ABB ACS880-11 - Page 68

68 Program features
Tracking
In tracking mode, the PID block output is set directly to the value of parameter 40.50
(or 41.50) Set 1 tracking ref selection. The internal I term of the PID controller is set
so that no transient is allowed to pass on to the output, so when the tracking mode is
left, normal process control operation can be resumed without a significant bump.
Settings
• Parameter 96.04 Macro select (macro selection)
• Parameter groups 40 Process PID set 1 (page 311) and 41 Process PID set 2
(page 324).
Wake-up level
(Setpoint - Wake-up deviation [40.47])
t < t
sd
PID controller output
Actual value
STOP
t
sd
= Sleep delay (40.44)
Sleep level
(40.43)
START
Wake-up delay
(40.48)
t
sd
Setpoint
Time
Sleep boost step (40.46)
Sleep mode
Sleep boost time (40.45)
Time
Time
Non-inverted
(40.31 = Not inverted (Ref - Fbk))
Wake-up level
(Setpoint + Wake-up deviation [40.47])
Actual value
Time
Inverted (40.31 = Inverted (Fbk - Ref))