Vibration And Shock; Air Humidity; Efficiency; Mains Supply Interference/Harmonics - Danfoss VLT FCM Series Manual

A higher switching frequency leads to a quieter running
unit but higher losses in the electronics of the FC motor
and makes an appropriate derating necessary.
See below Torque carateteristic

Vibration and shock

FCM 300 Series has been tested according to a
procedure based on the following standards:
IEC 60068-2-6: Vibration (sinusoidal) - 1970
IEC 60068-2-34: Random vibration broad-band
- general requirements
IEC 60068-2-35: Random vibration broad-band
- high reproducibility
IEC 60068-2-36: Random vibration broad-band
- medium reproducibility
FCM 300 Series complies with requirements
that correspond to conditions in the standards
mentioned above.

Air humidity

FCM 300 Series has been designed to meet
the IEC 60068-2-3 standard, EN 50178 item
9.4.2.2/DIN 40040, class E, at 40°C.
Cyclic damp heat according to IEC 60068-2-30, 40°C.
90
®
VLT FCM Series

Efficiency

2 pole
4 pole

Mains supply interference/harmonics

A FC motor takes up a non-sinusoidal current from
mains, which increases the input current I
nonsinusoidal current can be transformed by means of
a Fourier analysis and split up into sine wave currents
with different frequencies, i.e. different harmonic
currents I with 50 Hz as the basic frequency:
N
Harmonic I
1
currents
Hz 50 Hz 250 Hz 350 Hz 550 Hz
In/I1 [%] 100%
The harmonics do not affect the power consumption
directly, but increase the heat losses in the installation
(transformer, cables). Consequently, in plants
with a rather high percentage of rectifier load, it
is important to maintain harmonic currents at a
low level to avoid overload of the transformer and
high temperature in the cables.
MG.03.H3.02 - VLT is a registered Danfoss trademark
. A
RMS
I I I
5 7 11
44% 29% 8%