15
Checking the charging capacity
When the power is switched on in the common DC system, the DC link
capacitors in each drive module are charged. The charging current is fed
through the unit(s) connected to AC. Due to this the charging capacity of the
selected supply unit has to be checked.
ACSM1 drive modules in frame sizes A-D have a charging circuit in series
with the capacitor bank.
• In common DC connection, the charging circuits will act in parallel.
• The sum of the charging currents will be fed from the supply.
The charging circuit data for each drive module is shown in the following
table.
ACSM1-04xx- R Rmin
Size Frame ohm ohm
02A5-4 A 50 21.7
03A0-4 A 50 21.7
04A0-4 A 50 21.7
05A0-4 A 50 21.7
07A0-4 A 50 16.5
09A5-4 B 130 14.7
012A-4 B 130 10.4
016A-4 B 130 10.4
024A-4 C 66 8.5
031A-4 C 66 8.5
040A-4 C 66 4.6
046A-4 C 66 4.6
060A-4 D 33 4.6
073A-4 D 33 4.6
090A-4 D 33 4.6
R : Charging resistance of the drive module
R
min
: Minimum value of the total effective charging resistance allowed for
the drive module.
Single AC input
Define the total effective charging resistance R
tot
from the drive modules
connected to DC link.
•
n
tot
RRR
R
111
1
21
+++
=
R values (R
1
, R
2
,…) are the charging resistances of each drive module.
The following condition must be fulfilled.
• R
tot
> R
min
If the condition can not be fulfilled, more than one drive module must be
connected to the AC supply.
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