ABB ACS800 Series Firmware Manual page 96

84
No. Name/Value
22.02 ACCEL TIME 1
0.0...99999.0 s
22.03 DECEL TIME 1
0.0...99999.0 s
22.04 ACCEL TIME 2
0.0...99999.0 s
22.05 DECEL TIME 2
0.0...99999.0 s
22.06 SHAPE TIME
0.00...1000.00 s
Actual signals and parameters
Description
Defines the acceleration time 1 i.e. the time required for the speed to
change from zero to the maximum speed.
- If the speed reference increases faster than the set acceleration
rate, the motor speed will follow the acceleration rate.
- If the speed reference increases slower than the set acceleration
rate, the motor speed will follow the reference signal.
- If the acceleration time is set too short, the drive will automatically
prolong the acceleration in order not to exceed the drive operating
limits.
Acceleration time
Defines the deceleration time 1 i.e. the time required for the speed to
change from the maximum 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 operating limits.
If there is any doubt about the deceleration time being too short,
ensure that the DC overvoltage control is on.
Note: If a short deceleration time is needed for a high inertia
application, the drive should be equipped with an electric braking
option e.g. with a braking chopper and a braking resistor.
Deceleration time.
See 22.02 ACCEL TIME 1.
Acceleration time.
See 22.03 DECEL TIME 1.
Deceleration time.
0.0 s: Linear Ramp. Suitable for steady acceleration or deceleration
and for slow ramps.
0.01 to 1000.0 s: S-curve Ramp. S-curve ramps are ideal for
conveyors carrying fragile loads, or other applications where a smooth
transition is required when changing from one speed to another. The
S-curve consists of symmetrical curves at both ends of the ramp and a
linear section in between.
Speed
Max
A rule of thumb:
A suitable relation
between the ramp
shape time and the
acceleration ramp
time is 1/5.
Acceleration time.
Linear ramp: 22.06 = 0 s
S-curve ramp:
22.06 > 0 s
22.02 22.06
FbEq
10 = 1 s
10 = 1 s
10 = 1 s
10 = 1 s
t
100 = 1 s