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9. Adjustment
9 - 9
9-3 Characteristics improvement
9-3-1 Optimal adjustment of cycle time
The following items must be adjusted to adjust the cycle time. Refer to the Instruction Manuals provided
with each CNC for the acceleration/deceleration pattern.
<1> Rapid traverse rate (rapid) : This will affect the maximum speed during positioning.
<2> Clamp speed (clamp) : This will affect the maximum speed during cutting.
<3> Acceleration/deceleration time : Set the time to reach the feedrate.
constant (G0t, G1t)
<4> In-position width (SV024) : This will affect each block's movement command end time.
<5> Position loop gain (SV003) : This will affect each block's movement command settling time.
(1) Adjusting the rapid traverse
To adjust the rapid traverse, the CNC axis specification parameter rapid traverse rate (rapid) and
acceleration/deceleration time constant (G0t) are adjusted. The rapid traverse rate is set so that the
motor speed matches the machine specifications in the range below the maximum speed in the motor
specifications. For the acceleration/deceleration time constants, carry out rapid traverse reciprocation
operation, and set so that the maximum current command value at acceleration/deceleration is within
the range shown below. The output torque is limited in areas near the maximum rotation speed, so
when adjusting, view the current FB waveform during acceleration/deceleration and adjust so that the
torque is within the specified range.
If the drive unit's input voltage is less than the rated voltage, the torque will easily become
insufficient, and excessive errors will occur easily during acceleration/deceleration.
(2) Adjusting the cutting feed
To adjust the cutting rate, the NC axis specification parameter clamp speed (clamp) and acceleration/
deceleration time constant (G1t) are adjusted. The in-position width at this time must be set to the
same value as actual cutting.
• Determining the clamp rate and adjusting the acceleration/deceleration time constant
(Features) The maximum cutting rate (clamp speed) can be determined freely.
(Adjustment) Carry out reciprocating cutting feed operation without dwell at the maximum
cutting speed, and adjust the acceleration/deceleration time constant so that the
maximum current command value during acceleration/deceleration is within the
range shown below.
• Setting the step acceleration/deceleration and adjusting the clamp speed
(Features) The acceleration/deceleration time constant is determined with the position loop
in the servo, so the acceleration/deceleration F∆T can be reduced.
(Adjustment) Set 1 (step) for the acceleration/deceleration time constant and carry out cutting
feed reciprocation operation with no dwell. Adjust the cutting feed rate so that the
maximum current command value during acceleration/deceleration is within the
range shown below, and then set the value in the clamp speed.