Cascade Plus / Cas - Honeywell EXCEL 5000 User Manual

EXCEL CARE CONTROL ICONS ALPHABETIC REFERENCE

Cascade Plus / CAS

Function Cascade controller that acts as a PI controller with a master and cascade controller.
Cascade Differences This cascade controller (CAS Plus) acts just like the previous cascade controller
except that it has an integral action enable/disable input. This new function requires
an additional digital input (XD) and two new parameter registers for temporary
storage.
This additional input enables CAS Plus to act as a P controller during plant start-up
and then switch on an Integral component after start-up is complete.
I/O Dialog Box
Excel Web / Excel Web II
Inputs Three analog inputs, where:
X = Master-controlled variable.
XH = Cascade- or auxiliary-controlled variable.
W = Reference variable, also known as setpoint
You can enter the reference variable as a parameter (engineering unit index number
and value). Not for Excel Web / Excel Web II !
One digital input (XD, Excel Web / Excel Web II Icon) that enables and disables
integral control action. When XD is zero, integral action in the master and cascade
controllers is disabled and the associated integral sum is reset. XD/Ion must always
be connected.
Outputs One analog output (Y).
31 74-5577–33 (US)
EN2B-0184 GE51 R0518 (Europe)