Speed Compensated Stop - ABB ACS560 Firmware Manual

76 Program features
Settings
Parameters 20.25 Jogging enable
208), 20.27 Jogging 2 start source
Jogging 2 ref (page 222),
frequency ref (page
jogging (page 227).


Speed compensated stop

Speed compensation stop is available for example for applications where a conveyer
needs to travel a certain distance after receiving the stop command. At maximum
speed, the motor is stopped normally along the defined deceleration ramp, after the
application of a user defined delay to adjust the distance traveled. Below maximum
speed, stop is delayed still more by running the drive at current speed before the
motor is ramped to a stop. As shown in the figure, the distance traveled after the stop
command is the same in both cases, that is, area A + area B equals area C. Speed
compensation does not take into account shape times (parameters
1 and 23.33 Shape time
Motor speed
Stop
command
Max.
speed
Used
speed
Speed compensation can be restricted to forward or reverse rotating direction.
Speed compensation is supported in both vector and scalar motor control.
Settings
Parameters 21.30 Speed compensated stop mode
stop delay (page 216) and
(page 208),
(page 209),
28.42 Jogging 1 frequency ref
246),23.20 Acc time jogging
2). Positive shape times lengthen the distance traveled.
D1
A B
D2
21.32 Speed comp stop threshold
20.26 Jogging 1 start source
22.42 Jogging 1 ref
(page 246)
(page 227) and
D1 = Delay defined by parameter
21.31
D2 = Additional delay calculated by
speed compensated stop
Area A + Area B = Area C
C
t (s)
(page 216),
(page 216).
(page
(page 222), 22.43
28.43 Jogging 2
23.21 Dec time
23.32 Shape time
21.31 Speed comp