Mitsubishi Electric MELSEC iQ-R Series User Manual page 35

Heating-cooling control
The set value (SV) is set at a point where the manipulated value for heating (MVh)/manipulated value for cooling (MVc) is 0%.
Thus, as long as the temperature process value (PV) and the set value (SV) are not balanced at 0% of the manipulated value
for heating (MVh)/manipulated value for cooling (MVc), an offset (remaining deviation) is generated. When an offset is
generated, the heating proportional band (Ph)/cooling proportional band (Pc) can be manually shifted by the amount of the
offset (remaining deviation).
Ex.
When using the manual reset function in the following conditions
• Control method: P control
• 'CH1 Manual reset amount setting' (Un\G517): 800 (80%)
The temperature control module shifts the manipulated value (MV) in a stable condition at the set value (SV) from 0% to 80%.
Heating proportional
(Percentage to the full scale)
100%
Heating: 100%
80%
Manipulated value
for heating (MVh)
0%
Manipulated value
for cooling (MVc)
-100%
Setting method
Set a value in the following buffer memory area.
'CH1 Manual reset amount setting' (Un\G517) (Page 274 CH1 Manual reset amount setting)
Overlap/dead band
Cooling proportional
band (Ph)
(Percentage to the full scale)
Heating
Manual reset
The manipulated
value for heating (MVh)
can be moved from 0%
to 80% to keep
the set value (SV) stable.
Heating: 0%
Cooling: 0%
Set value (SV)
Manual reset range: -100.0 to 100.0% (every 0.1%)
(Set -1000 to 1000)
Input range
band (Pc)
Cooling
Cooling: 100%
Configure the settings
as follows:
Integral time (I): 0
Derivative time (D): 0
1 FUNCTIONS
1.7 Manual Reset Function
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