GIC 151A12B, Instructions Manual

Page: 12 / 47

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12.1 ON/OFF CONTROL:
All the parameters regarding ON/OFF control are listed in group “rEg”. This type of
control can be set by programming par. “cont”= onFs for ON-OFF action with symmetric
hysteresis OR onFA for ON-OFF action with asymmetric hysteresis. It drives the output
programmed as coP [selected by par. oPcF#
5, 6, 7, 8
in oP], depending on the measured
temperature value, on effective set point, function mode (“func”) and on the hysteresis
(“hEst”).
The action can be explained as follows:
In case of reverse action i.e. HEAT being set on par. “Func” in “rEg” menu, the controller
activates the output when the process value “Pv” goes below [sP-hEst]. It de-activates
the output when the “Pv” goes above [“sP+hEst”] in case of symmetric ON-OFF control
and above “sP” in case of Asymmetric ON-OFF control. Similarly in case of direct action
i.e.
COOL being set on par. “Func”, the controller activates the output when the process
value “Pv” goes above (sP+hEsT) and deactivates the output when “PV” goes below
“SP-hEST” in case of symmetric ON-OFF control and “sP” in case of Asymmetric ON-
OFF control.
12.2 Neutral Zone ON/OFF Control (nr):
12.2.1 Action:
All the parameters referring to neutral zone ON/OFF control are listed in the group "rEg".
This type of control can be set when two outputs, configured by parameter “oPcf”
(“oPcF” = h1c2 configures oP1 as heater and oP2 as compressor) are programmed as
“coP” and the par. "cont” = nr. The neutral zone control is used to control processes in
which there is an element which causes a positive increase in temperature (eg. Heater,
Humidifier etc.) And an element which causes decrease in temperature (e.g. Cooler, de-
humidifier, etc.) Depending on measurements of effective set point "sP" and on