Baumuller b maXX BM2500, Operating Manual

Page: 645 / 822

Description of the Software Modules and Parameters
Parameter manual b maXX BM3000
Document no.: 5.12001.07
645
of 820
4
4.8.9 Notch position search with the injection method
This method is used for applications, where the motor shall not move or shall only move
a bit. However this method can be not used with all motors, as for example with ironless
motors.
The notch position search takes place in two steps:
m
The motor is applied with high-frequency voltage, which also causes a clearly audible
noise. The electrical angle is searched via the tracking controller. The voltages and fre-
quencies are set via the parameters
Z
133.3
–
,
Z
133.4
–
,
Z
133.6
–
and
Z
133.7
–
.
m
In the second step, the notch angle, which was found, is checked if it 180° next to it or
if it is not. The ratio from the 2nd harmonic to the fundamental frequency is checked for
this.
4.8.9.1 Parameter survey and parameter description
Besides the notch position search method 2 (injection method), the parameters are addi-
tionally used for the sensorless control of the synchronous machines. Therefore, they are
shown in the
Z
Parameter overview
–
from page 649 and are described under
Z
Description of the Parameters
–
from page 650.
4.8.9.2 Error response at notch position search 2
The errors 600-602 can occur at notch position search with injection (method 2). The
causes and the possibilities for troubleshooting are listed in the following table:
Error no. Cause Reaction
600 Plausibility error in step 1.
The results of the notch posi-
tion search do not agree Increase the injected current in step 1:
1: Via a higher voltage (
Z
133.3
–
)
2. Via a less frequency (
Z
133.2
–
)
Or increase the gain of the compensating controller (
Z
133.5
–
).
Please note: better results are yielded at higher frequencies
601 Plausibility error in step 2.
The part of the second har-
monic is too small. Increase the injected current in step 2:
1: Via a higher voltage (
Z
133.7
–
)
2. Via a less frequency (
Z
133.6
–
)
Or decrease minimum rate of the 2nd Harmonic (
Z
133.10
–
)
(Only if it is secured, that the lesser minimum rate is enough.)
602 Overcurrent during notch posi-
tion search method 2 Decrease the injected current in step 2:
1: Via a less voltage (
Z
133.7
–
)
2. Via a higher frequency (
Z
133.6
–
)