Operating Modes
Parameter manual b maXX BM5800
Document No.: 5.16029.03 Baumüller Nürnberg GmbH
622
of 814
3.8
m Method 1
The motor must be able to move free of load in any direction with at least twice the val-
ue of Z127.9– Maximum angle. Reducing Z127.9– to values lower than 0.5° does not
result in a pole position search without motion. This is achieved with method 2.
The current set value is linearly (Z127.5– Current rise) increased to the Z127.4– Max-
imum current. The movement of the motor is minimized by adjusting the electric angle
(
Z127.10– Angle rising) during this operation. Based on the starting position the me-
chanical movement is monitored via Z127.13–.
The determination of the notch position is made twice. Both results must be checked
for consistency. If both of the notch positions deviate, a third pole position search must
be done.
Reasons for error 716:
– No conformant notch positions after making three procedures of measuring.
– No conformance check, because of less than two successful measurements.
– The mechanical movement during the procedure is greater than the value of
Z127.11– Error limit mechanical angle change.
– Timeout of 2 minutes for pole position search was exceeded.
Method 1 affects the following factors:
– Notch positions of motor.
– Friction.
– Resolution and quality of encoder signals.
– Setting of current controller see ZAutotuning of Current Controller– from page
181.
– Setting of specific parameters for the operating mode Notch position search.
The default values of these parameters (Z127.5– to Z127.12–) are preset ro-
bust enough for the most drive configurations. Therefore, in general, the default
values must not be changed.
m Method 2
Here the injection procedure is provided.
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:
n The motor is applied with high-frequency voltage, which also causes a clearly audi-
ble noise. The electrical angle is searched via the tracking controller. The voltages
and frequencies are set via the parameters
Z133.3–, Z133.4–, Z133.6– and
Z133.7–.
n 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.
The parameters of the notch position search method 2 (injection method) are addition-
ally used for the sensorless control of the synchronous machines. Therefore, they are
shown in the
ZParameter overview sensorless synchronous motor– from page 665
and are described under ZDescription of the sensorless synchronous motor parame-
ters– from page 666.
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