Baumuller b maXX 5000 User Manual

Accessories and spare parts
Instruction handbook b maXX 5000
Document No.: 5.09021.16
275
of 328
11
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 c
ompliant 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 sho
rt-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
k
= (LI
N
3) / U
N
(with  = 2f) the short-circuit
voltage that would result at another mains frequency can be calculated.
The u
k
value of a transformer or a choke indicates in percent the voltage drop by its in-
ductance at the rated current, based
on the rated voltage.
u
k
2  fLI
rated

U
rated
------------------------------------------
%=
Therefore, the frequency, the rated current and the rated voltage of the component are
also necessary to determine the u
k
value.
For the device, however, it is n
ot 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
k
value of the inductive component is too small for the device, then the AC current
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
k
value is too large,
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 inducta
nce is relatively high to the choke in-
ductance (L
Transformer
> 40%L
Choke
), then the harmonic loading of the mains voltage in-
creases disproportionately, which ca
n lead to exceeding of the permissible threshold limit
values (see EN 61000-2-4).
The u
k
value can be converted into inductance. The advantage of the inductance value
is that, in series connections, the individual inductances can be added, which isn't possi-
ble with the u
k
values.

Baumuller b maXX 5000 Specifications

General

Brand	Baumuller
Model	b maXX 5000
Category	Servo Drives
Language	English