Multiple Ac Input; Charging Current - ABB ACSM1 System Manual

16

Multiple AC input

Define R
resistance as follows.
•
R
min
the drive modules connected to the AC supply.
The following condition must be fulfilled:
•

Charging current

Typical AC input line current waveform and the DC link voltage during the
charging is shown in the figure below.
It must be checked that the AC supply side components (fuses, contactors,...)
can withstand the peak current.
The peak current I
•
where the U
generally about 0.3 s (U
as in the previous case. Define the effective total minimum
tot
=
R
1
min
+
R R
min 1 min
values (R , R ,...) are the individual minimum resistance values of
min1 min2
R > R
tot min
I
ac,peak
is calculated as follows.
ac,peak
×
2 U
=
I
ac
ac , peak
R
tot
is the line to line supply voltage. The charging time is
ac
dc
1
1 1
+ +
R
2 n
> 95% U ) with ACSM1 drive modules.
dcN