4.4.1 Control Wires
Connect the shields to ground in a proper way to ensure
optimum electrical immunity.
Connect the wires as described in the Operating
Instructions for the frequency converter. Remember to
connect the shields in a proper way to ensure optimum
electrical immunity.
130B
T340.10
Illustration 4.13 Control Cable Installation
4.4.2 Power Connections
Cabling and fusing
NOTICE
Cables General
All cabling must comply with national and local
regulations on cable cross-sections and ambient
temperature. Copper (75
°
C) conductors are
recommended.
The power cable connections are situated as shown below.
The size of the cable cross section is determined according
to the frequency converter's current rating and the local
regulation requirement.
For protection of the frequency converter the correctly
rated fuses must be used or the unit must be with built-in
fuses. The recommended fuses can be seen in the tables in
the fuses section. Always ensure that proper fusing is
made according to the local regulation.
4.4.3 Grounding
The following basic issues need to be considered when
installing a frequency converter to obtain electromagnetic
compatibility (EMC):
•
Safety grounding: The frequency converter could
have a high leakage current. It must be grounded
appropriately for safety reasons. Apply local
safety regulations.
•
High-frequency grounding: Keep the ground wire
connections as short as possible.
Connect the frequency converters to the ground with the
lowest possible conductor impedance. The lowest possible
conductor impedance is obtained by keeping the
conductor short and by using the large possible cross
section conductors.
The metal cabinets of the different devices are mounted
on the cabinet rear plate using the lowest possible HF
impedance. This avoids having different HF voltages for
the individual devices and avoids the risk of radio
interference currents running in connection cables that
may be used between the devices. The radio interference
will have been reduced.
Use the fastening bolts of the devices as HF connection to
the rear plate. It is necessary to remove insulating paint or
similar from the fastening points.
How to Install
Operating Instructions
36
Danfoss A/S © Rev. 05/2014 All rights reserved.
MG33X402
4
4
Содержание VLT Active Front End AFE 302
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