Baumuller b maXX BM3000 User Manual

Configuration
Parameter manual b maXX BM3000
Document no.: 5.12001.07 Baumüller Nürnberg GmbH
112
of 820
4.4
The maximum cross current I
sq max
is calculated from the "Max. drive current actual val-
ue" Z19.5– I
max act
and by reduction the field current. The "Max. drive current actual val-
ue" Z19.5– in general is the same as the maximum drive current Z19.6–. However, this
current and the actual maximum torque can be reduced by the power unit overload mon-
itoring (refer to "Bit mask of external drive current limit" Z138.6–).
Additionally, in the field weakening range the torque is limited by the maximum power.
Therefore, the maximum available torque
Z138.20– is constant in the base speed range.
In the field weakening range it decreases inversely proportional to the speed (see ZFig.
66– on page 112).
Symmetric torque limit
The symmetric torque limit M
limit
(Z138.22–) influences the set value of the cross current
controller, which controls the torque-generating current. The correspondent limit for the
torque-generating current I
sq limit M
must be fit as follows.
with
Flux
setl
Magnetic flux set value in % Z146.13–
Kt Kt = Kt
corr
· Kt factor, in Nm/A
Kt
corr
Kt correction factor, Z138.23–
Kt factor Motor Kt in Nm/A Z107.44–
Torque limits / torque current limits
Figure 66: a) Asynchronous motor: Torque limit above Z138.22– 
b) Asynchronous motor: Overlap of several limits
If there are several torque limits Z138.22–, that result from the torque current limits
Z138.2–, Z138.3–, Z138.14–, Z138.15– or from the breakdown torque-current limit op-
erating simultaneously then the smallest limit is decisive (compare ZFig. 66– (b)). Note:
I
sq limit M
M
limit
Kt
Flux
set
100
-----------------

----------------------------=
n [min ]
N
107.7
N
-1
N
max mech
107.26
max
M
m
[Nm]
(138.20)
M
n [min ]
N
107.7
N
-1
N
max mech
107.26
max
M
m
[Nm]
(138.20)
M
a) b)
5000_0235_rev02_int
Lim
= (Iq ) =f
Lim
(138.22)
Lim
min(138.2,138.3,138.14,138.15)
Lim
(138.22)
M
|| ||
f(138.18)
base speed
range
field weakening
base speed
range
field weakening
effective
limits
=
M
Lim bd

Baumuller b maXX BM3000 Specifications

General

Brand	Baumuller
Model	b maXX BM3000
Category	Measuring Instruments
Language	English