Nor-Cal SDC15 Controller - Manual (Page 65)

5-15
• When the control method is other than the ON/OFF control (CtrL ≠ 0), the
display and setting can be made.
• [(Cool)] related items can be displayed and set when using the Heat/Cool control
(C26 = 1).
• When the I (Integral time) (I-1) is set at “0s” or I (Integral time) (cool) (I-1.C) is
set at “0s” in the Heat/Cool control, no integration control action is performed.
The Manual reset (rE-1) can be used in both the heat and cool controls.
• Parameter settings for the cool control are displayed only when the Heat/Cool
control is set enabled.
• The Manual reset (rE-1) is displayed when the set value of either the I (Integral
time) (heat) or (cool) becomes "0".
• The Manual reset (rE-1) is commonly used for both the heat and cool controls.
• When the I (Integral time) (heat) or (cool) is "0s", the operation is processed with
both I (Integral time) (heat) and (cool) set at "0s".
■ Heat/Cool control
The Heat/Cool control related items, such as Heat/Cool, Heat/Cool control dead
zone, and Heat/Cool change point can be set.
The following shows the Heat/Cool control calculation:
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
Item (Setting display/bank) Display Contents Initial value User level
Heat/Cool
(Setup setting/Setup bank) 0: Normal
1: Energy saving 0 Standard,
High function
Heat/Cool control dead
zone
(Setup setting/Setup bank) 0.0% Simple,
Standard,
High function -100.0 to +100.0%
Heat/Cool change point
(Setup setting/Setup bank) 50.0% High function -10.0 to +110.0%
PID (heat) PID (cool)
Heat/cool
change
point
PID control
(Fixed at
reverse action)
PID (heat)
Constants oL, oH
PID (cool)
Constants oL, oH
Heat/Cool output
calculation
Heat/Cool control dead zone
Heat/Cool control change point
Constants P, I, d, rE
Heat MV
Cool MV
PV
SP MV
(PID control result)