Danfoss VLT AutomationDrive FC 300 Operating Instructions Manual page 36

How to Install
NOTE
To comply with EMC emission specifications, screened/
armoured cables are recommended. If an unscreened/
unarmoured cable is used, see 4.6.13 Power and Control
Wiring for Unscreened Cables.
See 8 General Specifications for correct dimensioning of
motor cable cross-section and length.
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 to the metal housing
of the motor.
Term. no. 96 97
U V
U1 V1
W2 U2
U1 V1
Table 4.14
1) Protected Earth Connection
NOTE
In motors without phase insulation paper or other
insulation reinforcement suitable for operation with
voltage supply (such as a frequency converter), fit a Sine-
wave filter on the output of the frequency converter.
VLT Automation Low Harmonic Drive Operating Instructions
98 99
W Motor voltage 0-100% of mains voltage.
PE 1)
3 wires out of motor
W1 Delta-connected
PE 1)
V2 6 wires out of motor
W1 1) Star-connected U2, V2, W2
PE
U2, V2 and W2 to be interconnected separately.
®
MG34O202 - VLT is a registered Danfoss trademark
Make the screen connections with the largest possible
surface area (cable clamp). This is done by using the
supplied installation devices within the frequency
converter.
Cable-length and cross-section:
The frequency converter has been EMC tested with a given
length of cable. 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, the
switching frequency must be set according to the
instruction in 14-01 Switching Frequency.
U V W
96 97 98
Illustration 4.24
U V W
96 97 98
35
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