Orion System MODGAS II - Manual (Page 19)

MODGAS II Controller Section 2
Programming 2-3
Status Screen #2
Change Setpoints
MODGAS II Controller Setpoints
Accessed from Main Menu Screen #1 – Menu Item #2
Setpoint Screen #1
Minimum Default Maximum
Proportional Kp 1 20 70
Integral Ki 0 5 90
Setpoint Screen #2
Minimum Default Maximum
Derivative Kd 0 5 90
Unwind Signal 0 5 30
Line 2 - Max Setpoint = This is the value from the RESET
LIMIT DIP switch on the MODGAS II Controller.
This is the value that the controller will use as the
Discharge Temperature Setpoint when the RESET
INPUT voltage signal is at 10 VDC.
NOTE: It is acceptable for this value to be less than
the MIN Setpoint for reverse acting control schemes.
Line 3 - Min Setpoint = This is the value from the
DISCHARGE SETPOINT Dip switch on the
MODGAS II Controller. This is the value that the
controller will use as the Discharge Temperature
Setpoint when the RESET INPUT voltage signal is at
0 VDC or when the no reset signal is connected.
Kp = the proportional constant value for the PID loop. This
value affects the process stability of the PID loop.
Ki = the Integral constant value of the PID loop. This value is
used to eliminate positioning error on the PID loop.
Mod-Heat Controller
MAX Setpoint: xxx°F
MIN Setpoint: xxx°F
Controller Setpoints
Proportional. Kp: xx
Integral......Ki: xx
Controller Setpoints
Derivative Kd.: xxx
Unwind Signal..:xxx
Kd = The derivative constant value of the PID loop. This value is
used to change the anticipation function on the PID loop.
The Integral Unwind value accounts for non-linear effects and
limitations in the valve.