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Installation of motor cables
NOTE
If an unscreened cable is used, some
EMC requirements are not complied with.
If the EMC specifications regarding emis-
sion 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 connec-
ted to the metal cabinet of the adjustable
frequency drive and to the metal cabinet
of the motor. The screen connections are
to be made with the biggest possible sur-
face (cable clamp). This is enabled by
different installation devices in the differ-
ent adjustable frequency drives.
Installation with twisted screen ends (pigtails) is to be
avoided, since these spoil the screening effect at high-
er frequencies.
If it is necessary to break the screen to install a motor
isolator or motor contactor, the screen must be con-
tinued at the lowest possible HF impedance.
The adjustable frequency drive has been tested with a
given length of cable and a given cross-section of that
cable. If the cross-section is increased, the cable ca-
pacitance — and thus the leakage current — increa-
ses, and the cable length must be reduced corre-
spondingly.
Connection of motor
All types of 3-phased asynchronous standard motors
can be used with the VLT 5000 Series.
Normally, small motors are star-connected (200/400
V,
ǻ
/Y).
Large motors are delta-connected (400/690 V,
ǻ
/Y).
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
Thedirection of motor rotation can be changed by
switching two phases in the motor cable.
Parallel coupling of motors
Adjustable frequency drives are able to control several
motors connected in parallel. If the motors are to have
different rpm values, the motors must have different
rated rpm values. Motor rpm is changed simultane-
ously, which means that the ratio between the rated
rpm values is maintained across the range.
The total current consumption of the motors is not to
exceed the maximum rated output current I
VLT,N
for the
adjustable frequency drive.
VLT
®
5000 Series
62
MG.51.C5.22 - VLT
p
is a registered Danfoss trademark.
Содержание VLT 5000 Series
Страница 2: ...VLT 5000 Instruction Manual ...
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Страница 45: ...Mechanical dimensions cont VLT 5000 Series 42 MG 51 C5 22 VLT p is a registered Danfoss trademark ...
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Страница 186: ...VLT 5000 Series MG 51 C5 22 VLT p is a registered Danfoss trademark 183 EC EMC ...
Страница 196: ...RELATIVE VLT 5000 Series MG 51 C5 22 VLT p is a registered Danfoss trademark 193 List of functions ...
Страница 197: ...EXTERNAL PRESET VLT 5000 Series 194 MG 51 C5 22 VLT p is a registered Danfoss trademark ...
Страница 198: ...References VLT 5000 Series MG 51 C5 22 VLT p is a registered Danfoss trademark 195 List of functions ...
Страница 202: ...VLT 5000 Series MG 51 C5 22 VLT p is a registered Danfoss trademark 199 List of functions ...
Страница 217: ...VLT 5000 Series 214 MG 51 C5 22 VLT p is a registered Danfoss trademark ...
Страница 238: ...Rev 2006 12 12 www danfoss com drives 175R5271 MG51C522 MG51C522 MG51C522 VLT 5000 Instruction Manual ...
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