Azbil C15

5-11
Chapter 5. SETTINGS BEFORE STARTING OPERATION
C28: The following shows the relationship among the MV (manipulated variable)
in the heat/cool control dead zone, MV (manipulated variable) (heat), and
MV (manipulated variable) (cool).
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 %
For details, refer to Single Loop Controller Model C15 User's Manual "Installation & Congurations"
(CP-SP-1148E 13th edition or later)
100.0 % MV
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] is set at [0: Disabled],
[C28] is not displayed.