VLT® 8000 AQUA
■ EMC-correct electrical installation
525-600 V units do not comply with European
EMC and Low Voltage Directives.
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 in this manual.
G
ood engineering practice to ensure EMC-correct
electrical installation:
• Use only braided shielded/armored motor cables
and braided shielded/armored control cables. The
shield should provide a minimum coverage of 80%.
The shield material must be metal, not limited to
but typically copper, aluminum, steel or lead. There
are no special requirements for the line cable.
• Installations using rigid metal conduits are not
required to use shielded cable, but the motor
cable must be installed in conduit separate from
the control and line 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 shield/armor/conduit to ground
at both ends for motor cables as well as for
control cables. See also Grounding of braided
shielded/armored control cables.
• Avoid terminating the shield/armor wit
h twisted
ends (pigtails). Such a termination increases the
high frequency impedance of the shield, which
reduces its effectiveness at high fre
quencies.
Use low impedance cable clamps or EMC
cable glands instead.
• It is important to have good electric
al contact
between the mounting plate on which the AFD is
installed and the metal chassis of the AFD unit.
Exception:
- IP54/NEMA 12 units designed for wall mounting
- VLT 8152-8600 (380-480 V) IP20/NEMA 1
- VLT 8042-8062 (200-240 V) IP20/
NEMA 1
This however does not apply to IP54/NEMA 12
units as they are designed for wall mounting and
VLT 8152-8600, 380-480 VAC and VLT 8042-8062,
200-240 VAC in IP20/NEMA 1 enclosure.
• Use starwashers and galvanically conductive
installation plates to secure good electrical
connections for IP00/Chassis and IP20/NEMA
1 installations.
• Avoid using unshielded/unarmored motor or
control cables inside cabinets housing the drive(s),
whenever this can be avoided.
• An uninterrupted high frequency connection
between the AFD and the motor is required
for IP54/NEMA 12 units.
The next illustration shows an example of an
EMC-correct electrical installation of an IP 20/NEMA
1 AFD; the AFD has been installed in a cabinet
(enclosure) together with an output contactor and is
connected to a PLC which, in this example, is installed
in a separate cabinet. For IP 54/NEMA 12 units, VLT
8152-8600 (380-480 V) and VLT 8042-8062 (200-240
V) units in IP20/NEMA 1 enclosures; shielded cables
are connected by using EMC conduits to assure proper
EMC performance. (See next illustration.)
Other ways of making the installation may give as
good an EMC performance, provided the above
engineering practice guidelines are followed.
Please note, that when the installation is not made
according to these guidelines as well as when
unshielded cables and control wires are used, some
emission requirements are not complied with, although
the immunity requirements are fulfilled.
MG.80.A6.22 - VLT is a registered Danfoss trademark
56
(4 pagine)
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