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AKD 5000
Installation
■
Electrical installation - EMC precautions
The following is a guideline to good engineering
practice, when installing drives. Following these
guidelines is advised, where compliance with EN
50081, EN 55011 or EN 61800-3
First environment
is
required. If the installation is in EN 61800-3
Second
environment,
then it is acceptable to deviate from these
guidelines. It is however not recommended. See also
CE labelling, Emission
and
EMC test results
under
special conditions in the Design Guide for further details.
Good engineering practice to ensure EMC-correct
electrical installation:
•
Use only braided screened/armoured motor cables
and braided screened/armoured control cables. The
screen should provide a minimum coverage of 80%.
The screen material must be metal, not limited to
but typically copper, aluminium, steel or lead. There
are no special requirements for the mains cable.
•
Installations using rigid metal conduits are not
required to use screened cable, but the motor
cable must be installed in conduit separate from
the control and mains cables. Full connection
of the conduit from the drive to the motor is
required. The EMC performance of flexible
conduits varies a lot and information from the
manufacturer must be obtained.
•
Connect the screen/armour/conduit to earth
at both ends for motor cables as well as for
control cables. See also
Earthing of braided
screened/armoured control cables
.
•
Avoid terminating the screen/armour with
twisted ends (pigtails). Such a termination
increases the high frequency impedance of the
screen, which reduces its effectiveness at high
frequencies. Use low impedance cable clamps
or EMC cable glands instead.
•
It is important to ensure good electrical contact
between the mounting plate on which the frequency
converter is installed and the metal chassis of
the frequency converter. This however does
not apply to IP54 units as they are designed for
wall mounting and AKD 5032-5052, 200-240
VAC in IP20/Nema1 enclosure.
•
Use starwashers and galvanically conductive
installation plates to secure good electrical
connections for IP00 and IP20 installations.
•
Avoid using unscreened/unarmoured motor or
control cables inside cabinets housing the drive(s),
whenever this can be avoided.
•
An uninterrupted high frequency connection
between the frequency converter and the motor
units is required for IP54 units.
The illustration shows an example of an EMC-correct
electrical installation of an IP 20 frequency converter;
the frequency converter has been fitted in an installation
cabinet with an output contactor and connected
to a PLC, which in this example is installed in a
separate cabinet. In AKD 5032-5052, 200-240
VAC in Nema 1/IP20 enclosure screened cables
are connected by using EMC conduits to ensure
proper EMC performance. See illustration. Other
ways of making the installation may have as good
an EMC performance, provided the above guide
lines to engineering practice are followed.
Please note, that when the installation is not carried
through according to the guideline as well as when
unscreened cables and control wires are used, some
emission requirements are not complied with, although
the immunity requirements are fulfilled. See the section
EMC test results
in the Design Guide for further details.
MG.50.R3.02 -
31
Содержание AKD 5001
Страница 12: ...AKD 5000 Introduction Ordering form AKD 5000 Series Typecode MG 50 R3 02 11 ...
Страница 25: ...AKD 5000 Type F IP54 MG 50 R3 02 24 ...
Страница 29: ...AKD 5000 Compact IP 54 AKD 5001 5006 200 240 V AKD 5001 5011 380 500 V MG 50 R3 02 28 ...
Страница 33: ...AKD 5000 MG 50 R3 02 32 ...