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OPERATING INSTRUCTIONS
NORDAC compact Frequency Inverter
SK 250/1 FNC
...
SK 2200/1 FNC
SK 250/2 NC
...
SK 22000/2 NC
SK 1500/3 NC
...
SK 37000/3 NC
SK 37000/4 NC
SK 7500/4 NC
...
BU 3300/96 GB
October 1996
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NORDAC compact frequency inverter
Safety and operating instructions for drive converters
in conformity with the low-voltage directive 73/23/EEC
1. General
4. Installation
In operation, drive converters, depending on their degree of
protection, may have live, uninsulated, and possibly also
moving or rotating parts, as well as hot surfaces.
The installation and cooling of the appliances shall be in
accordance with the specifications in the pertinent
documentation.
In case of inadmissible removal of the required covers, of
improper use, wrong installation or maloperation, there is the
danger of serious personal injury and damage to property.
The drive converters shall be protected against excessive
strains. In particular, no components must be bent or isolating
distances altered in the course of transportation or handling. No
contact shall be made with electronic components and contacts.
For further information, see documentation.
Drive converters contain electrostatic sensitive components
which are liable to damage through improper use. Electric
components must not be mechanically damaged or destroyed
(potential health risks).
All operations serving transport, installation and
commissioninng as well as maintenance are to be carried out
by skilled technical personnel (Observe IEC 364 or CENELEC
HD 384 or DIN VDE 0100 and IEC 664 or DIN/VDE 0110 and
national accident prevention rules!).
5. Electrical connection
For the purposes of these basic safety instructions, "skilled
technical personnel" means persons who are familiar with the
installation, mounting, commissioning and operation of the
product and have the qualifications needed for the performance
of their functions.
When working on live drive converters, the applicable national
accident prevention rules (e.g. VBG 4) must be complied with.
The electrical installation shall be carried out in accordance with
the relevant requirements (e.g. cross-sectional areas of
conductors, fusing, PE connection). For further information, see
documentation.
2. Intended use
Instructions for the installation in accordance with EMC
requirements, like screening, earthing, location of filters and
wiring, are contained in the drive converter documentation.
They must always be complied with, also for drive converters
bearing a CE marking. Observance of the limit values required
by EMC law is the responsibility of the manufacturer of the
installation or machine.
Drive converters are components designed for inclusion in
electrical installations or machinery.
In case of installation in machinery, commissioning of the drive
converter (i.e. the starting of normal operation) is prohibited until
the machinery has been proved to conform to the provisions of
the directive 89/392/EEC (Machinery Safety Directive - MSD).
Account is to be taken of EN 60204.
6. Operation
Commissioning (i.e. the starting of normal opertion) is
admissible only where conformity with the EMC directive
(89/336/EEC) has been established.
Installations which include drive converters shall be equipped
with additional control and protective devices in accordance
with the relevant applicable safety requirements, e.g. Act
respecting technical equipment, accident prevention rules etc.
Changes to the drive converters by means of the operating
software are admissible.
The drive converters meet the requirements of the low-voltage
directive 73/23/EEC. They are subject to the harmonized
standards of the series prEN 50178/DIN VDE 0160 in
conjunction with EN 60439-1/ VDE 0660, part 500, and EN
60146/ VDE 0558.
After disconnection of the drive converter from the voltage
supply, live appliance parts and power terminals must not be
touched immediately because of possibly energized capacitors.
In this respect, the corresponding signs and markings on the
drive converter must be respected.
The technical data as well as information concerning the supply
conditions shall be taken from the rating plate and from the
documentation and shall be strictly observed.
During operation, all covers and doors shall be kept closed.
3. Transport, storage
7. Maintenance and servicing
The instructions for transport, storage and proper use shall be
complied with.
The manufacturer's documentation shall be followed.
KEEP SAFETY INSTRUCTIONS IN A SAFE PLACE!
The climatic conditions shall be in conformity with prEN 50178.
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Table of contents
NORDAC compact operating instructions 1
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2 NORDAC compact operating instructions
1 General
The NORDAC compact is an inverter with a constant voltage DC link circuit for variable-speed three-phase AC motors which is cabable of
controlling motors with a rating between 250 watt and 37 kilowatt.
Control is handled by an internal microprocessor. Owing to a special method of pulse width modulation with selectable pulse frequency the
motor is exceedingly quiet in operation. Effective and comprehensive protection of both the inverter and the motor is accomplished by
various protective functions.
The mode of operation of the NORDAC compact unit can be adjusted to virtually any operating conditions by entering special parameter
values using the keys provided for the purpose. Sophisticated speed adjustments, special ramp times, precise stopping and many other
operational features can be achieved since special microcomputer technology has been developed for power electronics applications.
Load compensation is effected automatically by the current control system which permits automatic adaptation to the system requirement
by Flux Current Control (FCC). A programmable ramp generator enables precisely defined acceleration and deceleration of the motor with
adjustable jerk control. (Smoothing)
The programmable or optionally automatic boost feature ensures reliable starting of the motor. High-resolution speed adjustment is
possible.
A programmable DC injection braking permits rapid and defined stopping. An integral brake-chopper ( devices up to 5,5 kW only) together
with the optional braking resistor facilitates driving and braking in both directions of rotation (4-quadrant operation) and can also be used to
produce a high braking torque.
Five programmable binary inputs allow versatile control. A serial interface with bus capability (RS 485) permits easy connection to data
networks as well as the interconnection of up to 31 NORDAC compact units. The inverter is provided with two relay outputs for fault
signals and system messages.
1.1 Delivery
Examine the device immediately after delivery for transport damage such as distortions or loose parts.
If damage has occured contact the transport company without delay, make a careful note of the damage.
Important! This applies even if the packaging is undamaged.
1.2 Scope of delivery
Standard version:
IP 21 panel mounting unit
Operating instructions
Integrated display and keyboard,
from 7,5 kW with clear text display (parameter setting-box)
Integrated brake-chopper up to 5,5 kW
Serial interface RS 485
Accessories available:
Braking resistor IP 20
Braking unit from 7,5 kW
Mains filter for interference suppression
Output choke, for use with long motor cables
Interface converter RS 232 → RS 485
Parameter-software NORDCON
Parameter setting-box
1.3 Installation and operation
Installation:
Installation by qualified personnel only!
Observe local regulations applicable to installation of electrical systems!
Adhere to accident prevention regulations!
Fault current:
Conventional earth-leakage circuit breakers are not suitable as sole protection when the local
regulations do not allow a possible direct current component in the fault current ( see DIN VDE
0160 section 6.5)
Leakage current :
It is not permitted to operate the frequency inverter without effective earthing continuity
according to the local regulations for high leakage current (>3,5mA)!
Before switching on:
Re-attach all covers and guards!
CAUTION! DANGER!
The power section can still be live up to 5 minutes after being disconnected from the mains. Inverter
terminals, motor supply cables and motor terminals can still be live!
 
NORDAC compact operating instructions 3
Touching exposed or unconnected terminals, cables or parts of the device can lead to serious
injuries or even death!
Important note! Caution! A motor stop can be caused by electronic disable, terminal short-circuit or blocked drive.
→ Inverter terminals, motor cables and motor terminals are still live.
→ A motor stop is not synonymous with an electrical isolation from the mains.
→ Automatic run-up of the motor is possible if the inverter is not disconnected from the mains!
The electronic disable facility is not a device as defined by German Accident Prevention Regulations (UVV)!
The terminals of the control board are not at mains potential.
1.4 Wiring guidelines to minimise the effects of EMI
The inverters are designed to operate in an industrial environment where a high level of Electro-Magnetic Interference (EMI) can be
expected. Usually, good installation practices will ensure safe and trouble-free operation. However, if problems are encountered, the
following guidelines may prove useful. In particular, grounding of the system (0V) at the inverter, as descriped below, may prove
effective.
(1) Ensure that all equipment in the cubicle is well earthed using short, thick earthing cable connected to a common star point or
busbar. It is particularly important that any control equipment that is connected to the inverter (such as PLC) is connected to
the same earth or star point as the inverter via a short, thick link. Flat conductors (e.g. metal brackets) are preferred as they
have lower impedance at high frequencies.
The return earth from motors controlled by the inverters should be connected directly to the earth connection (PE) on the
associated inverter.
(2) Use saw-tooth washers when mounting the inverter and ensure that a good electrical connection is made between the
heatsink and the panel, removing paint if necessary.
(3) Wherever possible, use screened leads for connections to the control circuitry. Terminate the ends of the cable neatly,
ensuring that long strands of unscreened wire are not left visible.
(4) Separate the control cables from the power connections as much as possible, using separate trunking, etc. If control and
power cables cross, arrange the cables so that they cross at 90  if possible.
(5) Ensure that the contactors in the cubicle are suppressed, either with R-C suppressors for AC contactors or ÒflywheelÓ diodes
for DC contactors, fitted to the coils . Varistor suppressors are also effective. This is particularly important if the contactors
are controlled from the relays on the inverter.
(6) Use screened or armoured cables for the power connections and ground the screen at both ends. If possible directly at the
frequency inverter-PE.
(7) If the drive is to be operated in a noise-sensitive environment, the RFI filter kit should be used to reduce the conducted and
radiated interference from the inverter. In this case, the filter should be mounted as close to the inverter as possible and well
grounded (see (2) above).
(8) Select the lowest switching frequency possible. This will reduce the amount of EMI generated by the inverter.
On no account must safety regulations be compromised when installing inverters !

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