Technical Data
Instruction handbook
b maXX
BM4400, BM4600, BM4700
Document No.: 5.12008.07
103
3
5)
At rated power supply voltage the unit supplies rated / maximum output currents. With input voltages above the rated power supply
voltage the output currents must be reduced at constant output power.
Output curre
nt [%]
Derating of the output current
DC link voltage [V]
Figure 48:
Derating the output current BM445X power modules
6)
The input current must be reduced between 40 °C and 55 °C. See correction factors at changed operating conditions
7)
The peak output current is supplied for the maximum peak current period for the motor at the first acceleration (cold power unit). The in
fact possible overload time is dependent on the preload of the device and on the heat sink temperature, it is determined by the overload
monitoring of the device.
8)
For cooling versions S and A, only.
9)
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 output 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.
10)
The continuously permitted output current must be reduced complying with
Output frequency dependent continuous current derating
on page 112, if the statical output frequency is lower than 15 Hz and the frequency remains between 0 and 15 Hz for over
5 seconds.
Summary of Contents for b maxx BM4400
Page 359: ......
