NIVELCO UNICONT PMG-500, User And Programming Manual, Page: 17 / 41

pmg511en21p01 17
Heating control
Cooling control
Cooling control Heating control
ON/OFF heating control and PID cooling control
ON/OFF heating control and ON/OFF cooling control
When db
is in 0 digits
When db is
in 0 digits
Control output MV
Control output MV
Heating hysteresis/offset
Heating hysteresis/offset
100.0%
OFF 0.0% (SV)
OFF (SV)
ON
ON ON
Process value Cooling MV
Present value
Cooling proportional band
Cooling hysteresis/offset
Note: Actual operation may differ depending on the set value of the heating integration time [H-I] and the cooling
integration time [C-I].
5.5.4 MV Upper Limit Value [PAR2 → H-MV] and MV Lower Limit Value [PAR2 → L-MV]
The upper / lower limits of the control output MV [H-MV / L-MV] can be set to the actual MV , provided that the MV
calculation of the temperature controller exceeds the limits.
When controlling heating and cooling, the cooling
MV
contains a „ - ” prefix. Therefore, the upper limit displayed on
the heating side is + , and the lower limit is displayed on the cooling side.
Standard control (heating) Heating and cooling control
100%
MV upper limit
Control output
MV lower limit
0%
100%
MV upper limit
Control output
MV lower limit
0%
Heating control Heating control
Cooling control
PV
Parameter Description / Range Default
H-MV
Standard control: MV lower limit value [L-MV] +0.1…100.0 100.0%
Heating and cooling control: 000.0…100.0 (PID)
0.0 (OFF)/100.0 (ON) (ON/OFF)
100.0%
L-MV
Standard control: 000.0…MV upper limit value [H-MV] –0.1 0.0%
Heating and cooling control: –100.0…000.0 (PID), –100.0 (ON) / 0.0 (OFF) (ON/OFF) –100.0%