West Control Solutions KS98-1 - Manual (Page 46)

I-10.7 Cascade controller
With cascade control, two coupled controllers act on a common actuator. A process value for the master and a pro -
cess value for the slave controller are required.
The slave is determined via the external by the master. Cascade operation is possible in the following statuses:
Automatic mode
In a cascade, master and slave operate automatically during automatic mode. The master and process value are the
relevant variables for process control. The master is adjustable. The process value of the slave
¨ is displayed addi-
tionally.
+ "Cascade" is displayed.
Ü Operating page title
* Parameter set selection, if available
Ö Switchover field cascade mode (open/clo-
sed)
ä source of master (W
int
, W
ext
, W
2
)
# Display field for manual mode (otherwise
empty)
< Physical unit (master block parameter)
> Entry into self-tuning
y Master process value
x Slave process value
c (from master in automatic mode, from sla-
ve with open cascade)
v Bargraph and display
(Y from slave or X/XW from master)
— Display of slave selection with open casca-
de (otherwise empty)
Operating pages 9499-040-82711
I-46 Cascade controller
ambient temperature pre travel temperature
Ь
*
Ц
д
#
<
y
>
c
v
x
b
Fig. 32 Operating page of a cascade controller in automatic