TOMATECH AUTOMATION
constant is set too small, and the start/end speed is set too large, it is easily to cause
faults such as
drive unit alarm, motor out-of-step or machine vibration.
When the bit parameter No.007 BIT5(SMZ) =1, the feedrate drops to the start speed of
the
ACC&DEC at the cutting path intersection, then it accelerates to the specified speed of
the next block
to obtain an accurate positioning at the path intersection, but this will reduce the
machining efficiency.
When BIT5=0, the adjacent cutting path transits smoothly by the ACC&DEC. The feedrate
does not
always drop to the start speed when the previous path is finished and a circular transition
(non-accurate positioning) will be formed at the path intersection. The machining surface
by this path
transition has a good finish and a higher machining efficiency. When the stepper motor
drive unit is
applied, the BIT5 of the bit parameter No.007 should be set to 1 to avoid the out-of-step.
When the stepper motor drive unit is applied, the out-of-step may occur on the condition
that
rapid traverse speed is too big, ACC&DEC time constant is too small, ACC&DEC
start/end speed is
too big. The suggested parameter setting is as follows (the electronic gear ratio 1:1):
Data parameter No.022 X≤2500 Data parameter No.022 Z≤5000
Data parameter No.023 X≥350 Data parameter No.023 Z≥350
Data parameter No.029≥150 Data parameter No.028≤100
Data parameter No.026≥200 Data parameter No.030≤50
If AC servo drive unit is applied to this system, the machining efficiency can be improved
by a
larger start speed and a smaller ACC&DEC time constant setting. If optimum acc/dec
characteristics
are required, the ACC&DEC time constant may be set to 0 which can be gotten by
adjusting the AC
servo acc/dec parameters. The suggested settings for these parameters are as
follows(electronic
gear ratio is 1:1):
Data parameter No.022 X＝5000 Data parameter No.022 Z＝10000
Data parameter No.023 X≤60 Data parameter No.023 Z≤60
Data parameter No.029≤50 Data parameter No.028≤500
Data parameter No.026≤50 Data parameter No.030≤400
The parameter settings above are recommended for use, please refer to the actual
conditions of
the drive unit, motor characteristic and motor load for their proper setting.
4.5 Mechanical (Machine) Zero Adjustment
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