Red-lion TSC User Manual download pdf (Page 42)

Heat-Cool Overlap/Deadband (db-2)

This parameter defines the area in which both heating and cooling are active

(negative value) or the deadband area between the bands (positive value). The

parameter units are degrees or tenth’s of degrees (depending on system

resolution). If a heat/cool overlap is specified, the displayed percent output

power is the sum of the heat power (OP1) and the cool power (OP2).

db-2 - -999 to 9999

If cooling relative gain is zero, the cooling output operates in the ON/OFF

mode, with this parameter becoming the cooling output hysteresis (positive

value only). This parameter should be set prior to Auto-Tune with cooling.

The heat/cool operation figures illustrate the effects of different deadbands.

In practice with the cooling output, observe the controlled temperature

characteristics and if the temperature remains above setpoint with a sluggish

return, increase the cooling gain. Similarly, if the temperature drops too

sharply with an overall saw-tooth pattern, decrease the cooling gain. Alter the

heat-cool overlap until a smooth response in the controlled temperature is

observed during band transition.

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Red-lion TSC User Manual Page 42