SOLO Basic Temperature Controller User Manual
5–3
Chapter 5: Control Modes
1st Ed. 02/19
On / Off Control
In the On / Off control mode the output is controlled according to the difference
between the SV and the PV. If the PV is lower than the SV and the output is set
for heating, the heating output is turned on. If the PV is higher than the SV and
the output is set for cooling, the cooling output is turned on. Hysteresis can be
used to avoid output chatter and when in dual output mode Deadband will help
prevent bouncing between heating and cooling.
OFF
PV
Set point
ON
Heating
Dead band
Output 2 Hysteresis
Cooling
o1-s 02-s
dead
Dual loop ON / OFF control output operation
Hysteresis
If heating, this is the value below the set temperature that the PV must fall
to before the output will turn on. If cooling, this is the value above the set
temperature that the PV must rise to before the output will turn on.
Deadband
The range around the PV in which the heating/cooling outputs remain off. A
negative deadband has the opposite effect allowing both outputs to be on in the
area around the PV.
Manual Control
In the Manual control, the output of the controller is manipulated manually by
the operator. Adjust the values of the Output Level parameters (
out1
,
out2
)
to control the output levels.
Error Display Information
The chart below illustrates the possible error displays shown on the SOLO Basic
Temperature controller.
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