Current Setting For Initial Magnetic Field Detection - Delta ASDA-A3 Series User Manual

Linear Motor and Third-Party Motor

11.7.4 Current setting for initial magnetic field detection

PM.011 (Current setting for initial magnetic field detection) is a parameter used for the linear
motor without a Hall sensor (PM.003.Y = 0). When the linear motor without a Hall sensor is
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powered on and the servo is switched On for the first time, the servo drive outputs the current
set in PM.011 to drive the motor and can obtain the motor's present magnetic field information
by automatically detecting the initial magnetic field when the motor slightly moves. There are
two modes for initial magnetic field detection: quick mode (PM.012 [Bit 14] = 0) and smooth
mode (PM.012 [Bit 14] = 1).
During the detection, the current setting affects how subtle the movement of the linear motor is.
With the appropriate current setting, the friction between the motor and the mechanical part can
be overcome and the servo drive can complete the initial magnetic field detection. Excessive
current causes excessive movement of the linear motor, which may result in mechanical part
collision. On the other hand, when the current is too low, the friction may not be overcome and
the servo drive is unable to detect the initial magnetic field, thus triggering AL052. For the
settings of PM.011, refer to Chapter 8 Parameters.
When executing the motor parameter identification for the motor of the Z axis, ensure to place
the translation stage under the mechanical part at a balanced position, and set PM.012 [Bit 12]
and [Bit 13] according to the feedback position of the motor and the condition of the mechanical
limits. Then, you can execute the initial magnetic field detection.
Note that if you are using a motor with a brake for the Z axis, it is prohibited to use the initial
magnetic field detection function. Install a Hall sensor or use an absolute motor instead.
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ASDA-A3