Cascade Control; Set Point Tracking - ABB COMMANDER 1900 Series Programming Manual

4.1.2 Cascade Control (with output tracking)
Controller 1
Master
PV
RSP
LSP
Master
PV
RSP
LSP

Set Point Tracking

(optional)
Master
PV
RSP
LSP
Set Point Tracking
(optional)
Master
PV
RSP
LSP
Set Point Tracking
(optional)
Controller 2
Auto
PV
P.I.D.
CAS
O/P
Software Link
LSP
Slave Switched to
Manual Mode
Local Set Point
Selected on Slave
Man
PV
P.I.D. O/P CAS
LSP
Software Link
Set Point Tracking
Slave Switched to
Automatic Mode
Man
PV
CAS
P.I.D. O/P
LSP
Software Link
Cascade Set Point
Selected on Slave
Man
PV
P.I.D. O/P CAS
Software Link
LSP
Master Switched to
Automatic Mode
4 CONTROL CONFIGURATION LEVEL...
Slave
Full Automatic Cascade Control Mode
Auto
A ratio and bias can be applied to the
cascade set point (derived from the master
output) to give the required slave set point.
P.I.D.
O/P
To switch to
switch to select manual mode on the slave.
To switch to
set point in
Slave
Manual Mode
Man If the slave is switched from automatic
control to manual control, with cascade set
point
P.I.D.
O/P automatically reverts to local, irrespective of
the output tracking setting. The master is
automatically switched to manual control.
(optional)
Slave
Local Set Point Mode
Auto If local set point is selected on the slave
when in
master is automatically switched to manual
P.I.D.
O/P mode
Slave
To return to
Auto press the
mode on the slave, select cascade set point
in
Operating Page
P.I.D.
O/P
master.
, press the
Manual Mode
, select local
Local Set Point Mode
of the slave.
Operating Page
selected, the set point
Full Automatic Cascade Mode,
Full Automatic Cascade Mode:
switch to select automatic
of the slave and press the
switch to select automatic mode on the
type
the
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