ABB ACSM1 - Page 160

Parameters and firmware blocks
160
25.04 DEC TIME FW block: SPEED REF RAMP (see above)
Defines the deceleration time, ie, the time required for the speed to change from the speed value
defined by parameter 25.02 SPEED SCALING to zero.
If the speed reference decreases slower than the set deceleration rate, the motor speed will follow the
reference signal.
If the reference changes faster than the set deceleration rate, the motor speed will follow the
deceleration rate.
If the deceleration time is set too short, the drive will automatically prolong the deceleration in order
not to exceed drive torque limits. If there is any doubt about the deceleration time being too short,
ensure that the DC overvoltage control is on (parameter 47.01 OVERVOLTAGE CTRL).
Note: If a short deceleration time is needed for a high inertia application, the drive should be equipped
with an electric braking option, eg, with a braking chopper (built-in) and a braking resistor.
0…1800 s Deceleration time.
25.05 SHAPE TIME ACC1 FW block: SPEED REF RAMP (see above)
Selects the shape of the acceleration ramp at the beginning of the acceleration.
0.00 s: Linear ramp. Suitable for steady acceleration or deceleration and for slow ramps.
0.01…1000.00 s: S-curve ramp. S-curve ramps are ideal for conveyor and lifting applications. The S-
curve consists of symmetrical curves at both ends of the ramp and a linear part in between.
Note: When jogging or emergency ramp stop is active, acceleration and deceleration shape times are
forced to zero.
0…1000 s Ramp shape at beginning of acceleration.
25.06 SHAPE TIME ACC2 FW block: SPEED REF RAMP (see above)
Selects the shape of the acceleration ramp at the end of the acceleration. See parameter 25.05
SHAPE TIME ACC1.
0…1000 s Ramp shape at end of acceleration.
25.07 SHAPE TIME DEC1 FW block: SPEED REF RAMP (see above)
Selects the shape of the deceleration ramp at the beginning of the deceleration. See parameter 25.05
SHAPE TIME ACC1.
0…1000 s Ramp shape at beginning of deceleration.
S-curve ramp:
Par. 25.06 > 0 s
Linear ramp:
Par. 25.05 = 0 s
Linear ramp:
Par. 25.06 = 0 s
S-curve ramp:
Par. 25.05 > 0 s
S-curve ramp:
Par. 25.07 > 0 s
Linear ramp:
Par. 25.08 = 0 s
S-curve ramp:
Par. 25.08 > 0 s
Speed
Time
Speed
Linear ramp:
Par. 25.07 = 0 s
Time