Danfoss VLT AutomationDrive FC 300 Design Manual page 189

Electrical Installation
NOTICE
Use mains cables of equal length ( ±10%) and the same
wire size for all 3 phases on both rectifier sections.
Screening of Cables
Avoid installation with twisted screen ends (pigtails). They
spoil the screening effect at higher frequencies. If it is
necessary to break the screen to install a motor isolator or
motor contactor, the screen must be continued at the
lowest possible HF impedance.
Connect the motor cable screen to both the de-coupling
plate of the frequency converter and the metal housing of
the motor.
Make the screen connections with the largest possible
surface area (cable clamp) using the supplied installation
devices within the frequency converter.
Cable-Length and Cross-Section
Keep the motor cable as short as possible to reduce the
noise level and leakage currents.
Switching Frequency
When frequency converters are used together with sine-
wave filters to reduce the acoustic noise from a motor, set
the switching frequency according to the instruction in
14-01 Switching Frequency.
Term. 96 97 98 99
no.
U V W 1)
PE
U1 V1 W1
PE 1)
W2 U2 V2
U1 V1 W1
PE 1)
Table 7.25 Terminals
1)
Protective Earth Connection
NOTICE
In motors without phase insulation paper or other
insulation reinforcement suitable for operation with
voltage supply, fit a sine-wave filter on the output of the
frequency converter.
®
VLT AutomationDrive FC 300 Design Guide 90-1200 kW
Motor voltage 0–100% of
mains voltage.
3 wires out of motor
Delta-connected
6 wires out of motor
Star-connected U2, V2, W2
U2, V2, and W2 to be intercon-
nected separately.
MG34S202 - Rev. 2013-08-19
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187