Azbil C7G - X84; Z Functional Block Diagram of Heating;Cooling Control; X84; Z Control Action

4-20
Chapter 4. Functions

Functional block diagram of heating/cooling control
PID1
P, I, D (heat)
Switch between heating/cooling PID constants
Heat when 50% ≥ MV
Cool when 50% < MV
Cool P, I, D
PID2
OL, OH (heat)
Cool OL, OH
PID8
PID calculation
(reverse action xed)
MV increase &
decrease change limits
0 to 100 % limit
AT stop
AT execution
AT output
high & low limit
AT processing
Heating/cooling
control dead zone
PV normal
AUTO
MANUAL
READY+AUTO
RUN+AUTO
MANUAL
RUN+AUTO
MANUAL
PV abnormal
Heat/cool output
processing
Heat limit
processing
Cool limit
processing
READY MV (Cool)
PV
PID group selection
MV if PV is bad
READY+AUTO
READY MV (Heat)
MV
Manual MV
(-10 % to +100 %)
C-MV
(Cool MV)
H-MV
(Heat MV)
SP

Control action
Direct or reverse control action can be selected for each control loop.
Item (bank) Display Description Initial value
Control action
(CONTROL bank)
MENU > Control
Control action
0: PID control reverse (heating)
1: PID control direct (cooling)
2: PID control heating/cooling action
3: (Reserved)
4: ON/OFF control reverse (heating)
5: ON/OFF control direct (cooling)
0
Note
4 - 11 TP (Time Proportioning) Output (p.4-68) and
4 - 12 Analog Output (AO) (p.4-72) (for the MV, Cool MV, and Heat MV
output settings)