
7.FEEDRATE CONTROL/ACCELERATION AND DECELERATION CONTROL B-63943EN-1/02
- 798 -
P0
P1 P2
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
0 8000 16000 24000 32000 40000 48000
Speed mm/min
Acceleration mm/sec
2
P5
Fig. 7.2.5 (n) Acceleration pattern in case of - move and deceleration
Limitation
- Linear type positioning
Optimum torque acceleration/deceleration is not enabled unless
linear-type positioning is set (bit 1 (LRP) of parameter No. 1401 is set
to 1).
- Modes and conditions
Optimum torque acceleration/deceleration is enabled when look-ahead
acceleration/deceleration before interpolation (or AI contour) control
mode is active and the conditions under which look-ahead accel-
eration/deceleration before interpolation is performed are satisfied.
- Target axes
Optimum torque acceleration/deceleration cannot be performed for a
specific axis only. All axes operated by programmed commands are
targeted for optimum torque acceleration/deceleration. This means
that the PMC axes are excluded.
- Acceleration pattern
In the same direction move, it is necessary that the acceleration during
deceleration is set 1/3 of one during acceleration at least.
Also, the acceleration pattern data must be set so that the time required
for the deceleration from the rapid traverse rate to a speed of 0 does
not exceed 4000 (msec). This does not include the acceleration change
time of bell-shaped acceleration/deceleration.
If the deceleration acceleration ratio or the time required for the
deceleration to a speed of 0 exceeds the above range, alarm (DS1710)
will be issued at the time rapid traverse is executed.
A slight error will occur between the specified acceleration and the
actual acceleration.