Power Chokes; Power Choke Bm50Xx - Baumuller b maXX 5000 Series Instruction Handbook Manual

11.5 Power chokes

It is required to use a power choke when operating (active) mains converter BM50XX and
BM51XX. An operation without power choke is prohibited.
NOTE
UL certified power chokes must be used in UL compliant machines/systems.

11.5.1 Power choke BM50XX

Current Select the power chokes dependent upon your application and based on the input rated
current. Take into account that the max. input current of the chokes may not lead to sat-
uration.
Inductance Select the power chokes depending on the short-circuit voltage of the mains supply, so
that the required mains inductance is adhered to.
NOTE
There is a different short-circuit voltage with the same choke at 60 Hz than there is at
50 Hz; according to the formula u
voltage that would result at another mains frequency can be calculated.
The u
ductance at the rated current, based on the rated voltage.
Therefore, the frequency, the rated current and the rated voltage of the component are
also necessary to determine the u
For the device, however, it is not this voltage drop but the effect of the inductance on com-
mutation notches, harmonic frequencies and the DC link current that is relevant.
If the u
load of the DC link capacitors increases, leading to a rapid aging of the capacitors and
thus reducing the service life of the converter substantially. If the u
then the inductive voltage drop reduces the input voltage of the converter, which conse-
quently results in a reduction of the converter output.
When the mains supply and/or transformer inductance is relatively high to the choke in-
ductance (L
creases disproportionately, which can lead to exceeding of the permissible threshold limit
values (see EN 61000-2-4).
The u
is that, in series connections, the individual inductances can be added, which isn't possi-
ble with the u
value of a transformer or a choke indicates in percent the voltage drop by its in-
k
2  f L I    
rated
u ----------------------------------------- - %
=
k
U
rated
value of the inductive component is too small for the device, then the AC current
k
> 40%
Transformer
value can be converted into inductance. The advantage of the inductance value
k
values.
k
Accessories and spare parts
 
3) / U
= (L I
k N
value.
k

L ), then the harmonic loading of the mains voltage in-
Choke
Instruction handbook b maXX 5000
Document No.: 5.09021.16

(with  = 2
f) the short-circuit
N
value is too large,
k
11
275
of 328