AVy - HGB
Ch.5 80
Low voltage general purpose standard motors
VDE 0530: max peak voltage 1kV
max. dV/dt 500 V/us
NEMA MG1 part 30: max. peak voltage 1 kV
min. rise time 2 us
Low voltage motors for use on inverters
NEMA MG1 part 31: max. peak voltage 1.6 kV
min. rise time 0.1 us.
Motors designed for use with Adjustable Frequency Drives do not require any specific filtering of the voltage
waveform from the Drive. For general purpose motors and using drives up to 2075 size, especially with long
cable runs (typically over 100 m [328 feet]) an output choke is recommended to mantain the voltage waveform
within the specified limits. Suggested choke ratings and part numbers are listed in table 5.7.2.1.
The rated current of the filters should be approx. 20% above the rated current of the frequency Drive in
order to take into account additional losses due to PWM waveform.
Table 5.7.2.1: Recommended values for output chokes
Inverter type Three-phase choke type
1007
1015
1022
1030
2040
2055
2075
3110
3150 LU3-015
4185
LU3-022
4220 LU3-022
4300 LU3-030
4370 LU3-037
5450
5550
6750
7900
71100
71320
81600
82000 LU3-200
Avy4150
LU3-160
LU3-055
LU3-090
LU3-003
LU3-005
LU3-011
NOTE! When the Drive is operated at the rated current and at 50 Hz, the output chokes cause a
voltage drop of approx. 2% of the output voltage.
5.7.3. Interference Suppression Filters
The inverters of AVy series must be equipped with an external EMI filter in order to reduce the radiofrequency
emissions on the mains line. The filter selection is depending on the drive size and the installation environment.
For this purpose see the “EMC Guidelines” instruction book.
In the Guide it is also indicated how to install the cabinet (connection of filter and mains reactors, cable shield,
groundig, etc.) in order to make it EMC compliant according the EMC Directive 89/336/EEC. The document
describes the present situation concerning the EMC standards and the compliance tests made on the Gefran
drives.
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