ABB ACS320 - Page 123

Program features 123
The following figure presents the speed/scalar control block diagram for process
controller PID1.
PID ACT
PID1 Out
1106
n
1102
switch
EXT1/EXT2
Control panel
switch
LOC/REM
1101
switch
Local ref
Panel ref1
Panel ref2
n
value
n
1104
Limiter
PID ACT value
Panel ref2
500%
Limiter
-500%
PID1 Out
Average speed
Const speed 7
Frequency
n
AI Current To rq ue Power COMM ACT
n
AI Current To rq ue Power COMM ACT
4014...4021/
PID act
selection
1103
EXT1 ref
select
1106
EXT2 ref
select
Panel ref1 AI ...
4010/4110*
PID1 ref
select
4014...4021/
PID act
selection
4012,4013/
Limiter
Group 12
Constant
speed
Group 12
Constant
speed
Switch
Group
PID1
controller
1106
Switch
1107
Limiter
Group 30
Alarm speed
Group
PID1
controller
LOC REM
ref
4112,4113*
40/41*
40/41*
4114...4121*
4141...4121*
*Parameter 4027 selects between PID parameter set 1 and 2, ie group 40 and 41.
Panel ref2 AI ... Panel ref2 AI ...
FREQ INPUT FREQ INPUT FREQ INPUT