Mitsubishi Electric MELSEC iQ-R Series User Manual page 32

Dead band
The dead band refers to the temperature area where neither heating control output nor cooling control output is executed.
When the temperature process value (PV) is stable within this area, output is not executed for a slight change in the
temperature, resulting in energy saving.
Ex.
When the following values have been set:
• "Input range setting" of "Control basic parameters" in "Application Setting": 38 (Temperature measuring range: -200.0 to
400.0)
• "Target Value(SV) Setting" of "Control basic parameters" in "Application Setting": 200.0
• "Overlap/dead band setting" of "Heating/cooling control setting" in "Application Setting": 15.0
The range of 200.0 to 215.0 is the dead band area.
The temperature where a cooling operation starts = (Set value (SV)) + 15.0 = 215.0
As shown below, shifting the temperature where a cooling operation starts to the lower temperature side of the set value (SV)
produces a dead band area. (The following is an example of when the module is in P control.)
(manipulated value for cooling (MVc): 0%)
100%
0%
-100%
In the Q compatible mode, set 2.5% for "Overlap/dead band setting" of "Heating/cooling control setting" in
"Application Setting." (400 - (-200))  0.025 = 15
1 FUNCTIONS
30
1.6 Overlap/dead Band Function
Heating only
Heating
Set value (SV) is 200.0 .
Manipulated value
for heating (MVh): 0%
Manipulated value
for cooling (MVc): 0%
(manipulated value for heating (MVh): 0%)
Cooling starts at 215.0
Cooling only
.
Temperature
process value (PV)
Cooling