Short Circuit Brake; Parameter Overview Of The Dc Link Controller - Baumuller b maXX BM3000 Operating Manual

Description of the Software Modules and Parameters
Synchronous motor
The set field current preset value (Z19.9–) is supplied at a synchronous motor. The cur-
rent should be supplied negatively at high speed as otherwise the required voltage could
get too high.
Asynchronous motor
The maximum Id current (Saturation magnetizing current Z146.12–) is supplied at an
asynchronous motor. The motor flux increases with the Id current and thereby the re-
quired voltage. The field weakening controller counteracts the Udc link controller and the
maximum Id current cannot be supplied, if the required voltage exceeds the available volt-
age.
At high speeds it is possible to supply block-shaped Id current with the output of the Udc
link-ld controller. At this process the flux increases and decreases dependent of the ld
current signs. The sign of the ld current changes, if the actual flux value (Z146.14–) ex-
ceeds the limits, which are between 100% of the flux set value and the adjustable thresh-
old (Z114.8–).The block-shaped ld current is supplied above the adjustable threshold
(Z114.7–) - below the threshold positive ld current is supplied, only.

4.7.3.4 Short circuit brake

Synchronous motors are able to be braked using a short circuit brake, additionally. If the
DC link voltage exceeds a set threshold, the motor phases are shorted and the current
no longer flows into the DC link. The motor is decelerated by the resulting current.

4.7.3.5 Parameter Overview of the DC link controller

Functional block:
For Parameter 130.3, see
Number Name
114.1 DC link controller set value
114.2 P-gain of DC link controller
114.3 Tn of DC link controller
114.5 Iq upper limit DC link ctrl
114.6 Iq lower limit DC link ctrl
114.7 Speed threshold for block
shape current
114.8 Flux threshold
FbUzkcontroller [114]
ZPower unit–
Type Min Max
FLOAT 10 850
FLOAT 0.001 256
FLOAT 0 1000
FLOAT 0 10000
FLOAT -10000 0
FLOAT 0 1e9
FLOAT 0 1
Parameter manual b maXX BM3000
from page 91.
Default Value Unit
850 V
0.01 1/V
0.2 ms
10000 A
-10000 A
600000 Grad/
s
0.5 %
Document no.: 5.12001.07
4
Factor
1:1 X
1:1 X
1:1 X
1:1 X
1:1 X
1:1 X
1:100 X X
491
of 820