ALPHABETIC REFERENCE EXCEL CARE CONTROL ICONS
74-5577–33 (US) 34
EN2B-0184 GE51 R0518 (Europe)
XH is the supply air temperature (auxiliary controled variable)
W is the room temperature setpoint ( reference variable).
The switching table sets the digital software point Enable_I_comp according to the
following rules:
• Enable the I component 15 minutes after the negative transition of user address
STARTUP. Before this transition, the main and auxiliary controllers act as P
controllers because the I component is switched to zero by the XD digital input in
CAS Plus.
• A manual override in the second column. The override function is active if
Override_enable is 1 (enabled by manual switch). If override is enabled, a user
can switch the I component on and off via Manual_I_Comp no matter what the
status is of STARTUP.
See Appendix B: STARTUP User Address for information on how the user address
operates. This application works only if STARTUP is set according to the information
in Appendix B.
Changeover Switch / CHA
Function Pass an analog input value to one of two outputs depending on the value of the
digital input switch.
Formula If XD1 = 0, set Y1 to X2 and Y2 to 0.
If XD1 = 1, set Y2 to X2 and Y1 to 0.
I/O Dialog Box
Inputs One digital input (XD1).
One analog input (X2).
You can enter the analog input (X2) as a parameter (engineering unit index number
and value).
Outputs Two analog outputs (Y1 and Y2).
NOTE: If an output is not selected (that is, no change in XD1), software sets the
output to 0. Previous calculations are not stored.
Internal Parameters None.
Parameter Number
Descriptions P3 Input X2 if X2 is not connected with a point.
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