Illustration 2.4 Mains, Motor, and Grounding Connection for
Single-phase Units (K1, K2)
Illustration 2.5 Mains, Motor, and Grounding Connection for 3-
phase Units (K1, K2, K3)
Illustration 2.6 Mains, Motor, and Grounding Connection for 3-
phase Units (K4, K5)
2.2.2 AC Mains Connection
•
Size the wiring based on the input current of the
frequency converter. For maximum wire sizes, see
chapter 7.1 Power-dependent Specications.
•
Comply with local and national electrical codes
for cable sizes.
Procedure
1. Connect the AC input power cables to terminals
N and L for single-phase units (see
Illustration 2.4), or to terminals L1, L2, and L3 for
3-phase units (see Illustration 2.5 and
Illustration 2.6).
2. Depending on the conguration of the
equipment, connect the input power to the
mains input terminals or the input disconnect.
3. Ground the cable in accordance with the
grounding instructions in chapter Grounding in
the VLT
®
Midi Drive FC 280 Operating Guide.
4. When supplied from an isolated mains source (IT
mains or oating delta) or TT/TN-S mains with a
grounded leg (grounded delta), ensure that the
RFI lter screw is removed. Removing the RFI
screw prevents damage to the DC link and
reduces ground capacity currents in accordance
with IEC 61800-3.
Product Overview Design Guide
MG07B102 Danfoss A/S © 03/2016 All rights reserved. 15
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