Control principle
A frequency converter rectifies AC voltage from mains
into DC voltage, after which this DC voltage is conver-
ted into a AC current with a variable amplitude and
frequency.
The motor is thus supplied with variable voltage and
frequency, which enables infinitely variable speed
control of three-phased, standard AC motors.
1. Mains voltage
3 x 200 - 240 V AC, 50 / 60 Hz.
3 x 380 - 460 V AC, 50 / 60 Hz.
3 x 525 - 600 V AC, 50 / 60 Hz.
2. Rectifier
A three-phase rectifier bridge that rectifies AC current
into DC current.
3. Intermediate circuit
DC voltage = 1.35 x mains voltage [V].
4. Intermediate circuit coils
Even out the intermediate circuit voltage and reduce
the harmonic current feedback to the mains supply.
5. Intermediate circuit capacitors
Even out the intermediate circuit voltage.
6. Inverter
Converts DC voltage into variable AC voltage with a
variable frequency.
7. Motor voltage
Variable AC voltage, 0-100% of mains supply voltage.
8. Control card
This is where to find the computer that controls the in-
verter which generates the pulse pattern by which the
DC voltage is converted into variable AC voltage with
a variable frequency.
VLT
®
6000 HVAC Series
16 MG.61.B5.02 - VLT
®
is a registered Danfoss trademark
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