pmg511en21p01 13
5.5 CONTROL OUTPUT
Output modes for general temperature control include heating mode or cooling mode and heating and cooling mode.
Heating control and cooling control are opposite operations with inverted outputs. The
PID
time constant varies de-
pending on the characteristics of the section controlled during
PID control
.
The value of the control output is
MV
(Manipulated Variable).
MV
is a percentage value that controls the switching of the assigned device output
according to the settings.
0%
Heating control (inverted operation)
PV
Control output
(MV)
100.0%
0%
Cooling control (normal operation)
PV
Control output
(MV)
100.0%
Setting group
Parameter
Range
Default
PAR3
O-FT
Standard model: HEAT / COOL
HEAT
Heating/cooling model: HEAT / COOL / H-C
H-C
5.5.1 Heating Control
[PAR3 → O-FT → HEAT]
or Cooling Control
[PAR3→ O-FT → COOL]
Heating control mode: If the Process Value
(PV)
falls below the Set Value
(SV)
, the output will power the heater.
Cooling Control Mode: If the Process Value
(PV)
rises above the Set Value
(SV)
, the output will power the cooler.
5.5.2 Heating & Cooling Control
[PAR3 → O-FT → H-C]
Heating and cooling control mode: heating and cooling with a single temperature controller if it is difficult to cont-
rol the temperature of the object by heating or cooling alone. The heating and cooling control mode uses different
PID time constants to control heating and cooling. It is possible to set the heating and cooling control in both
PID
control and
ON / OFF
control modes.
For heating and cooling control, the relay control output
OUT1
is assigned to the heating control, and the SSR
/ current control output
OUT2
is assigned to the cooling control. Note that the
OUT2
SSR drive output uses
standard
(on / off)
control.
Cooling load
Heating load
Temperature drop
Temperature
increase
Temperature sensor input
(feedback)
Cooling control output
Temperature
controller
Cooling
control
Heating
control
Heating control output