VLT® 7000 Booster
■
Direction of motor rotation
The factory setting is for clockwise rotation with the
frequency transformer output connected as follows.
Terminal 96 connected to U-phase
Terminal 97 connected to V-phase
Terminal 98 connected to W-phase
The direction of motor rotation can be changed by
switching two phases in the motor cable.
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Motor cables
See
Technical data
for correct sizing of motor
cable cross-section and length.
Always comply with national and local regulations
on cable cross-sections.
NB!:
If an unscreened cable is used, some
EMC requirements are not complied with,
see
EMC test results
.
If the EMC specifications regarding emission are
to be complied with, the motor cable must be
screened, unless otherwise stated for the RFI filter
in question. It is important to keep the motor cable
as short as possible so as to reduce the noise level
and leakage currents to a minimum.
The motor cable screen must be connected to the
metal cabinet of the frequency converter and to the
metal cabinet of the motor. The screen connections
are to be made with the biggest possible surface (cable
clamp). This is enabled by different installation devices
in the differentT frequency converters. Mounting with
twisted screen ends (pigtails) is to be avoided, since
these 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.
MG.70.A1.02 - VLT is a registered Danfoss trademark
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