ABB ACS150 series, User Manual

Page: 167 / 173

164
Appendix: Process PID control
.
PID sleep functionality
The block diagram below illustrates the sleep function enable/disable logic. The
sleep function can be put into use only when the PID control is active.
output
frequency
Compare
1
NOT SEL
INTERNAL
Select
1<2
DI1
And
.
Delay
4023
2
.
4022
%refActive
&
PIDCtrlActive
modulating
t
4024
Set/Reset
S
S/R
1)
R
0132
Compare
1
1>2
NOT SEL
INTERNAL
DI
.
1
.
Select Delay
t
4025
2
.
4022 4026
1) 1 = Activate sleeping
0 = Deactivate sleeping
%refActive: The % reference (EXT REF2) is in use. See parameter 1102 EXT1/EXT2 SEL.
PIDCtrlActive: Parameter 9902 APPLIC MACRO = 6 (PID CONTROL).
modulating: Drive IGBT control is operating
.
Example
The time scheme below visualizes the operation of the sleep function.
Motor speed
t
d
= Sleep delay ( 4024 )
t < t
d
t
d
Sleep
level
( 4023
)
Actual value
Wake-up deviation
( 4025 )
Control panel
display:
PID
SLEEP
t
Stop Start
Wake-up delay
(
4026 )
t