Nidec Leroy-Somer Powerdrive MD Smart Quick setup guide

Powerdrive MD Smart
MD3 IP00 Chassis serie
Integration Guide
Reference: 5751 en - 2021.10 / e

2
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
Nidec Leroy-Somer reserves the right to modify the characteristics of its products at any time to incorporate the latest technological
developments. The information contained in this document may therefore be changed without notice.
CAUTION
For the user’s safety, the Powerdrive MD Smart variable speed drive made by the integrator must be connected to a
statutory ground (terminal ).
If an inadvertent start to the installation presents a risk to the persons or the machines being driven, it is essential to
comply with the power connection diagrams recommended in this manual.
The Powerdrive MD Smart variable speed drive is tted with safety devices which, in the event of a problem, control
stopping and thus stop the motor. The motor itself can become jammed for mechanical reasons. Voltage uctuations, in
particular power cuts, may also cause the motor to stop. The removal of the causes of the shutdown can lead to restarting,
which may be dangerous for certain machines or installations, in particular those which must comply with Appendix 1 of
Decree 92.767 of 29 July 1992 on safety.
In such cases, it is essential that the user takes appropriate precautions against the motor restarting after an unscheduled
stop.
The Powerdrive MD Smart variable speed drive is designed to be able to supply a motor and the driven machine above its
rated speed.
If the motor or the machine are not mechanically designed to withstand such speeds, the user may be exposed to serious
danger resulting from their mechanical deterioration.
Before programming a high speed, it is important that the user checks that the installation can withstand it.
The Powerdrive MD Smart variable speed drive, made from the components described in this manual, is designed to be
integrated in an installation or an electrical machine, and can under no circumstances be considered a safety device It is
therefore the responsibility of the machine manufacturer, the designer of the installation or the user to take all necessary
precautions to ensure that the system complies with current standards, and to provide any devices required to ensure
the safety of equipment and personnel.
In the event of non-compliance with the above provisions, Leroy-Somer disclaims any and all liability.
This manual describes all the steps required for a system integrator to integrate Powerdrive MD Smart variable speed
drive components into an enclosure, as well as its connection and installation. For commissioning and conguring the
drive, refer to commissioning guide ref. 5641.
This guide addresses versions of variable speed drives greater than or equal to V5.80
NOTE

3
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
Throughout the manual, this symbol warns of consequences which may arise from inappropriate use of the
drive, since electrical risks may lead to material or physical damage as well as constituting a re hazard.
(In accordance with the low voltage directive 2014/35/EU)
1 - General information
The integrator is responsible for the selection of the
components for the variable speed drive. All work related to
the installation of the variable speed drive in an enclosure,
such as handling, assembly, installation, cabling and testing
of the nished product, shall be performed by qualied and
authorised personnel. For these basic safety instructions,
qualied personnel shall mean competent persons who
possess the relevant qualications.
The security instructions described in this document shall be
followed carefully
The variable speed drive produced by the integrator must
be tested to ensure its proper functioning, but it must also be
certied to the standards of the place of use.
Depending on their degree of protection, variable speed
drives may contain unprotected live parts, which may be
moving or rotating, as well as hot surfaces, during operation.
Unjustied removal of protection devices, incorrect use,
faulty installation or inappropriate operation could represent a
serious risk to personnel and equipment
For more information, consult the data sheet for each of the
components described in this document.
2 - Use
Variable speed drives are components designed for
integration in electrical installations or machines.
They shall comply with standard EN 60204, which stipulates
in particular that electrical actuators (which include variable
speed drives) cannot be considered as circuit breaking
devices and certainly not as isolating switches.
Commissioning of variable speed drives can take place only
if the requirements of the Electromagnetic Compatibility
Directive (EMC 2014/30/CE) are met.
The integrator shall ensure the variable speed drives meet
the requirements of the Low Voltage Directive 2014/35/CE.
The harmonised standards of the DIN VDE 0160 series in
connection with standard VDE 0660, part 500 and EN 60146/
VDE 0558 are also applicable
The technical characteristics and instructions concerning the
connection conditions shall be specied on the nameplate of
the variable speed drive and in the documentation provided.
3 - Transportation, storage
All instructions concerning transportation, storage and correct
handling must be observed.
The climatic conditions specied in the technical manual must
be observed.
4 - Installation, cabling
The installation and cabling of variable speed drive
components in an enclosure shall meet the specications of
the documentation provided.
The variable speed drive components must be protected
against any excessive stress. In particular, there must be
no damage to parts and/or modication of the clearance
between components during transportation and handling.
Avoid touching the electronic components and contact parts.
The variable speed drive components contain parts which
are sensitive to electrostatic stresses and may be easily
damaged if handled incorrectly. Electrical components must
not be exposed to mechanical damage or destruction (may
result in risks to health!).
5 - Electrical connection
When work is performed on variable speed drives which are
powered up, the national accident prevention regulations
must be observed.
The electrical installation must comply with the relevant
specications (for example conductor cross-sections,
protection via fused circuit-breaker, connection of protective
conductor). More detailed information can be found in the
documentation.
Instructions for an installation which meets the requirements
for electromagnetic compatibility, such as screening, earthing,
presence of lters and correct insertion of cables and
conductors, are given in the documentation supplied with the
variable speed drives. These instructions must be followed
in all cases, even if the variable speed drive carries the CE
mark. Adherence to the limits given in the EMC legislation is
the responsibility of the manufacturer of the installation or the
machine.
6 - Operation
Installations in which variable speed drives are to be
integrated must be tted with additional protection and
monitoring devices as laid down in the current relevant safety
regulations, such as the law on technical equipment, accident
prevention regulations, etc. Modications to variable speed
drives using control software are permitted.
Active parts of the device and the live power connections
must not be touched immediately after the variable speed
drive is powered down as the capacitors may still be charged.
In view of this, warnings must be xed to the affected areas of
the variable speed drive’s enclosure.
Permanent magnet motors generate electrical power if they
are rotated, even when the supply to the drive is disconnected.
In this case, the variable speed drive is powered by the motor
terminals. If the load is capable of running the motor, a cut-off
device upstream of the motor must be provided to isolate the
variable speed drive during maintenance operations.
During operation, all doors and protective covers must be
kept closed.
7 - Servicing and maintenance
Refer to the manufacturer's documentation.
See the Maintenance chapter of this document.
This manual is to be given to the end user.
SAFETY AND OPERATING INSTRUCTIONS FOR VARIABLE SPEED DRIVES

4
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
This manual describes the integration of the various IP00 components (chassis) of the Powerdrive MD Smart in an electrical
enclosure. It also gives details of all its options and extensions which the user may choose to suit their requirements.
The installation of a Powerdrive MD Smart speed variator in a enclosure is carried out by the combination of the different
components offered (rectier frame and inverter, control module, etc.) which allows the realization of multiple solutions in terms of
architecture and cooling of the nal enclosure.
FOREWORD
Powerdrive MD Smart components Options
Power chassis Network side
Motor side
User interface
Control Module Options
Braking
Control
Cable Kits
Sine lter
Sinus lterDV/DT Filter
RFI Filter Line reactor
for AFE
Braking resistor
Preload module
Parallelisation module
Braking transistor
Three-phase, single
or dual rectier
chassis
Three-phase inverter
chassis
Primary Control Module
LITE

5
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
Thanks to its modular structure, the components of the Powerdrive MD Smart make it possible to assemble all kinds of architecture:
6,12,18, or 24 Pulse, Active Front-End (AFE), DC Bus systems, DC/DC converters).
Multiple cooling choices
Power components on chassis are available in 2 variants to provide maximum cooling exibility:
- air cooling with integrated ventilation
- cold plate cooling for external liquid cooling
POWERDRIVE MD Smart: MULTIPLE ARCHITECTURES
Chassis with internal ventilation Cold plate chassis
Liquid cooling
6 Pulse Version
(standard variable speed drive)
1 single rectier
BOXES:
THDI>40%
THDI=5% with active lter option
18 Pulse Version
3 single rectiers
BOXES:
THDI=8%
Active Front End
BOXES:
THDI=3%
Passive DC Bus System AFE DC Bus System
(Active Front End) DC/DC Converter
DC In
DC Out
12 Pulse Version
2 single rectiers
BOXES:
THDI=12%
24-pulse version
4 single rectiers
BOXES:
THDI=5%

6
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
STRUCTURE OF THE MANUAL
1 - GENERAL INFORMATION
2 - HARDWARE SELECTION
3 - MECHANICAL INSTALLATION
4 - CONNECTIONS - CABLING
5 - TEST
6 - MAINTENANCE
7 - UL
8 - APPENDICES

7
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
SUMMARY
1 - GENERAL INFORMATION ................................................................................................................................ 10
1.1 - Working principle of a variable speed drive................................................................................................ 10
1.2 - Key components of the Powerdrive MD Smart........................................................................................... 11
1.2.1 - Filtering elements.................................................................................................................................................11
1.2.2 - Rectiers ............................................................................................................................................................. 12
1.2.2.1 - Passive rectiers ..................................................................................................................................... 12
1.2.2.2 - Active rectiers........................................................................................................................................ 14
1.2.3 - Preload module ................................................................................................................................................... 16
1.2.4 - Inverters .............................................................................................................................................................. 16
1.2.5 - Parallelisation module ......................................................................................................................................... 17
1.2.6 - The braking module............................................................................................................................................. 17
1.2.7 - The control module.............................................................................................................................................. 18
1.2.7.1 - General information................................................................................................................................. 18
1.2.7.2 - Systemiz ................................................................................................................................................. 20
1.2.8 - Cable kit .............................................................................................................................................................. 20
1.3 - Associating components according to architecture.................................................................................... 21
1.4 - Cooling methods........................................................................................................................................ 25
1.4.1 - Air cooling............................................................................................................................................................ 25
1.4.1.1 - Ventilated power components ................................................................................................................. 25
1.4.2 - Liquid cooling (CL version) .................................................................................................................................. 26
1.4.3 - Internal loss management ................................................................................................................................... 27
2 - HARDWARE SELECTION ................................................................................................................................. 28
2.1 - General characteristics.............................................................................................................................. 28
2.2 - Determination of the continuous output current (Isp).................................................................................. 28
2.2.1 - Aid for determining Isp variator current under non-standard conditions............................................................... 29
2.2.2 - Setting the design temperature............................................................................................................................ 30
2.2.3 - Determination of the Isp continuous output current.............................................................................................. 32
2.2.4 - Low frequency (Lf) correction factor .................................................................................................................... 33
2.2.5 - Choosing the chopping frequency ....................................................................................................................... 33
2.3 - Hardware selection ................................................................................................................................... 34
2.3.1 - 6-PULSE Variable speed drive ........................................................................................................................... 34
2.3.1.1 - Composition ............................................................................................................................................ 34
2.3.1.2 - Example of component selection............................................................................................................. 35
2.3.1.3 - 6-PULSE variable speed drive, 400V -10% to 480V +10%...................................................................... 36
2.3.1.4 - 6-PULSE variable speed drive, 525V -10% to 690V +10%...................................................................... 38
2.3.1.5 - Composition ............................................................................................................................................ 40
2.3.1.6 - Example of component selection............................................................................................................. 41
2.3.1.7 - AFE variable speed drive, 400V -10% to 480V +10%.............................................................................. 42
2.3.1.8 - AFE variable speed drive, 525V -10% at 690V +10%.............................................................................. 44
2.4 - Standards .................................................................................................................................................. 46
2.5 - Environmental specications ..................................................................................................................... 46
2.5.1 - Environmental specications during transportation and storage ......................................................................... 46
2.5.2 - Environmental conditions during operation.......................................................................................................... 46
2.6 - Resistance to acids and corrosive gases ................................................................................................... 46
2.7 - Electrical characteristics of components.................................................................................................... 46
2.7.1 - Passive rectier chassis ..................................................................................................................................... 46
2.7.1.1 - Cables and fuses .................................................................................................................................... 47
2.7.1.2 - UR fuse, line reactor and RFI lter options .............................................................................................. 50
2.7.2 - MD3INV Active rectier chassis .......................................................................................................................... 52
2.7.2.1 - Cables and fuses .................................................................................................................................... 53
2.7.2.2 - Filtering options....................................................................................................................................... 56
2.7.3 - Preload module MD3PRG................................................................................................................................... 59
2.7.4 - Inverter chassis MD3INV .................................................................................................................................... 60
2.7.5 - Fan modules........................................................................................................................................................ 63
2.7.6 - MD3TF Braking modules and resistors................................................................................................................ 64
2.7.6.1 - Braking transistor .................................................................................................................................... 64
2.7.6.2 - Braking resistor ....................................................................................................................................... 65
2.7.7 - Control module MD3CTL..................................................................................................................................... 65
2.7.8 - Parallelisation module MD3PRL.......................................................................................................................... 70
2.7.9 - Customisation card ............................................................................................................................................. 72

8
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
SUMMARY
3 - MECHANICAL INSTALLATION ......................................................................................................................... 73
3.1 - Checks upon receipt ................................................................................................................................. 73
3.2 - Handling .................................................................................................................................................... 73
3.3 - Dimensions and weights............................................................................................................................ 74
3.3.1 - Single rectier chassis MD3REC1....................................................................................................................... 74
3.3.2 - Preload module MD3PRG................................................................................................................................... 76
3.3.3 - Inverter chassis (motor and network) MD3INV size1........................................................................................... 77
3.3.4 - Braking module MD3TF....................................................................................................................................... 86
3.3.5 - Control module MD3CTL and parallelisation module MD3PRL ........................................................................... 87
3.3.6 - HMI and console ................................................................................................................................................. 88
3.3.6.1 - MD3SUI .................................................................................................................................................. 88
3.3.6.2 - MD3KEYPAD .......................................................................................................................................... 88
3.4 - Installation ................................................................................................................................................. 89
3.4.1 - General information............................................................................................................................................. 89
3.4.1.1 - AF chassis installation............................................................................................................................. 89
3.4.1.2 - Installation in enclosure:.......................................................................................................................... 90
3.4.1.3 - CL chassis installation ............................................................................................................................. 93
3.4.1.4 - Installation in enclosure .......................................................................................................................... 93
3.4.2 - Minimum installation distances............................................................................................................................ 94
3.4.2.1 - Rectier chassis MD3REC1 .................................................................................................................... 94
3.4.2.2 - Inverter chassis MD3INV......................................................................................................................... 96
3.4.2.3 - Preload module MD3PRG....................................................................................................................... 99
3.4.2.4 - Control module MD3CTL and parallelisation module MD3PRL ............................................................. 100
3.4.3 - Air ow management......................................................................................................................................... 102
3.5 - Liquid cooling management ..................................................................................................................... 103
3.5.1 - Flow rate............................................................................................................................................................ 103
3.5.2 - Recommendations ............................................................................................................................................ 104
3.5.3 - Drainage and maintenance ............................................................................................................................... 104
3.6 - Variable speed drive losses ..................................................................................................................... 105
3.7 - Ventilation ow rates................................................................................................................................ 108
3.8 - Noise levels ............................................................................................................................................. 110
4 - CONNECTIONS - CABLING ........................................................................................................................... 112
4.1 - Power network......................................................................................................................................... 112
4.1.1 - Neutral IT point connection.................................................................................................................................112
4.1.2 - Ground connections ...........................................................................................................................................113
4.1.2.1 - Equipotential protection or EP circuit......................................................................................................113
4.1.2.2 - Shielding ................................................................................................................................................114
4.1.2.3 - Cable routing..........................................................................................................................................115
4.2 - Electromagnetic Compatibility (EMC) ...................................................................................................... 116
4.3 - Special cabling......................................................................................................................................... 117
4.4 - Electrical diagrams .................................................................................................................................. 118
4.4.1 - 6-PULSE version ≤ 500 kW ................................................................................................................................118
4.4.2 - 6-PULSE version up to 2,500 kW .......................................................................................................................119
4.5 - AFE electrical diagrams........................................................................................................................... 121
4.5.1 - AFE Version <500 kW ....................................................................................................................................... 121
4.5.2 - AFE Version > 500 kW....................................................................................................................................... 122
4.6 - 12, 18, 24-PULSE electrical diagrams ..................................................................................................... 124
4.7 - Location of terminal blocks....................................................................................................................... 125
4.7.1 - Control module MD3CTL................................................................................................................................... 125
4.7.2 - Parallelisation module MD3PRL........................................................................................................................ 126
4.7.3 - Rectier chassis MD3REC and preload module MD3PRG................................................................................ 127
4.7.4 - Rectier chassis MD3INV.................................................................................................................................. 128
4.7.5 - HMI AND CONSOLE......................................................................................................................................... 130
4.7.5.1 - MD3SUI ................................................................................................................................................ 130
4.7.5.2 - MD3KEYPAD ........................................................................................................................................ 130
4.8 - Strands between terminal blocks ............................................................................................................. 131
4.9 - Brake module cabling .............................................................................................................................. 145

9
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
SUMMARY
4.10 - DC Bus cabling ...................................................................................................................................... 146
4.10.1 - Cabling connections ....................................................................................................................................... 147
4.11 - Control terminal cabling ......................................................................................................................... 148
4.11.1 - Remote control ................................................................................................................................................ 148
4.11.2 - Changing the Start/Stop command logic.......................................................................................................... 149
4.11.3 - Systemiz wizard details (pre-set internal settings) ........................................................................................... 149
4.11.4 - STO-1 / STO-2 inputs: safe torque off function................................................................................................. 151
4.11.4.1 - Single channel lockout (SIL1 - PLb)..................................................................................................... 152
4.11.4.2 - Dual channel lockout (SIL3 - Ple)......................................................................................................... 152
5 - TESTING ......................................................................................................................................................... 153
5.1 - Self-testing and diagnostics .................................................................................................................... 153
5.1.1 - Control module MD3CTL................................................................................................................................... 153
5.1.2 - Power................................................................................................................................................................ 153
5.2 - Operating test .......................................................................................................................................... 154
5.2.1 - Necessary hardware: ........................................................................................................................................ 154
5.2.2 - Test preparation................................................................................................................................................. 155
5.2.3 - Functional Testing ............................................................................................................................................. 155
6 - MAINTENANCE ............................................................................................................................................... 157
7 - UL LISTING INFORMATION ............................................................................................................................ 157
7.1 - UL le reference....................................................................................................................................... 157
7.2 - Mounting.................................................................................................................................................. 157
7.3 - Environment ............................................................................................................................................ 157
7.4 - Maximum continuous current................................................................................................................... 157
7.5 - Electrical installation ................................................................................................................................ 157
7.5.1 - Terminal torque.................................................................................................................................................. 157
7.5.2 - Cabling terminals............................................................................................................................................... 157
7.5.3 - Branch circuit protection.................................................................................................................................... 157
7.5.4 - Line reactors...................................................................................................................................................... 159
7.6 - AC supply specication............................................................................................................................ 159
7.7 - Motor overload protection and overspeed protection ............................................................................... 159
7.8 - PX1, PX2, PX3 and P2 customer interface .............................................................................................. 159
8 - APPENDICES .................................................................................................................................................. 160

10
GENERAL INFORMATION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
GENERAL
INFORMATION
1 - GENERAL INFORMATION
1.1 - Working principle of a variable speed drive
An electronic variable speed drive allows an electric motor to be supplied with a variable voltage and frequency by drawing energy
from a xed voltage and frequency electrical network.
Schematic diagram of a variable speed drive:
A variable speed drive essentially consists of:
• A ltering element to limit harmonic pollution.
- DC Bus reactor or line reactor
• A Passif or Active rectier:
- Passive: connected to a three-phase power supply (the network), it generates continuous voltage. This rectier is composed of 3
thyristors and 3 diodes (combined bridge rectier).
- Active: connected to a three-phase power supply (the network), it generates continuous voltage. This rectier is composed of
IGBTs which are driven according to the PWM (Pulse Width Modulation) principle and capacitors which act mainly by "smoothing"
the voltage of the DC Bus.
• An inverter that generates the power signal at varying voltages and/or frequencies. This inverter is composed of a DC Bus acting
mainly on “smoothing” the output voltage of the rectier via capacitors and IGBT which are controlled according to the principle of
Pulse Width Modulation (PWM).
• Control electronics, i.e. a control module which controls (transmission and reception of signals) the rectier and the inverter.
The power components of the Powerdrive MD Smart variable power drive are available up to 500 kW. Beyond that, the rectier
and inverter chassis shall be parallelised to achieve the required power levels (> 2.5 MW).
(*) 3 solutions are possible:
• a network ltering:
- line reactor
- low harmonic active lter
• ltering on the DC Bus circuit:
-continuous reactor

11
GENERAL INFORMATION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
GENERAL
INFORMATION
1.2 - Key components of the Powerdrive MD Smart
1.2.1 - Filtering elements
Each industrial power supply network has its own intrinsic characteristics (short-circuit capacity, value and voltage
uctuation, phase imbalance, etc.) and supplies equipment, some of which can distort its voltage permanently or
temporarily (notches, voltage dips, surge, etc.). Disruptions to the power grid can be caused by the following factors:
• Power factor correction equipment connected near the variable speed drive.
• High power DC variable speed drives that do not have line reactors (or when they are inadequate) connected to the power supply.
• Motor(s) started live and connected to the power supply. When one of these motors is started, the voltage drop exceeds 20%.
Such disturbances cause an overcurrent in the input power supply circuit of the drive which can lead to unwanted tripping of the
drive, or in extreme cases to the failure of certain components. The quality of the power supply network therefore has an impact
on the performance and reliability of electronic equipment, particularly variable speed drives.
Inductors protect the drive from these different disturbances:
• AC reactor
Nidec Leroy-Somer has made the technological choice to install an AC input reactor upstream of the rectier in order to limit
the disturbances described above. The recommended inductances are outlined in §2.5.1.2. They comply with EN 50178,
EN/IEC 61558-2-20, EN/IEC 60076-6.
However, depending on the type of power supply network, Leroy-Somer authorises the use of other lters, see below.
• DC reactor
Consult Nidec Leroy-Somer
• Without line reactor
On a 12, 18 or 24 PULSE architecture (explanation of the different architectures in §1.3), where the drive has a dedicated
power supply, i.e. it is the only one present downstream of the transformer supplying it, the inductance of the transformer is
high enough not to add a line reactor. It will therefore be possible to do without this reactor under certain conditions, see tables
below.
• 12 PULSE
Transformer power Transformer short circuit voltage Rectier input current
500 kVA 6% 595 A - 340 T
630 kVA 6% 719 A - 430 T
800 kVA 6% 833 A - 470 T
800 kVA 6% 896 A - 570 T
1000 kVA 6% 1145 A - 680 T
1250 kVA 6% 1290 A - 860 T
1250 kVA 6% 1540 A - 940 T
1600 kVA 6% 1719 A - 1140 T
• 18 PULSE
• 24 PULSE

12
GENERAL INFORMATION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
GENERAL
INFORMATION
1.2.2 - Rectiers
POWERDRIVE MD Smart rectiers are elements offered on an IP00 chassis. They generate a DC voltage from the voltage of the
three-phase AC power supply network that supplies them. They are AC/DC converters.
The offer includes 2 types of rectiers:
- Passive rectier: used with basic power supplies (three-phase network), operating in 2 quadrants.
- Active rectier: used with installations requiring the reinjection of current into the network in the case of driving loads or energy
generation (operation in 4 quadrants) or to limit the harmonic rate to a low level (THDI ≤ 3%).
Rectiers can be used as stand-alone devices to generate a common DC bus for several drives with reduced capacity. This is
called a common DC Bus system. This solution is widely used in multi-axis applications such as cranes and travelling gantries or in
industrial production lines. In fact, this makes it possible to facilitate energy exchanges between the various axes, thus generating
energy savings.
1.2.2.1 - Passive rectiers
The passive rectiers of the Powerdrive MD Smart designated MD3REC operate in 2 quadrants, that is, the energy can only ow
from the network power supply to the DC Bus (capacitors). In the case of driving loads or load decelerations that are too fast, the
energy produced cannot be discharged, DC Bus overvoltage phenomena may occur. To avoid any risk of unwanted tripping, this
energy must be dissipated in resistors via a braking module (see chapter §1.2.6).
Note
The rectier bridge is composed of switching electronics (thyristors and diode) responsible for the production of harmonics.
These elements are not linear elements, the current conduction only takes place for a short time, at each sine wave peak to
recharge the DC Bus (capacitors).
These harmonics can cause the overheating of transformers, cables, motors, generators and capacitors connected to the same
power supply. If the network is too polluted, the lights and displays of the electronic devices start to icker, circuit breakers may trip,
computers malfunction and measuring instruments give erroneous values.
The amplitude of the harmonics is linked to the impedance of the network upstream of the rectier bridge, and to the structure of the
DC Bus downstream of the rectier bridge The more inductive the mains supply and the motor are, the more these harmonics are
reduced. They only have an impact on the quality of the network for capacities installed in frequency converters of a few hundred
kVA or in the case where these same capacities are greater than a quarter of the total power installed on a site.
Test Clause
IEC 18000-5-1 Referenced standard
Electrostatic discharge immunity 5.3.3 IEC61000-4-2
Radio frequency eld immunity 5.3.3 IEC61000-4-3
Fast transient burst immunity to power terminals
and control terminals
5.3.3 IEC61000-4-5
Common mode radio frequency immunity to
power terminals and control terminals
5.3.3 IEC61000-4-6
Generic immunity standards for the industrial
environment
5.3.3 IEC61000-6-2
Note
A THD harmonic distortion rate of 30% is equivalent to 5% less RMS current on the line.

13
GENERAL INFORMATION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
GENERAL
INFORMATION
Different drive congurations make it possible to respond to this problem of reinjection of harmonics into the network. Indeed,
depending on the choice of the drive architecture and/or adding lters (active or passive), the level of harmonics is reduced. The
choice of conguration is related to the required harmonic distortion rate (THD, rate expressed in percentage). The higher the rate,
the more the power supply network can be disrupted.
Current THD (%) Drive congurations Estimated current waveforms
30
6 PULSE
1 passive rectier only: this is the conguration of a
commonly used standard variable speed drive
12
12 PULSE
2 passive rectiers:
the rectiers are powered by a 3-winding transformer
or by 2 transformers with 2 windings. The secondary
transformers are out of phase by 30° in both cases.
8
18 PULSE
3 passive rectiers: the secondary transformers are
20° out of phase.
5
24 PULSE
4 passive rectiers: the secondary transformers are
15° out of phase.
5
6 PULSE + ACTIVE LOW HARMONIC FILTER
1 passive rectier only: corresponds to the
conguration of a commonly used standard variable
speed drive + 1 ACTIVE HARMONIC LOW FILTER

14
GENERAL INFORMATION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
GENERAL
INFORMATION
The Nidec Leroy-Somer offer consists of:
Single rectifier chassis
The MD3REC1 single rectier chassis is a mixed three-phase bridge assembly: 3 thyristors and
3 switching diodes. The 3 thyristors are only used to preload the DC BUS at start-up. After this
phase, the rectier is used as a full voltage diode bridge. Each thyristor or diode connects one
of the 3 phases to one of the 2 terminals of the DC bus. The rectier also incorporates a control
card to control the thyristors and make them a standalone DC power supply.
1.2.2.2 - Active rectiers
An active rectier allows the energy produced by driving machines or during rapid decelerations to be injected back into the network
(4 quadrants of the torque speed plane). They also limit the harmonic content to very low levels (THDI ≤3%).
This rectier has an identical structure to an IGBT (Insulated Gate Bipolar Transistor) inverter, which is controlled by the MLI Pulse
Width Modulation method. It must be associated with a control module. In rectier mode, it generates a regulated and adjustable
continuous voltage from the network power voltage.
In order to minimise the disturbance generated by the IGBT control and to guarantee a virtually sinusoidal input current (THDI)
<5%), a ltering system must be installed upstream of the rectier.
Reminder: radio frequency (RFI) signal transmission
Variable speed drive inverters switch high voltages (> 550 V) at high frequencies (several kHz).
As a result, they generate radio frequency (R.F.) signals that can disrupt the operation of other devices:
• due to the high-frequency leakage currents that "leak" to the earth by the leakage capacity of the variator/motor cable and that of
the motor through the metal structures supporting the motor.
• via conduction or re-injection of R.F. signals on the power cable: conducted emissions
• by direct radiation in the vicinity of the power supply or variator/motor cable: radiated emissions.
The inverters are adapted to the EMC environments described in IEC/EN 61800-3 category C3. It is possible to add an optional
additional lter in the case of a more severe EMC environment.
The main advantages of such a reversible system are:
- possible return of energy to the power grid
- the input current waveform is slightly distorted, almost sinusoidal
- the power factor upstream of the converter is very close to 1
- the output voltage for the motor may be higher than that available on the AC power network. Because the voltage of the DC Bus
is regulated at a higher value than that of a passive rectier, it is possible to obtain a motor voltage of 480 V. In some cases, if the
motor allows it, this function allows a lower motor current to be obtained and consequently the design of the output inverter to be
optimised.
Power network
AC
Single passive rectier
MD3REC1

15
GENERAL INFORMATION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
GENERAL
INFORMATION
Absorbed line current, MDR
THDI (*) <5%
The active rectier is incorporated into an MD3INV inverter chassis.
Since the DC output of an active rectier consists of a high value of capacitors, it is imperative, when powering on, to gradually
raise the voltage of the DC bus before unlocking the rectier. This preload operation is possible with the MD3PRG module (for
details, see §1.2.3).
For normal conditions of use, the active rectier shall incorporate:
- Filtering: an RFI lter, a Regen reactor and a LC sine lter,
- an MD3INV inverter,
- an MD3PRG preload module.
Filtering
MD3PRG
Rectier
MD3INV

16
GENERAL INFORMATION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
GENERAL
INFORMATION
MD3INV chassis are available in 3 sizes depending on the desired power level.
MD3INV
Size 1
Size 2
Size 3
Up to 200 kW
single module chassis 250 kW to 315 kW
tri-module chassis 400 kW to 500 kW
tri-module chassis
Beyond 500 kW, the MD3INV chassis can be combined in parallel up to 5 per output, allowing a power output of 2.5 MW. In this
case, it is necessary to add a parallelisation module. For more details, refer to §1.2.5.
1.2.3 - Preload module
The MD3PRG preload module allows the DC bus to be powered up gradually from an active rectier
system or from a DC bus system. It allows, through controlled thyristors, the voltage of the DC BUS
to be increased gradually.
From a certain VDC voltage threshold, information is sent to the control module which also checks
that the network is in phase. When all these conditions are met, the active rectier can be unlocked
and connected to the power circuit, the preload module can be isolated.
1.2.4 - Inverters
MD3INV inverters convert the DC Bus voltage provided by the rectier
to generate a three-phase source with variable voltage and frequency
to power the motor.
This inverter has an IGBT structure and works according to the Pulse
Width Modulation (PWM) method. It must be associated with a control
module and generate AC voltage from the DC bus voltage (DC/AC
converter).
Note
MD3INV modules can also be used as active rectiers. For more
information, see §1.2.2.2
Inverter
MD3INV

17
GENERAL INFORMATION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
GENERAL
INFORMATION
1.2.5 - Parallelisation module
Above 500 kW, the rectier and inverter chassis shall be installed in parallel to achieve the required
power levels (up to 2.5 MW). In this conguration, the rst inverter (or active rectier) chassis must be
associated with a control module and each additional chassis must be associated with an MD3PRL
parallelisation module.
1.2.6 - The braking module
In the case of driving loads with high inertia or load decelerations that are too fast, the energy produced
cannot be evacuated, DC Bus overvoltage phenomena may occur. To avoid any risk of unwanted
tripping, this energy must be dissipated in resistors via a braking module.
The MD3TF braking module is compatible with 6-PULSE, 12-PULSE, 18-PULSE and 24-PULSE
power architectures.
Note
The braking module can also be combined with an Active Front End (AFE) architecture, with an
active rectier, although the system is regenerative. In fact, for very specic applications such as
hydroelectricity, it is possible to consider a cut in the supply network and thus the impossibility of
reinjecting energy on the network, when tripping. During the shutdown phase, this energy must be
dissipated through a braking transistor in a braking resistor. This option can also be integrated into test
bench-type applications on synchronous machines.
Examples of applications where the braking module is most often used: Ventilation, Press, Lifting, 2 x
Cn Braking (Cn = Motor rated torque), Hydroelectricity, Synchronous machine test bench.
Several braking modules can be combined to increase the braking capacity. They must not
be mounted in parallel on a single resistor: use as many resistors as braking modules.

18
GENERAL INFORMATION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
GENERAL
INFORMATION
1.2.7 - The control module
1.2.7.1 - General information
The MD3CTL control module is used to coordinate and control all system components (rectier,
preload, inverters, etc.). Equipped with a large number of logic or analogue inputs/outputs and
different communication ports, it can be interfaced with all command and control systems, as shown
in the diagram below.
Note
For more information on the various optional modules, please refer to the manuals of the relevant modules (www.leroy-somer.com).
• MDX Canopen ref: 5182
• MDX Ethernet ref: 4579
• MDX Ethernet IP ref: 4933
• MDX Modbus ref: 4580
• MDX Probus ref: 4578
• MDX Pronet ref: 5503
• MDX Encoder Resolver ref: 5340
• MDX-IO LITE ref: 5215
• MDX-IO-M2M ref: 5146

19
GENERAL INFORMATION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
GENERAL
INFORMATION
Combination of options
Details
Control
module
Options which can be mounted on Control Module
(1)
MDX I/O
Lite
MDX I/O
M2M
MDX
Encoder
MDX
Resolver
Modules
MDX/CM
Analogue input (V, mA)
2
-
1
Differential analogue input (V)
1
1
1
Analogue outputs (V, mA)
1
2
1
Logic inputs
5
2
4
Logic outputs
1
1
2
Output relay
2
1
2
USB
1
(2)
-
1
(3)
Cableless
1
-
-
Real time clock
1
-
1
(4)
Data recorder
-
-
1
Non-isolated RS485
RTU
MODBUS
-
Isolated RS485
-
-
MODBUS
MODBUS
TCP Modbus
-
-
-
ETHERNET
Ethernet/ IP
-
-
1
ETHERNET-IP
Probus DP V1
-
-
-
PROFIBUS
Pronet
-
-
-
PROFINET
Canopen
-
-
-
CANOPEN
5 V or 15 V incremental encoder input
-
-
-
1
Resolver input
-
-
-
-
1
(1) The MDX I/O Lite option cannot be combined with the MDX I/O M2M, MDX Encoder and MDX Resolver options. MDX Encoder
and MDX Resolver options cannot be combined
(2) For control module setup or rmware update by PC
(3) To upgrade the rmware or download the saved data
(4) Uses the control module clock to time stamp records

20
GENERAL INFORMATION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
GENERAL
INFORMATION
1.2.7.2 - Systemiz
Systemiz is a unique application that offers a multitude of services to support our ranges of motors and variable speed drives.
The Systemiz application offers 3 features:
For more informations, visit
leroy-somer.fr
Downloads Brochures
VARIABLE
SPEED
CONTROL
POWERDRIVE MD Smart & SYSTEMIZ
REF. 5688
Document library
This feature provides access to all product documentation or related services. Product
identication is obtained by scanning the QR code or by entering the numerical code available on
the nameplate.
Powerdrive MD Smart setup interface
Enables simplied, intuitive and interactive setup of the Powerdrive MD Smart.
- Motor parameter information is automatically generated by scanning the QR code or by entering
the numerical identication code on the motor’s nameplate.
- The operator interface becomes fully congurable as per the client’s wish or application.
- Innovative diagnostic tools.
Motor data
This feature allows you to obtain the motor parameters to be set in a variable speed drive other
than the Powerdrive MD Smart from the QR code or the numerical identication code on the
motor’s nameplate.
The Systemiz application is available on:
• Smartphone or tablet via secure cableless connection. In this version, the app is available for download on Google Play platforms
(Android version).
• Cabled PC connected to USB port of variable speed drive control module. The Systemiz application can be downloaded from the
Leroy-Somer website.
• By HMI installed locally on the enclosure’s facade for example. This HMI, available as an option, comes with the application
loaded and ready to use (please note that it is only compatible with the Powerdrive MD Smart, and should not be
connected to other hardware).
1.2.8 - Cable kit
the KITCxxyy cable kit consists of different cables that provide an electrical connection between the different
components of the Powerdrive MD Smart.
There are different cable kits according to their length (xx = 12 or 20, for 1.2 m or 2 m), and their composition
(yy = INV for inverter, REC for rectier). See §4.9.