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4 Servo Adjustment
MITSUBISHI CNC
4-4 Characteristics improvement
4-4-1 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 constant (G0t*, G1t*) : Set the time to reach the feedrate.
[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 at areas near the maximum
speed, so monitor 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.
Maximum tolerable current command value when adjusting the rapid traverse acceleration/deceleration time constant
Motor
model
Max. tolerable
current command
value
Motor
model
Max. tolerable
current command
value
HF75 Within 350% HF-KP13 Within 240%
HF105 Within 270% HF-KP23 Within 250%
HF54 Within 420% HF-KP43 Within 250%
HF104 Within 350% HF-KP73 Within 240%
HF154 Within 380%
HF224 Within 310%
HF204 Within 280%
HF354 Within 230%
HF123 Within 190%
HF223 Within 230%
HF303 Within 240%
HF142 Within 190%
HF302 Within 210%