Power chokes
Instruction handbook b maXX BM4400, BM4600, BM4700
Document No.: 5.12008.07 Baumüller Nürnberg GmbH
300
of 358
11.4
11.4 Power chokes
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 shor
t-circuit voltage of the power supply, so
that the required inductance of the power supply see ZRequirements to the energy supply
/ supply system– on page 52 is adhered to.
NOTE!
No po
wer chokes are necessary for the devices BM441X, BM4422, BM4423,
BM4424 and BM4425.
UL certified power chokes must be used in UL compliant machines/systems.
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
= (LI
N
3) / U
N
(with = 2f) the short-circuit
voltage that would result at another power supply frequency can be calculated.
NOTE
The rated inductance is constant up to 1.1 times of rated current. You can expect that
the inductance is reduced, if the current flow through the commutation choke is higher
than this value. If it is important for the application, that the commutation inductance
is equal its rated value when for longer time (e. g. with 30 s or 60 s) peak current at
peak power is needed, chose a commutation choke with a peak current smaller or
equal of the 1.1 times of the rated value of the commutation choke.
If you have any doubt selecting a commutation choke for a specific application,
please contact the responsible sales representative of Baumüller.
NOTE
At installation heights higher than 1000 m above MSL the current must be reduced
for 10 % per 1000 m.
At operation temperatures from 40 °C up to 55 °C the current must be reduced for
1 % per °C
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