Technical Data
Instruction handbook b maXX BM4400, BM4600, BM4700
Document No.: 5.12008.07
69
of 358
3
9)
The specified value is only valid, if there is no additional DC link capacity connected to the DC link terminals. See ZPower on switching
frequency / DC link charging– on pag
e 225and ZFigure 34– on page 69.
external DC link capacity [µF]
0
1000
2000
3000
4000
5000
6000
7000
200 250 300 350 400 450 500
BM 4424, 4425, 4426
BM 4422, 4423
BM 4426-XTX-XXX85
Maximum power supply voltage [V]
Figure 34: Maximum external DC
link capacity BM442X
10)
The sum of the transferred mean effective power via the DC link terminals and the transferred mean effective power via the motor ter-
minals may not exceed the specified value co
ntinuously.
11)
The range of the output frequency is based on a stationary operation in the linear range of the PWM, i. e. without overmodulation.
The quality of the generated output voltages depends on the ratio between o
utput frequency and current controller frequency f
I-R
( f
I-R
= 1/cycle time current controller).
The maximum output frequency f
max
, generated with high quality, is calculated as follows:
f
max
f
I-R
K
pf
--------
, typical K
Pf
18=
Furthermore the controller sets an upper limit for the output frequency of 599 Hz (please contact the responsible Baumüller
sales de-
partment, keyword: export restriction).
The range of the output frequency is defined as follows:
PWM frequency Current controller cycle time Range of the output frequency
2 kHz 250 µs 0 - 225 Hz
4 kHz/8 kHz 125 µs 0 - 450 Hz
The controller allows the device to generate output voltages with frequencies between f
max
and 599 Hz. However the quality of this volt-
ages cannot be guaranteed.
Typical the devices are marked with the max output frequency at 4 kHz switching frequency: 0 ... 450 kHz.
12)
The continuously permitted output current must be reduced complying with ZOutput frequency dependent continuous current derating
BM4XXX– on p
age 112, if the statical output frequency is lower than 15 Hz and the frequency remains between 0 and 15 Hz for over
5 seconds.
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