Operating instructions

Operation with only one supply frequency inverter
MICROMASTER 420 / 440 – DC link coupling between several
Frequency inverters
In order to simplify the equation, the following assumptions are made:
cosφ
Motor
= 0.86
V
A
/ V
max
= 1 (operation at the max. frequency inverter voltage)
η
INV
= 0.97
This means the following:
ADC II •= 20.1
At the rated operating point with the rated output current I
AN
:
NN ADC II •= 20.1
The rated currents and the required DC link fuses of the
MICROMASTER420 and MICROMASTER440 frequency inverters are
listed in the following Tables 2-1 and 2-2.
Copyright © Siemens AG 2005 All rights reserved
A&D SD Page 9/32