Nord Drivesystems SK 750E-751-323-A User manual

MANUAL
NORDAC SK 750E
Frequency Inverter
SK 750E-551-323-A (-W) ... SK 750E-112-323-A (-W)
(5.5kW … 11kW, 3~ 230V)
SK 750E-551-340-A (-W) ... SK 750E-222-340-A (-W)
(5.5kW … 22kW, 3~ 400V)
BU 0750 GB
Для заказов : [phone] Email: [email protected]
8-800-511-65-88 (Бесплатно по РФ)

NORDAC SK 750E Handbuch Safety instructions
2 BU 0750 GB
NORDAC SK 750E Frequency Inverter
Instructions for the safety and use of
variable frequency inverters
(as provided in the 73/23/EEC low-voltage directive)
1. General
Depending on their type of enclosure, variable frequency invert-
ers may have live, bare, in some cases even moving or rotating
parts as well as hot surfaces during operation.
Inadmissibly removing the required covers, improper use, incor-
rect installation or handling can be dangerous and may lead to
serious damage to persons or to property.
See the documantation for more detailed information.
Any transport, installation, starting-up or maintenance work shall
be performed by properly qualified, skilled and competent per-
sonnel (IEC 364 or CENELEC HD 384 respectively or DIN VDE
0100 and IEC 664 or DIN VDE 0110 and national accident pre-
vention regulations to be observed).
Qualified, skilled personnel as mentioned in these basic safety
instructions is understood to refer to persons who are familiar
with the installation, assembly, setting-up and operation of the
product and who have the qualifications required for the job of
which they are in charge.
2. Intended use
Variable frequency inverters are components designed to be in-
tegrated into electrical installations or machinery.
If the inverters are installed in machines, they must not be put
into operation (in other words, operation as intended by the
manufacturer must not begin) until it has been established that
the machine in question actually meets the requirements men-
tioned in the EG directive 89/392/EEC (Directive For Machines);
EN 60204 is to be observed.
The device must not be put into operation (i.e. operation as in-
tended by the manufacturer must not be started) unless the
stipulations of the EMC directive (89/336/EEC) are fulfilled.
Variable drequency inverters meet the requirements stated in the
low-voltage directive 73/23/EEC. Likewise the accorded stan-
dards of the series prEN 50178/DIN VDE 0160 in conjunction
with EN 60439-1/ VDE 0660 Part 500 and EN 60146/ VDE 0558
are applied to the variable frequency inverters.
Refer to the rating plate and the documentation for details on
technical data and connecting requirements and do not fail to
observe them and to follow instructions.
3. Transport, storage
Follow the instructions for transport, storage, and proper han-
dling. Ensure climatic conditions as specified in prEN 50178.
4. Installation
The devices must be installed and cooled as directed in the rele-
vant documentation.
The variable frequency inverters must be protected against in-
admissible stress. It is of particular importance that no compo-
nents are bent and/or insulation distances changed during trans-
port and handling. Do not touch electronic components and con-
tacts.
Variable frequency inverters contain electrostatically sensitive
components which are easily damaged through improper han-
dling. Electrical components must not be damaged or destroyed
mechanically (potential health risks!).
5. Electrical connection
Follow the applicable national accident prevention rules (e.g.
VGB 4) when working on variable frequency inverters while they
are live.
Electrical installation is to be performed in accordance with ap-
plicable rules and regulations (e.g. regarding conductor cross
sections, fusing, PE connection). Apart from these, more instruc-
tions may be mentioned in the documentation.
Recommendations for meeting EMC standards in installation –
for instance with regard to screening, earthing, filter arrangement
and the routing of lines –are found in the inverter documenta-
tion. CE-marked variable frequency inverters are always sub-
jects to such instructions as well. It is the responsibility of the
machine or plant manufacturer to ensure that the limit values
stipulated by the EMC legislation are duly met.
6. Operation
It may be necessary to provide facilities in which variable fre-
quency inverters are installed with additional monitoring and pro-
tecting devices to satisfy the applicable safety regulations, e.g.
the law on technical work materials, accident prevention regula-
tions etc. Modifications of the variable frequency inverters by
means of the operating software are allowed.
Do not touch live parts of the device or power terminals right af-
ter the inverter has been disconnected from the supply voltage
as capacitors may still be charged. The information plates on the
variable frequency inverters will give you precise details on the
subject.
Keep all covers closed during operation.
7. Service and maintenance
As described in the manufacturer's documentation.
Do keep these Safety Instructions for future reference!

NORDAC SK 750E Manual Regarding the present document
BU 0750 GB 3
Documentation
Designation/Name/Title: BU 0750 GB
Part no.: 607 75 02
Device series: SK 750E
List of versions/updates
Titles of previous editions
Last up-
date s.w.
Remarks
BU 0750 GB, December 2004
V 3.1 R1
First edition, based on BU 0700 GB
BU 0750 GB, December 2005
V 3.1 R2
Revision, completion and correction
BU 0750 GB, April 2006
V 3.2 R0
Revision, wall mounting kit, motor mounting, differen-
tiation of the options for IP54 and IP65 design, cable
clamp screws
BU 0750 GB, March 2007
Mat. no.: 6077501 / 1207
V 3.2 R0
Data storage via P550 only using the right slot, Sec-
tion 3.2 Right / left slot
BU 0750 GB, March 2008
Mat. no.: 6077502 / 1208
V3.4 R4
Electro magnetic motor brake control connection,
P217, P426, P533, P535
Editor
Getriebebau NORD GmbH & Co. KG
Rudolf- Diesel- Str. 1 D-22941 Bargteheide http://www.nord.com/
Phone [phone] / 401-0 Fax [phone] / 401-555
Use of the frequency inverters as intended by the manufacturer
For operation to proceed without trouble and for possible warranty claims to be satisfied, fol-
lowing the Operating Instructions is indispensable. So please read the Operating Instructions
first before starting to work with the device!
The Operating Instructions contain important information regarding the service. That is why
they should be kept near where the device is being used.
SK 750E frequency inverters are designed for industrial plant to operate three-phase asynchro-
nous motors with squirrel-cage rotors. These motors must be suitable to be controlled by fre-
quency inverters. The frequency inverters do not allow for any other loads to be connected.
SK 750E frequency inverters are devices designed for stationary installation. All of the informa-
tion provided with regard to the technical data and the conditions admissible at the site where
they are used must be strictly adhered to without exception.
The devices must not be put into operation (i.e. operation as intended by the manufacturer must
not be started) until it has been established that the machine in question actually meets the re-
quirements mentioned in the EMC directive 89/336/EEC and until conformity of the final product
with the directive 89/392/EEC for machines has been verified (EN 60204 to be observed).
Getriebebau NORD GmbH & Co. KG, 2008

NORDAC SK 750E Handbuch
4 BU 0750 GB
1 GENERAL .....................................................................................................................................6
1.1 Essentials .................................................................................................................6
1.2 Delivery.....................................................................................................................6
1.3 Scope of delivery ......................................................................................................7
1.4 Safety and installation instructions ...........................................................................8
1.5 Licenses and approvals ............................................................................................9
1.5.1 UL and cUL approvals ......................................................................................9
1.5.2 European EMC directive...................................................................................9
1.6 Nomenclature / Type code .....................................................................................10
1.7 Types of protection IP54 /IP65 ...............................................................................11
2 MOUNTING AND INSTALLATION............................................................................................ 12
2.1 On the motor and close to the motor ......................................................................12
2.2 Mounting .................................................................................................................13
2.3 SK 750E dimensions ..............................................................................................14
2.4 Accessories for attachment of the SK 750E ...........................................................15
2.5 SK 750E wall-mounting kit......................................................................................15
2.5.1 Dimensions of the SK 750E with wall mounting kit ........................................16
2.6 Mounting the SK 750E directly on the motor ..........................................................17
2.7 Wiring instructions ..................................................................................................18
2.8 Electrical connection...............................................................................................19
2.9 Electrical connection of the power section .............................................................19
2.9.1 Mains connection (PE, L1, L2, L3) .................................................................21
2.9.2 Electromagnetic brake (+Br, -Br, PE) .............................................................21
2.9.3 Braking resistor connection (+B, -B, PE)........................................................21
2.9.4 Motor cable (U, V, W, PE) ..............................................................................21
2.9.5 Temperature sensor (T1, T2) .........................................................................22
2.9.6 Power supply terminals ..................................................................................22
2.9.7 Control terminals (optional) ............................................................................23
2.9.8 Cable clamp screws .......................................................................................24
3 OPTIONAL EQUIPMENT........................................................................................................... 25
3.1 Modular subassemblies ..........................................................................................25
3.2 Overview of the Technology Units..........................................................................26
3.2.1 Assembly of the Technology Units .................................................................28
3.2.2 ControlBox ......................................................................................................29
3.2.3 PotentiometerBox ...........................................................................................34
3.2.4 DeviceNet module ..........................................................................................34
3.2.5 Profibus module..............................................................................................35
3.2.6 CANopen bus module ....................................................................................35
3.2.7 InterBus module .............................................................................................36
3.2.8 AS Interface....................................................................................................36
3.2.9 Upgrading kit, SK TU2 cover..........................................................................37
3.3 Overview of the customer interfaces ......................................................................38
3.3.1 How to assemble the custom interfaces.........................................................39
3.3.2 How to detach the custom interfaces .............................................................40
3.3.3 Basic I/O custom interface..............................................................................41
3.3.4 Standard I/O custom interface........................................................................42
3.3.5 Multi I/O custom interface...............................................................................43
3.3.6 Multi I/O 20mA custom interface ....................................................................44
3.3.7 Bus-type customer interfaces, SK CU1-CAN-RJ, SK CU1-PBR....................45

Table of contentsl
BU 0750 GB 5
3.4 Overview of special extensions ..............................................................................46
3.4.1 How to install the special extension units.......................................................47
3.4.2 How to remove the special extension module................................................ 48
3.4.3 Encoder I/O special extension........................................................................49
3.4.4 PosiCon I/O special extension .......................................................................50
3.5 Control terminals of customer I/Os.........................................................................51
3.6 Incremental encoder cable colours and connection pin assignment .....................53
4 OPERATION AND DISPLAY......................................................................................................54
4.1 Operating elements of connection varieties ...........................................................55
4.2 ParameterBox handheld type, SK PAR-2H............................................................56
4.3 ParameterBox panel-mounting type, SK PAR-2E..................................................57
4.3.1 Electrical connection ......................................................................................58
4.4 Functions of the ParameterBox..............................................................................59
4.5 Parameters of the ParameterBox...........................................................................66
4.6 Table of ParameterBox error messages ................................................................69
4.7 Data exchange via NORD CON .............................................................................72
5 NORD CON SOFTWARE ...........................................................................................................73
5.1 General ...................................................................................................................73
6 SYSTEM START-UP...................................................................................................................75
6.1 Basic settings .........................................................................................................75
6.2 Basic operation –Condensed instructions .............................................................76
6.3 Minimum configuration of the control terminals......................................................77
7 PARAMETERISATION ...............................................................................................................78
7.1 Display of array parameters ...................................................................................79
7.2 Indication of operational values..............................................................................80
7.3 Basic parameters....................................................................................................81
7.4 Motor data and characteristic curves .....................................................................86
7.5 Control parameters.................................................................................................89
7.6 Control terminals ....................................................................................................93
7.7 Additional parameters...........................................................................................108
7.8 PosiCon ................................................................................................................118
7.9 Information............................................................................................................119
7.10 Parameter list, user settings ...............................................................................125
8 ERROR SIGNALS.....................................................................................................................132
8.1 Error display with the ControlBox .........................................................................132
9 TECHNICAL DATA...................................................................................................................139
9.1 General technical data..........................................................................................139
9.2 Electrical data 230V..............................................................................................140
9.3 Electrical data 400V..............................................................................................140
9.4 Electrical data for UL/cUL approval......................................................................141
10 ADDITIONAL INFORMATION................................................................................................142
10.1 Setpoint processing in the SK 750E frequency inverter .....................................142
10.2 PID controller in the SK 750E.............................................................................144
10.3 Process controller...............................................................................................146
10.3.1 Example of how a process controller could be used..................................146
10.3.2 Parameter settings affecting the process controller ...................................147
10.4 Electromagnetic compatibility (EMC) .................................................................148
10.5 Classes of EMC limit values ...............................................................................148
10.6 Recommendations for service and maintenance ...............................................150
11 INDEX......................................................................................................................................152
12 REPRESENTATION / SUBSIDIARIES...................................................................................154

NORDAC SK 750E manual
6 Technical design subject to change BU 0750 GB
1 General
Based on the proven SK 700E type series, the NORDAC SK 750E design was specifically adapted to demand-
ing industrial environments (up to 60°C, IP54 min.). The devices of this type series are characterized by a high
degree of modularity while ensuring optimal control performance.
Owing to sensorless vectorial current control which involves evaluation of a simulator programme based on a
three-phase asynchronous motor, the relation between voltage and frequency is constantly optimised. Thus
maximum starting and overload torques are available to the drive without the speed having to be increased.
Due to the modular construction of this type series which involves equipment boxes ("technology units"), cus-
tom interfaces and special extensions that can be exchanged with one another as required, adaptation is pos-
sible to any conceivable application.
Due to the huge variety of setting options these inverters are capable of controlling any three-phase motor on
the market. An output range from 5.5kW to 22kW (for 3 AC 400V...480V) and from 5.5kW to 11kW (for 3 AC
200…240V) is available. Line filters being always integrated. These devices allow for an overload capacity of
150 % for 60 seconds or for 200 % for 3.5 seconds respectively.
This manual presupposes that the SK 750E is operated with the V3.4R4 (P707) software. If a different soft-
ware version is stored on the frequency inverter used, accordance with the manual may not always be en-
sured. To be on the safe side the most recent manual should be downloaded from the Internet
(http://www.nord.com/).
1.1 Essentials
Characteristics of the basic unit:
Vectorial current control –for which no sensor is required –ensures a high starting torque and precise
control of the motor speed
Several units can be mounted side by side without leaving a clearance
Admissible ambient temperatures 0 to 50°C (or up to 60°C respectively, please refer to Technical Data
section)
Integrated line filter ensuring EMC and meeting limit curve A requirements as per EN55011
Stator resistance measured automatically
D.C. braking programmable
Integrated braking chopper for four-quadrant operation
Integrated RS485 interface plugged into M12 female connector
Four separate sets of parameters which can be switched while the motor remains on-line
High IP54 degree of protection (air cooling), or IP65 (special design) with water cooling
NOTE: A description of the performance of the basic unit, after it has been fitted with an extra equipment
box (technology unit), a custom interface, or a special extension is given in Section 3, "Options".
1.2 Delivery
Examine the device for transport damage such as distortions or loose parts immediately after it has ar-
rived/been unpacked.
On discovering damage contact the transport company without delay and demand that the damage be as-
sessed in accurate detail.
Important! The same provision shall apply if the packaging is undamaged.

1 General
BU 0750 GB Technical design subject to change 7
1.3 Scope of delivery
Standard package: IP54 type of protection (air cooling) / (IP65 water cooling as a special feature)
→kindly specify your choice when ordering!
Integrated braking chopper
Integrated EMC line filter for limit curve A as per EN55011
Blind cover for the 1st and 2nd equipment box (TU) plug-in section
Screen-receiving angle socket
Operating instructions
Accessories available: brake resistor with high type of protection on request, or else like with SK 700E
(IP20)
RS232 RS485 interface converter (additional description BU 0010)
NORD CON, PC parameterization software > www.nord.com <
ParameterBox, external control panel with LCD clear text display, connecting cable
(additional description BU 0040 GB)
Technology Units:
SK TU2-CTR, ControlBox
detachable control panel, 4-digit 7-segment LED display, keypad
SK TU2-POT, PotentiometerBox
additional module with (R/L) switch and infinitely variable potentiometer
SK TU2-PBR, Profibus, additional module for Profibus communication (1.5MBaud)
SK TU2-PBR-24V, for external 24V supply (12MBaud)
SK TU2-PBR-KL, connection to terminal strip with cover (1.5MBaud)
SK TU2-CAN, CANbus, additional module for CANbus communication
SK TU2-CAO, CANopen, for bus access
SK TU2-DEV, DeviceNet, for bus access
SK TU2-IBS, InterBus, for bus access
SK TU2-AS1, AS-Interface, for bus access
NOTE:
Extra bus module manuals are available –
BU 0020 … BU 0090.
>>> www.nord.com <<<
Custom interfaces:
SK CU1-BSC, Basic I/O, moderate amount of signal processing
SK CU1-STD, Standard I/O, medium amount of signal processing
SK CU1-MLT, Multi I/O, high amount of signal processing
SK CU1-MLT-20mA, Multi I/O, high amount of signal processing
SK CU1-CAN, CANbus I/O, for access to the device via a CANbus
SK CU1-PBR, Profibus I/O, for access to the device via a Profibus DP system
Special extension units:
SK XU1-POS, PosiCon I/O, positioning subassembly
(Additional Instructions BU 0710GB)
SK XU1-ENC, Encoder I/O, incremental encoder input for speed control

NORDAC SK 750E manual
8 Technical design subject to change BU 0750 GB
1.4 Safety and installation instructions
NORDAC SK 750E are operational equipment for use in industrial power plant. That is why touching them may
cause, due to the voltages at which they are operated, serious injuries or even death.
Only skilled personnel qualified in electrotechnical professions are allowed to perform installation or
any other work on the devices provided that these have been previously disconnected from supply.
The personnel involved must have access to the operating instructions at any time and observe them
conscientiously without exception.
Local regulations governing the installation of electric plant as well as any regulations for accident pre-
vention have to be followed.
The device continues to be dangerously live for up to 5 minutes after its disconnection from the mains.
Accordingly the device must not be opened or either the covers or control penels be detached until 5
minutes after it has been disconnected from supply. Reattach all covers before switching the mains
voltage on again.
For the device to be safely disconnected from the mains be sure that each of the poles of the mains
lead to the frequency inverter is disconnected.
Even when the motor has stopped (e.g. following electronic disable, jamming of the drive, or a short
circuit of the output terminals), the supply terminals, the motor terminals, and the terminals for the
braking resistor can conduct dangerously voltages. Even if the motor is not running, it can by no
means be assumed that it is also electrically isolated from the mains.
Caution, parts of the control board and especially the female connector for the detachable equipment
boxes are dangerously live, too. No mains potential is applied to the control terminals, however.
Caution, certain setting configurations may cause the inverter to start up automatically when it is con-
nected to the mains.
The printed circuit boards carry highly sensitive MOS semiconductor components for which static elec-
tricity can be particularly harmful. That is why you should avoid touching the conductive tracks or elec-
tronic components with your hands or with metallic objects. When connecting the cables, use insulated
screwdrivers to manipulate the screws of the terminal strips.
The inverter is intended for permanent connection only and must not be operated without having been
effectively earthed as stipulated by the local regulations for high leakage (> 3,5mA). German VDE
0160 demands that either a second earth conductor be laid or that the earth conductor cross section
be 10mm2 minimum.
If to conform with local regulations the leakage current must not contain any proportion of direct cur-
rent at all, conventional fault-current circuit breakers alone will not afford sufficient protection where
three-phase frequency inverters are concerned. The construction of standard fault-current circuit
breakers is supposed to meet the new VDE 0664 requirements.
NORDAC SK 750E frequency inverters are maintenance-free provided that they are operated accord-
ing to instructions. In a dusty environment the cooling surfaces must be cleaned with compressed air
at regular intervals.
CAUTION
The temperature of the heat sink and of any other metallic parts may rise to more than 70°C.
While working to install the device keep a sufficient distance to components next to your work-
ing area. Do not start working on the components before these have sufficiently cooled down.
CAUTION
DANGER
The power section may still be live up to 5 minutes after disconnection from the mains. Inverter
terminals, motor supply cables and motor terminals may be live, too!
Touching exposed or unconnected terminals, cables, or parts of the device may lead to serious
injuries or even death!
Only skilled personnel qualified in electrotechnical professions are allowed to perform the work
required. Before they do, the device must always have been disconnected from the mains.

1 General
BU 0750 GB Technical design subject to change 9
CAUTION
Ensure that neither children nor the general public will have access to the device or a chance to
manipulate it!
The device must not be used for any purpose other than the one intended by the manufacture.
Unauthorized modifications and the use of replacement parts and attachments which are not sold
or recommended by the manufacturer may cause fire, electric shock, and injuries.
Keep this Manual where it will be accessible to any person involved in using the device or hand it
to him/her on your own accord!
WARNING
This inverter is a device for limited sales according to IEC 61800-3. In a residential environment this
product may cause high-frequent disturbances. If that is the case the user may be requested to take
appropriate steps to ensure effective noise suppression.
Using a line filter of the type recommended by the manufacturer would be such a suitable measure.
1.5 Licenses and approvals
1.5.1 UL and cUL approvals
(For operation in a North American country)
The inverter is suitable for connection to a mains supplying a
200...240V or 380...480V (three-phase) power, provided that the
(symmetrical) short-circuit current does not exceed 5000A, and
that it it protected by "J-class" fuses as specified in Section 7.3.
NORDAC SK 750E frequency inverters include a feature for mo-
tor overload protection. For more detailed information please re-
fer to Section 7.3, Technical data.
1.5.2 European EMC directive
Provided that installation is carried out as recommended in the present manual, the
NORDAC SK 750E will meet all of the EMC directive requirements as stipulated in the
EN61800-3 standard concerning the EMC of products involved in motor-driven systems.
(See also Section 8.3, Electromagnetic compatibility [EMC].)
UL File: E171342

NORDAC SK 750E manual
10 Technical design subject to change BU 0750 GB
1.6 Nomenclature / Type code
The structure of the nomenclature applicable to the NORDAC SK 750E frequency inverter is identical to the
one applicable to the other NORDAC frequency inverters. Accordingly the information contained should be
read and used in a comparable fashion. Apart from unit type and rating, the type designation of the frequency
inverter includes information regarding mains voltage, noise suppression filter, type of protection and special
design features, if any, of the device.
IMPORTANT
Always refer to the nomenclature whenever placing an order or requesting service or support!
SK 750E
-
55
1
-
3
40
-
A
-
W
-
ABC
Special design of device
(3 letters)
IP type of prot. frequency inverter:
space = IP54 type (air cooling)
W = IP65 type (water cooling)
(incl. coated p.c. boards)
Integrated noise suppression filter:
A = class A
Mains voltage:
x23 = 230V,
x40 = 400V
Number of mains phases:
3 = 3 phases
Output inf., place before decimal point:
1 = 0x.x0,
2 = xx.00
Rating of the device (xx):
55 = 5.50kW, …
22 = 22.00kW
Device type series:
SK 750E

1 General
BU 0750 GB Technical design subject to change 11
1.7 Types of protection IP54/IP65
The NORDAC SK 750E frequency inverter is available either with an IP54 type of protection (air cooling) or
with type of protection IP65 (water cooling) irrespective of the frame size or - accordingly - the level of per-
formance. The respective type of protection is apparent from the inverter's type designation. The letter "-W"
(→ water cooling) is added to the end of the type designation of models that are water-cooled.
Whenever you place an order for a frequency inverter, don't forget to specify the type of protection (IP54 or
IP65) you prefer. This information is absolutely required.
The respective types of protection are associated with the modes of cooling. With air-cooled devices it is the
integrated fans which automatically relate the device to the IP54 type of protection, whereas IP65 is attributed
to the devices provided with a flange for water cooling. The effect of the respective type of protection does
not extend to the performance of the equipment boxes (technology units), custom interfaces and special ex-
tension modules however.
IP54 type of protection:
The air-cooled SK 750E inverters are provided with an IP54 type of protection. Both designs (combination of
inverter with motor, installation close to the motor) are available protected this way. This type of protection al-
lows for the standard subassemblies used with the SK 300E (SK TU2-...) and the SK 700E (SK CU1-..., SK
XU1-...) to be fitted to the SK750E as well.
IP65 type of protection:
The letter "-W" ( water cooling) is appended to the type designation of inverters with a water-cooled IP65
type of protection. This type, too, is available for either mode of installation (combination with the motor, instal-
lation close to it). For SK 750E devices protected according to IP65 standards the technology units (SK TU2-
...-C) typically used with the SK 300E are used as well. The type designation of these TU's includes an addi-
tional "-C" (for coated p.c. boards). As with the IP54 devices, the standard SK 700E subassemblies are in-
serted as custom interfaces (SK CU1-...) and special extensions (SK XU1-…).
Important
The designations for the IP65 components and IP66 options (technology units) for the water-cooled
IP65 design include an additional "-C" which refers to the special protection measure mentioned be-
low!
Special provision:
Coated p.c. boards
Important
As for the IP65 type of protection select cable conductors and cable clamp screws with the utmost care
to ensure that they match properly, in order to avoid any leakiness on the SK 750E or other problems
which could result in the IP65 type of protection to be jeopardized!

NORDAC SK 750E manual
12 Technical design subject to change BU 0750 GB
2 Mounting and installation
2.1 On the motor and close to the motor
SK 750E frequency inverters designed for integration are fitted directly to the motor by means of an attachment
frame and "mounting feet" so as to represent a functional drive unit.
Design for integration:
Shown: SK 750E, IP54 design (air-cooled)
Optional Technology Unit
SK TU2-CTR
SK TU2-POT
Optional Technology Unit
Bus subassemblies
Optional custom interface
SK CU1-...
Optional special extension
SK XU1-...
If the SK 750E frequency inverter is designed for installation close to the motor, it can be mounted somewhere
near, as for instance on a wall or on a machine frame. In that case a wall mounting kit will be required (cf. Sec-
tion 2.5).
Installation close to motor:
Optional Technology Unit
SK TU2-CTR
SK TU2-POT
Optional Technology Unit
Bus subassemblies
Optional custom interface
SK CU1-...
Optional special extension
SK XU1-...
Shown: SK 750E, type IP54 (air cooling)

2 Mounting and installation
BU 0750 GB Technical design subject to change 13
2.2 Mounting
NORDAC SK 750E frequency inverters come in different frame sizes according to their power ratings. The
place where the device is mounted should be planned with care so that its performance will not be impaired.
To protect the devices from overheating, sufficient ventilation must be ensured. We recommend that a clear-
ance of 100 mm minimum be maintained between the frequency inverter and any components located above
or below it so as to encourage the air to flow freely in between.
No gaps need however to be provided between devices when they are installed side by side. The mounting
position is always vertical.
100mm
100mm
Make provisions for the hot air above the devices to be effectively removed!
If several inverters are arranged on top of one another, the temperature of the air that is drawn in should not
exceed the specified limit (see also Section 9 Technical Data). It would be a good idea for instance to provide
an "obstacle" (e.g. a cable duct) between the inverters which will divert the upward current of warm air.

NORDAC SK 750E manual
14 Technical design subject to change BU 0750 GB
2.3 SK 750E dimensions
Inverter type
L length
W width
D depth
Wall mounting kit (optional, Section 2.5)
Weight
L1
W1
L2
SK 750E-551-323-A …
SK 750E-751-323-A
414
372 *
255
237.5
165 *
443
401*
220.5
457.5
415.5*
6.5
18.0
SK 750E-551-340-A …
SK 750E-152-340-A
SK 750E-921-323-A …
SK 750E-112-323-A
472
430*
305
253
179 *
501
459*
270.5
516
474*
6.5
23.0
SK 750E-182-340-A …
SK 750E-222-340-A
all dimensions in [mm]
approx.
[kg]
*) water-cooled model
L
W
T

2 Mounting and installation
BU 0750 GB Technical design subject to change 15
2.4 Accessories for attachment of the SK 750E
1. Wall mounting, SK WMK-750E-BG1 or ...-BG2 respectively: When the SK 750E frequency inverter is to
be installed as a stand-alone unit, but close to the motor, it is attached to a suitable mounting surface using
optional mounting brackets.
2. Motor mounting: Alternatively the inverter can be mounted directly on to a Nord three-phase standard
motor (integrated drive). Some additional mounting material is required if this mounting method is adopted.
2.5 SK 750E wall-mounting kit
With the wall-mounting kit it is possible to install the frequency inverter separately from the motor but still close
to it. For the SK 750E to be mounted on a wall, 2 suitable retaining devices are required which can be ordered
as accessory parts. These retainers are screwed on to the back of the SK 750E with the attachment material
supplied along with them. Both wall-mounting kits are in accordance with the standards associated with the
IP54 and IP65 types of protection. The same wall-mounting kit is required for both the air-cooled and the wa-
ter-cooled variety of frame size 1. Where frame size 2 is concerned, the wall-mounting kits for the two varieties
are different however (see table below).
Type
For device with designation
Part number
SK WMK-750E-BG1
SK 750E-551-323-A (-W) ... SK 750E-751-323-A (-W)
SK 750E-551-340-A (-W) ... SK 750E-152-340-A (-W)
275219000
SK WMK-750E-BG2
SK 750E-921-323-A ... SK 750E-112-323-A
SK 750E-182-340-A ... SK 750E-222-340-A
275219010
SK WMK-750E-BG2-W
(to be available soon)
SK 750E-921-323-A -W... SK 750E-112-323-A-W
SK 750E-182-340-A -W... SK 750E-222-340-A-W
275219020
(to be available soon)
SK WMK-750E-BG1
SK WMK-750E-BG2
Components of wall mounting kits:
wall mounting kit:
SK WMK-750E-BG1

NORDAC SK 750E manual
16 Technical design subject to change BU 0750 GB
2.5.1 Dimensions of the SK 750E with wall mounting kit
Note
For the dimensions please read the table in Section 2.2.
W1
W
L
L2
L1
Fig.: SK 750E with SK WMK-750E-BG1

2 Mounting and installation
BU 0750 GB Technical design subject to change 17
2.6 Mounting the SK 750E directly on the motor
A suitable attachment frame and additional "motor attachment feet" enable the frequency inverter to be
mounted directly on the geared motor (integrated drive). Three different attachment frames are available al-
lowing for mounting the device to differently sized motors (132, 160, 180MX/LX).
Attachment frame
for device
Piece number
Attachm. frame-750E-BG1-IEC132
SK 750E-551-323-A ... SK 750E-751-323-A
SK 750E-551-340-A ... SK 750E-751-340-A
275218000
Attachm. frame-750E-BG1-IEC160
SK 750E-112-340-A ... SK 750E-152-340-A
275217000
Attachm. frame-750E-BG2-IEC160
SK 750E-921-323-A ... SK 750E-112-323-A
SK 750E-182-340-A ... SK 750E-222-340-A
275216000
Attachment frame-750E-BG1-IEC132
Attachment frame-750E-BG1-IEC160
Attachment frame-750E-BG2-IEC160

NORDAC SK 750E manual
18 Technical design subject to change BU 0750 GB
2.7 Wiring instructions
The inverters were designed to be operated in an industrial environment where a high level of industrial inter-
ference is to be expected. In general, if installation has been carried out in a workmanlike manner, safe and
trouble-free operation is ensured. For even the limit values of the EMC directives to be met, following the in-
structions given below should eliminate any interference problems.
1) Make absolutely sure that all devices in the cabinet or in the field are effectively earthed using short
earth conductors with a large cross section which should be connected to a common earth connection
point or an earth bus bar. It is of special importance that any control device linked with the inverter (e.g.
an automation device) is connected to the same earth connection point as the inverter itself via a short
conductor with a large cross-sectional area. Flat conductors (such as metal bows) should be preferred
as they show less impedance at high frequencies.
2) The PE conductor of the motor controlled by the inverter should be connected as directly as possible to
the earth connection point which is connected to the heat sink, as should the PE of the mains supply
cable of the respective inverter. By providing a central earth bus bar in the switch cabinet and jointly
connecting all PE conductors to this bar, trouble-free operation is normally ensured (see also Sections
8.3/8.4 EMC directives).
3) Use shielded cables for control circuits if possible. Terminate the screen at the end of the cable care-
fully and see to it that no greater length of wire runs unshielded.
The shield of analogue setpoint cables should be connected to earth at the frequency inverter at one
end only.
4) When laying the wiring a certain distance should be ensured between control lines and load lines, us-
ing for instance separate cable ducts etc. When lines are crossing try to arrange them so as to form a
90° angle.
5) Take appropriate measures to ensure that no interference will be emitted by the contactors in the cabi-
nets. Alternating current contactors should have RC suppressors while direct current contactors should
be provided with freewheeling diodes, with the interference suppression components being fixed
to the contactor coils. Varistors for overvoltage limitation can also be used to achieve the desired ef-
fect of voltage suppression. Especially if the contactors are controlled by the relays in the inverter,
noise suppression is indispensable.
6) Use screened or armoured cables for the load connections (motor cables) and connect the screen-
ing/armouring to earth at both ends, directly at the PE of the frequency inverter or at the angle bracket
connector if possible.
In addition absolutely see to it that the wiring meets the stipulations for EMC (see also Sections 8.3/8.4
EMC). An integrated motor filter is available as an opion if required.
7) Select the lowest possible switching frequency. With this measure the intensity of the electromagnetic
interference produced by the inverter will be reduced.
When installing the inverters never and on no account do anything to violate
the safety regulations!
IMPORTANT
Control lines, supply lines, and motor leads must be laid separately. They should never be laid in
the same conduit/installation duct together.
The test equipment for high-voltage insulation must not be used for cables which are connected to
the inverter.

2 Mounting and installation
BU 0750 GB Technical design subject to change 19
2.8 Electrical connection
WARNING
NOTE
THESE DEVICES MUST BE EARTHED.
For the device to work safely and reliably, it must have been installed and put into operation by
qualified personnel in a workmanlike manner, with all of the instructions mentioned in the present
Operating Manual being followed as specified.
In particular both the generally and locally applicable installation and safety regulations for work on
power installations (e.g. VDE) and the regulations concerning the professional use of tools and the
use of any equipment for personal protection must be observed.
The mains input and the motor connecting terminals may be dangerously live even if the inverter is out of
operation. Always use insulated screwdrivers in these terminal areas.
Make sure that the source of input voltage is disconnected before you establish connections to the
unit or change them.
Make sure that both the frequency inverter and the motor are rated to match the connecting voltage.
Switching the feed line of motor or brake resistance is not allowed under voltage!
2.9 Electrical connection of the power section
The supply, motor, brake resistor, and control terminals are located on the bottom side of the device. To ac-
cess the terminals, the covers (plate and grille) must be removed. Now the connection terminals are accessi-
ble from the front/from below. The cables introduced into the frequency inverter must be fitted with appropriate
clamp screws and pull relief provisions. Before the supply voltage is switched on, all covers must be reat-
tached!
PE
L1
L2
L3
PE L1 L2 L3
+B -B PE
U V W PE
T1 T2
M
3 ~
Power supply
connection
a) 3 ~ 220-240V ~
b) 3 ~ 380-480V ~
c) 3 ~ 460/480V ~
Brake resistor
(chopper)
connection
R 15-40Ω,
details in
chap. 9.2/9.3
3 ~ Motor
connection
delta / star
Temperature
sensor
(PTC)
+Br -Br PE
Electro-
magnetic
brake
connection
a) 105V =
b) 180V =
c) 205V =

NORDAC SK 750E manual
20 Technical design subject to change BU 0750 GB
Before the device is connected the following should be ensured:
1. Make sure that the voltage source is supplying the right voltage and is rated for the required current (cf.
Section 9, Technical data). Besides see to it that a suitable power switch covering the specified nominal
current range is connected between voltage source and frequency inverter.
2. Connect the mains input directly to the mains terminals L1- L2- L3and to earth (PE).
3. Use a four-wire cable to connect the motor. The cable is connected to the motor terminals U - V - W and to
PE.
4. If shielded cables are used (which we recommend), the cable shield can additionally be connected for a
large part to the shield clamping device.
Note: Shielded cables must absolutely be used to ensure the radio interference suppression levels specified
(see also Section 10.4, EMC limit value classes)
IMPORTANT
Make sure that all metallic covers
are properly earthed (see fig. to the
right), otherwise the frequency in-
verter must not be put into opera-
tion.
As a rule, the supply, motor, and brake resistor lines
are wired first as the terminals required are located
on the lower p.c. board. Various metric clamp
screws are provided on the bottom side of the de-
vice and should be used to feed the cables through
(cf. 2.9.7 Cable clamp screws).
NOTE
If used with special end sleeves the maximum cable diameter can be reduced.
NOTE
Whenever synchronous machines are connected or several motors are coupled in paral-
lel, the inverter has to be operated in the linear voltage-to-frequency characteristic mode,
P211 = 0 and P212 = 0.
Steuerklemmenleiste
Netz- Motor- Widerstand- An-
schluß