Grounding - Danfoss EC-C1700B-420 User Manual

User Guide
EC-C1700B-420
Installation
44 | © Danfoss | June 2023
Cable lug length and width

Grounding

Make sure that the electric device is correctly grounded. Do not operate the electric device
without correctly attached protective earth conductor. Obey the installation instructions and
the guidelines for component selection given in this user guide.
The grounding cable must be able to carry the maximum supply fault current which normally
will be limited by the fuses or the Miniature Circuit Breaker (MCB). Put correctly rated fuses or
MCB in the mains supply of the electrical device: obey the local legislation and
recommendations.
Obey the installation instructions and the guidelines for component selection given in this
user guide.
Make sure that the safety grounding is correct. Refer to Chapter Mechanical installation.
Generic grounding guidelines
•
Connect the ground terminal of each electric device individually to the site grounding bus bar.
•
The grounding connections cannot loop from one electric device to another electric device, or to any
other piece of equipment, or from any other piece of equipment.
•
Ground impedance must be compliant with local industrial safety regulations.
•
The protective ground of the unit must be connected to the system ground. Ground impedance must
meet with the requirements of national and local industrial safety regulations and electrical
requirements. The condition of the grounding connections must be checked periodically.
•
Make sure that all grounding surfaces are clean and remove paint from the contact areas.
•
For detailed information, see appropriate Chapters in this user guide.
Main frame
The best grounding is achieved when the main frame of each electric device is directly connected to the
ground. If this is not possible, the electric device must be grounded at least from one of the safety
grounding points with an appropriate grounding cable. For good functional grounding use wide flat
grounding braid. Round grounding wires are adequate for safety grounding but it does not provide very
good functional grounding because of its higher impedance at high frequencies. The grounding points
are marked to the electric device.
BC454142332191en-000101