Characteristics Improvement; Optimal Adjustment Of Cycle Time - Mitsubishi Electric MELDAS MDS-B-SVJ2 Series Specifications And Instruction Manual

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.
①Rapid traverse rate (rapid)
②Clamp speed (clamp)
③Acceleration/deceleration time
constant (G0t , G1t )
④In-position width (SV024)
⑤Position loop gain (SV003)
(1) Adjusting the rapid traverse rate
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. (Only when the rapid traverse rate is below the rated
speed.) Set the same value as the adjusted acceleration/deceleration time constant in the servo
parameter's deceleration control time constant (SV056:EMGt). (When deceleration control is set.)
For motors in which the maximum speed is greater than the rated speed (HC-SF, HC-RF, HC-MF,
HA-FF), the output torque is particularly restricted in the region at or above the rated speed.
When adjusting, watch the current FB waveform during acceleration/deceleration, and adjust so
that the torque is within the specified range. Be careful, as insufficient torque can easily occur
when the amplifier input voltage is low (170 to 190V), and an excessive error can easily occur
during acceleration/deceleration.
HC
Motor type
HC52
HC102*
HC102
HC152*
HC152
HC202*
HC202
HC352*
HC53
HC103
HC153
HC203*
HC R, HC-RF Series
Motor type
HC103R
HC153R
HC203R
HC-RF103
HC-RF153
HC-RF203
CAUTION
Chapter 5 Adjustment
: This will affect the maximum speed during positioning.
: This will affect the maximum speed during cutting.
: Set the time to reach the feedrate.
: This will affect each block's movement command end time.
: This will affect each block's movement command settling time.
Series
Max. current
Motor type
command value
390% or less HA40N
270% or less HA80N
340% or less HA100N
270% or less HA200N*
380% or less
270% or less HA053N
275% or less HA13N
270% or less HA23N
265% or less HA33N
260% or less HA43N
265% or less HA83N
270% or less HA103N*
Max. current
Motor type
command value
225% or less HA-FF053
225% or less HA-FF13
225% or less HA-FF23
225% or less HA-FF33
225% or less HA-FF43
225% or less HA-FF63
When using a range higher than the rated speed for the HC-SF, HC-RF, HA-FF
and HC-MF motor, take special care to the acceleration/deceleration torque. If
the amplifier input voltage is low (170 to 190V), an excessive error could occur
easily during acceleration/deceleration.
When adjusting, decide the acceleration/deceleration time constant from the
motor speed - torque characteristics so that the acceleration/deceleration
torque is within the specifications range. The output torque at high speed
regions can be reduced by using the S-pattern (soft) acceleration/deceleration
function (NC function).
HA N Series
Max. current
command value
420% or less
370% or less
270% or less
270% or less
240% or less
240% or less
235% or less
235% or less
300% or less
280% or less
270% or less
HA-FF Series
Max. current
command value
270% or less
270% or less
270% or less
270% or less
270% or less
270% or less
5-8
HC-SF Series
Max. current
Motor type
command value
HC-SF52 270% or less
HC-SF102 270% or less
HC-SF152 270% or less
HC-SF202 270% or less
HC-SF352 270% or less
HC-SF53 270% or less
HC-SF103 270% or less
HC-SF153 270% or less
HC-SF203 270% or less
HC-SF353 270% or less
HC-MF Series
Max. current
Motor type
command value
HC-MF053 290% or less
HC-MF13 290% or less
HC-MF23 320% or less
HC-MF43 305% or less
HC-MF73 320% or less