Technical Data
Instruction handbook
b maXX
BM5500, BM5600, BM5700
Document No.: 5.13008.10
75
3
14)
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
125 µs
0 - 450 Hz
8 kHz
62.5 µs
0 - 599 Hz (900 Hz
*)
)
*)
900 Hz could be generated by the controller
The device is able to generate output voltages with frequencies between f
max
and 599 Hz and the controller allows that, however the
quality of this voltages cannot be guaranteed.
Typical the devices are marked with the max output frequency at 4 kHz switching frequency: 0 ... 450 kHz.
15)
The continuously permitted output current must be reduced complying with
Output frequency dependent continuous current derating
on page 119 if the statical output frequency is lower than 15 Hz and the frequency remains between 0 and 15 Hz for more
than 5 seconds.
16)
The life time of the brake transistor depends on a large extent on the load cycle, a load cycle (braking period) of shorter than 18 s re-
duces the brake transistor‘s life time to below 20 000 hours.
17)
Between the min. waiting time (internal DC link capacitance only) and the max. waiting time (max. DC link capacitance) can be linearly
interpolated depending on the total capacitance value.
18)
The distortion factor of the input current is approx. twice as much the factor at operation with power choke.
The user has to check with the local power supplier whether an operation without power choke is allowed.
19)
Operating the device without power choke causes an increase of the AC component of the DC link voltage compared with the operation
using a power choke. As result the minimum DC link voltage can be lower than the value with power choke. Therefore the voltage re-
serve can be too low at high speed.
Summary of Contents for b maXX 5500
Page 315: ......
