Electrical Installation; High Voltage Warning; Grounding; Cables - Danfoss VLT 2800 Design Manual

Installation
Side-by-side installation
All VLT 2800 units can be installed side-by-side and in any
position, as the units do not require ventilation on the
side.
Illustration 3.15 Side-by-side Installation - I
Illustration 3.16 Side-by-side Installation - II
CAUTION
If IP21 solution is used, avoid mounting the units side-
by-side, which could lead to overheating and unit
damages.
MG27E402
Design Guide

3.3 Electrical Installation

3.3.1 High Voltage Warning

WARNING
The voltage of the frequency converter is dangerous
whenever the equipment is connected to mains.
Incorrect installation of the motor or frequency converter
may cause damage to the equipment, serious injury or
death. Comply with the instructions in this manual, as
well as national and local rules and safety regulations.
Touching the electrical parts may be fatal - even after
the equipment has been disconnected from mains: Wait
at least 4 minutes for current dissipate.
NOTICE
Ensure correct grounding and protection in accordance
with national and local standards.

3.3.2 Grounding

Comply with the following at installation:
•
•
Connect all grounding systems to ensure the lowest
possible conductor impedance. The lowest possible
conductor impedance is achieved by keeping the
conductor as short as possible, and by grounding with the
greatest possible surface area. If multiple converters are
installed in a cabinet, use the cabinet backplate, which
must be made of metal, as a joint ground reference plate.
Fit the converters to the backplate at the lowest possible
impedance.
To achieve low impedance, connect the converter to the
backplate with the converter fastening bolts. Remove all
paint from the contact points.

3.3.3 Cables

Install the control cable and the mains cable separately
from motor cables to prevent noise transfer. As a rule, a
distance of 20 m is sufficient, but it is recommended that
the distance is as great as possible, particularly when
cables are installed in parallel over large distances.
For sensitive signal cables such as telephone or data
cables, the greatest possible distance is recommended.
Note that the required distance depends on the instal-
Danfoss A/S © Rev. May/2014 All rights reserved.
Safety earthing: The converter has a high leakage
current and must be grounded properly for
safety. Follow all local safety regulations.
High frequency earthing: Keep grounding
connections as short as possible.
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