Mains Connection; Motor Connection - Danfoss VLT FC51 Design Manual

How to Install

6.7 Mains Connection

Step 1: Mount ground cable.
Step 2: Mount wires in terminals L1/L, L2 and L3/N and
tighten.
6 6
Illustration 6.4 Mounting of Ground Cable and Mains Wires
For 3-phase connection, connect wires to all three
terminals.
For single-phase connection, connect wires to terminals
L1/L and L3/N.
Illustration 6.5 3-phase and Single-phase Wire Connections

6.8 Motor Connection

6.8.1 How to Connect the Motor
See chapter 9 Specifications for correct dimensioning of
motor cable cross-section and length.
•
Use a shielded/armored motor cable to comply
with EMC emission specifications, and connect
this cable to both the decoupling plate and the
motor metal.
•
Keep motor cable as short as possible to reduce
the noise level and leakage currents.
For further details on mounting of the decoupling plate,
®
see VLT Micro Drive FC 51 De-coupling Plate Mounting
Instruction for M1 and M2.
46
®
VLT Micro Drive FC 51 Design Guide
All types of 3-phased asynchronous standard motors can
be connected to the frequency converter. Normally, small
motors are star-connected (230/400 V, Δ/Y). Large motors
are delta-connected (400/690 V, Δ/Y). Refer to motor
nameplate for correct connection and voltage.
Illustration 6.6 Star and Delta Connections
Step 1: Mount the ground cable.
Step 2: Connect wires to terminals either in star or delta-
connection. See motor nameplate for further information.
Illustration 6.7 Mounting of Earth Cable and Motor Wires
For EMC correct installation, use optional de-coupling
plate, see chapter 5.5 Options.
Illustration 6.8 Frequency Converter with De-coupling Plate
MG02K302 - Rev. 2013-12-03