EMKO ESM-3710 - Working Graphics of Esm-3710 Temperature Controller

4.4 Working Graphics of ESM-3710 Temperature Controller
1-If Operating Type Parameter Value = 1 (Cooling),
Switch On Delay After Power On Parameter Value ³ 1 ,
Compressor Stop/Start Time Delay Parameter Value ³ 1 and
Compressor Start/Start Time Delay Parameter Value ³ 1;
Power
Time
Hst
SET
Time
Output
Time
Time
Output
Led
°C
ON
OFF
Temperature
Value
Temperature Control Output
SET
HSt
Time
HSt HSt
Time
2-If Operating Type Parameter Value = 0 (Heating),
i
22
In ON/OFF control algorithm, temperature value is tried to keep equal to set
value by opening or closing the last control element. ON/OFF controlled system,
temperature value oscillates continuously. Temperature value’s oscillation period or
amplitude around set value changes according to controlled system. For reducing
oscillation period of temperature value, a threshold zone is formed below or around
set value and this zone is named hysteresis. Action of control output is described with
figures above.