converter equipment in the course of normal
operation. For example, in a 6-pulse converter the characteristic current harmonics are the non
triple, odd harmonics: h = 6 k ± 1 (k any integer)
NOTE – In addition to power system frequency harmonics, there can be other harmonics resulting from interaction
with the converter load. They are called interharmonics.

61800-1  IEC:1997 – 29 –
2.4.8
harmonic distortion
according to common practice, the total harmonic distortion coefficient is relative to the
fundamental component of the quantity which is considered. The harmonic factor is relative to
the r.m.s. value of the quantity which is considered [IEV 551-17-05 and IEC 551-17-06,
modified]
THD and THF are defined by:
2 2 2 2
− −
QQ QQ
1 1
THD = THF =
and
Q Q
where
Q is the r.m.s. value of the fundamental;
Q is the total r.m.s. value;
h is the harmonic order;
Q is the r.m.s. value of harmonic component of order h;
h
Q can represent either current or voltage.
For the purpose of this standard and for clarity, limits are referred to the corresponding rated value.
Limits for THD and THF are defined by:
2 2 2 2
− −
QQ QQ
1 1
THD = and THF =
Q Q
1N N
NOTE 1 – These definitions are in accordance with the second edition of IEV 551 and with common practice. The
network voltage waveform is much less distorted than the injected current. Therefore, application of both
definitions, total harmonic distortion coefficient THD or total harmonic factor THF, to the voltage provides the same
result while the difference is significant when current is considered.
NOTE 2 – It is important to note that these definitions include interharmonics. When interharmonics are present the
wave form is no longer periodical, which can produce more complex effects than those produced by harmonics. If
interharmonics are negligible, these equations simplify to:
h=40 h=40
2 2
Q Q
∑ ∑
h h
h=2 h=2
THD = and THF =
Q Q
1N N
where
Q is the rated r.m.s. value of the fundamental;
1N
Q is the rated total r.m.s. value.
N
The summation is extended to and includes order 40, according to IEC common practice.
NOTE 3 – For particular use, the highest frequency content of THD (order h from 14 to 40 inclusive) is named
partial harmonic distortion coefficient PHD, and the even content (where order h is only even) is named even
harmonic distortion coefficient EHD. Applied to current this gives:
=
h=40 h 40 2
∑
∑ I
I h
= h he=2,ven
h 14
= =
PHD and EHD
I I
1N 1N
61800-1  IEC:1997 – 31 –
2.4.9
converter input displacement factor cos ϕϕ
V1
cosine of the phase displacement angle between the fundamental phase components of the
voltage and current on the input a.c. side of the input power converter
2.4.10
line-side displacement factor cos ϕϕ
L1
cosine of the phase displacement angle between the fundamental phase components of the
voltage and current on the input a.c. side of the CDM
2.4.11
input total power factor, λλ
L
ratio of the total power input, to the apparent power, as determined at the connection of the
CDM to the supply
Example: in a three-phase system where the voltage is considered sinusoidal.
λ = (U I 3 cos ϕ ) / (U I 3)
L L L1 L1 L L
=(I / I ) × cos ϕ
L1 L L1
NOTE 1 – The power factor includes the effect of displacement cos ϕ and of harmonics by means of the
deformation factor ν = λ / cos ϕ.
NOTE 2 – The definition applies to the converter input (subscript V) or to the CDM input line-side (subscript L).
2.4.12
maximum allowable a.c. system, symmetrical short-circuit current I
SCM
maximum allowable symmetrical short-circuit current (I ), as specified on the rating plate
SCM
can be related to the fundamental component of the line-side rated a.c. current (I ) by means
LN1
of the short-circuit ratio (R )
SC
is the ratio of the short-circuit power of the source to the fundamental apparent power on
R
SC
the line-side of the converter(s). (See IEC 60146-1-1.)
R = S / S = I / I
SC SC LN1 SC LN1
The maximum allowable symmetrical short-circuit current (I ) is of importance in the
SCM
definition of the protection of the converter. At the point of common coupling (PCC), the relative
short-circuit power shall be considered (see 1.5.35 of IEC 60146-1-1). This R has to be
SC
limited to the following R :
SCM
R = I / I
scm SCM LN1
where I is equal to the fundamental content of I .
LN1 LN
2.5 CDM, BDM and converter output parameters
Symbols defined in 2.5 are included in table 1.
2.5.1
d.c. current I
d
average value of the current in the d.c. link over one full period of the input power system
frequency
NOTE – DC current I can also indicate the current of the intermediate d.c. link in the case of an indirect converter
d
using a chopper. Generally I is used to indicate the output current which is also the motor current.
A
61800-1  IEC:1997 – 33 –
2.5.2
rated continuous output current I
dN
output current which can be supplied continuously without exceeding established limits, under
prescribed operating conditions
NOTE – IEC 61136-1 gives different classes of rated current for complex cases of load duty.
2.5.3
overload capability I
dM
maximum output current which can be supplied for a specified period of time, without
exceeding established limits under prescribed operating conditions
2.5.4
continuous output rating P
dN
active power which a converter is capable of supplying to a load continuously without
exceeding established limits
2.5.5
rated output voltage U
dN
specified value at rated d.c. current of the direct voltage between d.c. terminals of the
CDM/BDM. This value is the available mean value of the d.c. voltage under usual service
conditions, as specified in clause 4
2.5.6
ripple U , I
pp pp
periodic a.c. voltage/current superimposed on steady direct voltage/current, usually expressed
as peak-to-peak value. If the ripple content of the current is given as peak-to-peak value in
amperes measured or calculated at rated voltage of the motor, then the symbol is I
ppN
NOTE – Current ripple is also given as a ratio r = I / I where I is the mean value of output current (see B.4.3.2),
,
pp d d
but r/2 is often used in the definition of the motor parameters. It is important to clarify which ratio is used.
2.5.7
load-side harmonic content
function obtained by subtracting the d.c. component from the non-sinusoidal periodic function
on the output side of the converter. For example, the r.m.s. value of the current harmonic
content is
h=n
20,5
II=()
dHn ∑h
h=2
In practice n is limited to 40.
2.5.8
efficiency of power conversion ηη , ηη
D C
efficiency ηη of the drive system is the ratio of the power delivered by the motor shaft to the
D
total power drawn from the input power supply (see feeding line in figure 1), and is usually
expressed as a percentage. Efficiency of the CDM (complete drive module) ηη is the ratio of
C
the total output power delivered by the CDM to armature, field, and auxiliaries (motor
ventilation fan, etc.) to the total power drawn from the input power supply (see feeding line in
figure 1), and is usually expressed as a percentage
2.5.9
maximum field supply current I
FM
maximum continuous mean current of the motor field load that the field converter can supply
NOTE – If an uncontrolled field converter is used, the converter has to be sized for the maximum field current, with
a cold motor.
61800-1  IEC:1997 – 35 –
2.5.10
rated field supply voltage U
FN
rated mean voltage of the motor field load to be connected to the field converter
2.6 Converter circuitry and circuit elements
2.6.1
commutating capacitor
capacitor which provides commutating energy for self-commutated thyristors in a self-
commutated chopper
2.6.2
commutating inductor
inductor having one or more windings which modifies or couples the transient current produced
during commutation
2.6.3
a.c. filter network
network designed to reduce the flow of harmonic currents into the associated power system
2.6.4
power factor correction network
network designed to improve the power factor of the associated power system. This network
will frequently also reduce the flow of harmonic currents
2.6.5
d.c. filter capacitor
capacitor connected across the rectifier output within a converter to reduce voltage ripple
2.7 Motors
2.7.1
d.c. motor types
DC motors are typically equipped with separate field (see figure 1). This type of motor can be
compensated or not. The purpose of compensation is to minimize the armature reaction and
increase the motor commutating ability.
NOTE – Other types of motors are: permanent magnet motor, series field, combinations (shunt and series).
2.7.2
rated hot field voltage
rated field voltage at operational temperature
2.7.3
base speed N
speed obtained with rated armature voltage, with rated armature current and rated field current,
usually the breakpoint speed between constant torque and constant power operation

61800-1  IEC:1997 – 37 –
2.7.4
maximum safe motor speed
maximum designed speed of the motor under which no permanent abnormal mechanical
deformation or weakness is introduced (see clause 21 of IEC 60034-1)
NOTE – The maximum safe speed of the driven equipment may be more restrictive.
2.7.5
torque pulsation
cyclic fluctuation of a steady-state motor torque measured as a peak-to-peak variation
2.8 Control systems
2.8.1
controlled variable
system variable in the feedback control of adjustable d.c. drives. Some examples of controlled
variables are speed, armature voltage, armature and field current
2.8.2
service variable
specified variable, usually related to ambient conditions (e.g. temperature), for which the
feedback control system is to correct in attempting to maintain the ideal value of the controlled
variable
2.8.3
operating variable
specified variable (e.g. load torque for a speed controlled drive) other than those arising from
service conditions and drift for which the feedback control system is to correct in attempting to
maintain the ideal value of the controlled variable
2.8.4
feedback control system variables
range of service and operating variables covering the total deviations for which the feedback
system attempts to correct by means of the controlled variables. The accuracy of this control is
then defined as the width of the band of allowable deviation within which the feedback system
will regulate the controlled variable
3 Functional features
3.1 Operational
CDM shall include specified features which may include, but are not limited to, one or more of
the following features:
– timed acceleration;
– timed deceleration;
– jog;
– adjustable current limit(s);
– dynamic braking;
– reversing;
– regeneration;
– line filtering;
– input/output data processing (analog/digital);
– automatic restart.
61800-1  IEC:1997 – 39 –
3.2 Fault supervision
The CDM shall provide specified fault indication. This may consist of a common alarm and/or
trip signal provided via dry relay contact(s) or static relay(s). The fault indication is normally
activated by one or more of the CDM faults which may include but are not limited to the
following:
– external faults;
– fuse(s) blown;
– instantaneous overcurrent;
– overtemperature (converter);
– loss of cooling air;
– motor overload;
– auxiliary power supply fault;
– supply over/undervoltage;
– supply phase loss;
– motor overvoltage;
– overspeed and/or tachometer loss protection;
– field loss protection;
– internal control system fault;
– regulator/power circuit diagnostics.
3.3 Minimum status indication required
The CDM shall be equipped with status indication signals for "drive on" (whether rotating or at
standstill). The CDM may also be equipped with a status indication signal "drive ready for
operation".
3.4 I/O devices
Number and nature of I/O shall be stated by the manufacturer. Any modification shall be
agreed upon between the manufacturer and user.
NOTE – Inputs and outputs are needed for both variables and parameters. They are provided through analog or
digital inputs/outputs using voltage or current. They are communicated through serial or parallel links according to
various communication standards. Both analog and digital variables can be manually set by use of a control panel
and can be read on displays. Variables and parameters are treated in the same manner.
4 Service conditions
4.1 Installation and operation
Unless modified, the equipment which is within the scope of this part of IEC 61800 shall be
capable of operation under the conditions listed in 2.2 and 2.3 of IEC 60146-1-1, and
IEC Guide 106.
4.1.1 Electrical service conditions
Unless otherwise specified, the CDM or BDM shall be designed to operate under the service
conditions specified below. The values specified include the effect of the drive system being
considered.
61800-1  IEC:1997 – 41 –
EMC requirements for power drive systems are stated in IEC 61800-3.
NOTE – The limits specified in 4.1.1.1 to 4.1.1.5 link the EMC standards to existing practice in semiconductor
converters given in 2.5.1, 2.5.2 and 2.5.3 of IEC 60146-1-1, and correspond generally to class B.
4.1.1.1 Frequency variations
Frequency f ± 2 % (±4 % for separated supply network) according to class 3 defined in
LN
IEC 61000-2-4.
Rate of change of frequency ≤2 % f /s.
LN
(See also 5.2.3.2 of IEC 61800-3.)
4.1.1.2 Voltage changes
Voltage limits for uninterrupted operation
PDS rated input voltage ±10 % (at the point of coupling PC), according to class 2 defined in
IEC 61000-2-4 (see also 5.2.2.1 and 5.2.2.2 of IEC 61800-3).
NOTE – Short time voltage variation beyond the levels specified may result in interruption of operation or tripping.
If continuous operation is necessary, an agreement is required between the user and the supplier/manufacturer.
Voltage limits for rated performance
Rated converter performance shall be maintained when the steady-state fundamental
component of the line a.c. supply voltage is equal to or greater than 100 % and equal to or less
than 110 % of the rated value measured at the terminals of the BDM. Rated operation at
voltages below 100 % of rated voltage shall be subject to agr
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