Characteristics Improvement; Optimal Adjustment Of Cycle Time - Mitsubishi Electric MDS-E Series Instruction Manual

MDS-E/EH Series Instruction Manual
5 Servo Adjustment

5.3 Characteristics Improvement

5.3.1 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 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
MDS-E Series (200V)
Motor
model
HG46
HG56
HG96
HG75
HG105
HG54
HG104
HG154
HG224
HG204
HG354
HG123
HG223
HG303
HG453
HG703
HG903
HG142
HG302
IB-1501229-F
Max. current Motor
command value model
Within 380% HG-H75
Within 390% HG-H105
Within 260% HG-H54
Within 350% HG-H104
Within 270% HG-H154
Within 420% HG-H204
Within 350% HG-H354
Within 380% HG-H453
Within 310% HG-H703
Within 310% HG-H903
Within 420% HG-H1502
Within 190%
Within 230%
Within 240%
Within 300%
Within 240%
Within 290%
Within 190%
Within 210%
MDS-EH Series (400V)
Max. current Motor
command value model
Within 350% HQ-H903
Within 270% HQ-H1103
Within 420%
Within 350%
Within 380%
Within 310%
Within 330%
Within 250%
Within 240%
Within 290%
Within 190%
264
Max. current
command value
Within 250%
Within 210%