Azbil SDC15 - Page 55

5-11
C28: The following shows the relationship among the MV (manipulated variable)
in the heat/cool control dead band, MV (manipulated variable) (heat), and
MV (manipulated variable) (cool).
Handling Precautions
• When the parameter setting [Ctrl: Control method] is set at [0:
ON/OFF control], [C28] is not displayed.
• When the control output is one point and the event output is not used,
[C28] is not displayed.
• When the setup setting [C26: Heat/Cool control selection] is set at [0:
Disabled], [C28] is not displayed.
Chapter 5. SETTINGS BEFORE STARTING OPERATION
100.0%
0.0%
Heat MV
100.0%
Cool MV
0.0%
0.0% 50.0% 100.0% MV
100.0%
0.0%
Heat MV
100.0%
Cool MV
0.0%
0.0% 50.0%
Deadband
Figure 2.
Deadband > 0.0 %
Heat/cool control change point = 50.0 %
Figure 4.
Deadband = 0.0 %
Heat/cool control change point = 75.0 %
Figure 1.
Deadband = 0.0 %
Heat/cool control change point = 50.0 %
100.0% MV
33.3%
0.0%
Heat MV
100.0%
Cool MV
0.0%
0.0% 75.0% 100.0% MV
100.0%
0.0%
Heat MV
100.0%
Cool MV
0.0%
0.0% 50.0%
Absolute value
of the deadband
Figure 3.
Deadband < 0.0 %
Heat/cool control change point = 50.0 %
SDC15 Single Loop Controller User's Manual for Installation & Configuration,
No. CP-SP-1148E (13th edition or later)
100.0% MV