HIMA F3331 Sequence control module

A correction move can be commanded by assigning the value of QS to the YR correction move command. The correction move is issued only after the axis has been stopped. After an error correction move has completed and QS is less than three full motor steps, the YS error status bit is automatically reset back to 1 indicating a cleared error.The following code demonstrates what is necessary to set up SPM mode for a full step drive, a half step drive, and a 1/64th microstepping drive for an axis with a 1.8o step motor and 4000 count/rev encoder. Note the necessary difference is with the YA command.

Error Correction 

The following code demonstrates what is necessary to set up SPM mode for the X axis, detect error, stop the motor, correct the error, and return to the main code. The drive is a full step drive, with a 1.8o step motor and 4000 count/rev encoder.The following example illustrates how the SPM mode can be useful in correcting for X axis friction after each move when conducting a reciprocating motion. The drive is a 1/64th microstepping drive with a 1.8o step motor and 4000 count/rev encoder.

Motion Smoothing

 The DMC-18x2 controller allows the smoothing of the velocity profile to reduce mechanical vibrations in the system. Trapezoidal velocity profiles have acceleration rates which change abruptly from zero to maximum value. The discontinuous acceleration results in jerk which causes vibration. The smoothing of the acceleration profile leads to a continuous acceleration profile and reduces the mechanical shock and vibration.

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