ABB ACS150 - Select

Actual signals and parameters
87
2202 ACCELER TIME 1 Defines the acceleration time 1 i.e. the time required for the speed to change
from zero to the speed defined by parameter 2008 MAXIMUM FREQ.
- 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.
Actual acceleration time depends on parameter 2204 RAMP SHAPE 1
setting.
5
0.0…1800.0 s Time
2203 DECELER TIME 1 Defines the deceleration time 1 i.e. the time required for the speed to change
from the value defined by parameter 2008 MAXIMUM FREQ 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 a short deceleration time is needed for a high inertia application, the drive
should be equipped with a brake resistor.
Actual deceleration time depends on parameter 2204 RAMP SHAPE 1
setting.
5
0.0…1800.0 s Time
2204 RAMP SHAPE 1 Selects the shape of the acceleration/deceleration ramp 1. The function is
deactivated during emergency stop (2109 EMER STOP SEL) and jogging
(1010 JOGGING SEL).
0
0.0…1000.0 s 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 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 part in between.
Parameters in the Long Parameter mode
Index Name/Selection Description Def
Linear ramp: Par. 2204 = 0 s
S-curve ramp:
Par. 2204 > 0 s
A rule of thumb
A suitable relation between the
ramp shape time and the
acceleration ramp time is 1/5.
Speed
t
Max
Par. 2202 Par. 2204