7 Additional settings
Mode
The
Mode
is mainly determined by the design and layout of the motor. Three different
modes are available:
l
Self-adjustment method
: With this method, the drive moves over the double search
range in a controlled manner. Depending on the initial position, the drive may jerk.
This method is not suitable for vertical applications.
l
Reaction method
(recommended): This is method is suitable for all types of drives
without a braking system. It is suitable for horizontal and vertical applications. Only
minimal mobility (the system is more or less motionless) is sufficient for
determining the commutation position. This method can also be applied if the drive
permits a certain degree of motion at the output side in spite of an active brake.
l
Saturation method
: This method is not suitable for air-core drives. It requires a drive
with a fixed brake as the drive must be absolutely motionless during the
determination of the commutation position. It is suitable for horizontal and vertical
applications.
Reset
The button
Reset
can be used when the servo drive is set up for the first time. When the
drive is adapted to the application for the first time, this function can help you during the
configuration of the parameters. When the "Commutation position valid" status is reset,
the process will be started when the servo drive is enabled. This means that the methods
can be repeatedly activated in a targeted manner.
Most linear motors are air-core motors. This is why the so-called "reaction method" is
optimally suitable for these motors. It also works well for motors that are vertically
arranged on a stop.
If the current is too high, the reaction method may cause excessive movements. The
current pulses ensure that the drive accelerates and decelerates. If the pulses are too
strong, it may not be possible to stop this movement in time before the next pulse occurs,
thereby leading to an incorrect, useless result. In these cases (e.g. in the case of easy-
running motors), the current must be reduced with the aid of a reduction factor.
The saturation method requires hardly any parameterisation at all. However, if the drive is
not decelerated "sufficiently", small movements may occur and render the measurement
incorrect. In this case, the amplitude can be reduced for the measurement.
The LED
Commutation position valid
indicates that the commutation position has been
successfully determined. This status will be reset, e.g. if an angle encoder error occurs. It
is only relevant for motors with angle encoders without any commutation signals.
Product manual BL 4000-C
Page 159 of 298