Specifications

6.7.2 Grounding
The following basic issues need to be considered when
installing a frequency converter, so as to obtain electro-
magnetic compatibility (EMC).
•
Safety grounding: The frequency converter has a
high leakage current and 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 different ground systems at the lowest
possible conductor impedance. The lowest possible
conductor impedance is obtained by keeping the
conductor as short as possible and by using the greatest
possible surface area.
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
have been reduced.
To obtain a low HF impedance, 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.
6.7.3
Safety Ground Connection
The frequency converter has a high leakage current and
must be grounded appropriately for safety reasons
according to EN 50178.
WARNING
The ground leakage current from the frequency
converter exceeds 3.5 mA. To ensure a good mechanical
connection from the ground cable to the ground
connection (terminal 95), the cable cross-section must be
at least 10 mm
2
or 2 rated ground wires terminated
separately.
6.7.4 ADN-compliant Installation
Units with ingress protection rating IP55 (NEMA 12) or
higher prevent spark formation, and are classified as
limited explosion risk electrical apparatus in accordance
with the European Agreement concerning International
Carriage of Dangerous Goods by Inland Waterways (ADN).
For units with ingress protection rating IP20, IP21, or IP54,
prevent risk of spark formation as follows:
•
Do not install a mains switch
•
Ensure that 14-50 RFI Filter is set to [1] On.
•
Remove all relay plugs marked “RELAY”. See
Illustration 6.61.
•
Check which relay options are installed, if any.
The only permitted relay option is Extended Relay
Card MCB 113.
130BC301.11
1
2
3
4
5
6
7
8
9
10
11
Illustration 6.61 Location of Relay Plugs, Pos. 8 and 9
Manufacturer declaration is available upon request.
6.8
EMC-correct Installation
6.8.1 Electrical Installation - EMC
Precautions
The following is a guideline to good engineering practice
when installing frequency converters. Follow these
guidelines to comply with EN 61800-3 First environment. If
the installation is in EN 61800-3 Second environment, i.e.
industrial networks, or in an installation with its own
transformer, deviation from these guidelines is allowed but
not recommended. See also paragraphs chapter 2.2 CE
Labelling, chapter 2.9 General Aspects of EMC and
chapter 2.9.2 EMC Test Results.
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
Electrical Installation
Design Guide
116 Danfoss A/S © Rev. 06/2014 All rights reserved. MG11BC02
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