Safety Ground Connection; Adn-Compliant Installation - Danfoss VLT FC 102 Series Design Manual

Electrical Installation
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 prevents having different HF voltages for
the individual devices and prevents the risk of radio
interference currents running in connection cables that
may be used between the devices, as The radio
interference have been reduced.
To obtain a low HF impedance, use the fastening bolts of
6 6
the devices as HF connection to the rear plate. It is
necessary to remove insulating paint and the like from the
fastening points.

6.7.3 Safety Ground Connection

The adjustable frequency drive has a high leakage current
and must be grounded appropriately for safety reasons
according to EN 50178.
WARNING
The ground leakage current from the adjustable
frequency drive 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
terminated separately.
128
Design Guide
2
or two rated ground wires
Danfoss A/S © Rev. 06/2014 All rights reserved.

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 line power switch.
•
Ensure that 14-50 RFI 1 is set to [1] On.
•
Remove all relay plugs marked "RELAY".
See Figure 6.61.
•
Check which relay options are installed, if any.
The only permitted relay option is Extended Relay
Card MCB 113.
1
6
2
5
3
Figure 6.61 Location of Relay Plugs, Pos. 8 and 9
Manufacturer declaration is available upon request.
10
11
7
4
8
9
MG11BC22