Speed Compensated Stop - ABB ACS580 Firmware Manual

Settings
• Menu - Primary settings - Start, stop, reference - Jogging
• Parameters 20.25 Jogging enable
195), 20.27 Jogging 2 start source
22.43 Jogging 2 ref
time jogging (page 214).


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.
Motor speed
Stop
command
Max.
speed
Used
speed
Speed compensation does not take into account shape times (parameters
Shape time 1 and 23.33 Shape time
traveled.
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 203) and
(page 194),
(page 195),
(page 209), 23.20 Acc time jogging
D1
A B
D2
2). Positive shape times lengthen the distance
21.32 Speed comp stop threshold
20.26 Jogging 1 start source
22.42 Jogging 1 ref
(page 214) 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 203),
(page 203).
Program features 121
(page
(page 209),
23.21 Dec
23.32
21.31 Speed comp