NIVELCO UNICONT PMG-400 User And Programming Manual
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14 / 24 pmg4111a0600p_01To change the control parameters, press the button and hold for 3 seconds in normal(measurement) mode. If the configuration is completed press the button and hold for 3seconds to return to normal (measurement) mode.The , , , , , , , , parameters will be displayed only if thecorresponding options are selected at the operating modes.8. CONTROL ALGORITHMS8.1 ON/OFF CONTROLThe ON/OFF control is called two-position control because the output turns ON when the PV falls lowerthen SV and the output turns OFF when the PV is higher than SV. This control method is not only forcontrolling temperature it can be also used for basic control method for sequence control or level control. The ON/OFF control is operating when the value of Proportional band () is set to . at the controlparameters. If necessary, a programmable temperature difference () between ON and OFF can be set at thecontrol parameters. The setting range is 1 °C to 100 °C (or 0.1 °C and 100.0 °C). If the hysteresis widthis too small, too frequent relay switching may occur (contact bounce). The menu item is available at the control settings only if is set to . at the control parameters. The ON/OFF control mode should not be applied when this type of control method may cause damage tothe equipment due to the potentially too frequent ON or OFF cycle (such as cooling compressors). Even if ON/OFF control is stable contact bounce can be occurred in the following cases: not sufficient value, the capacity of the heating system, the response characteristics of the equipment to becontrolled, or mounting position of the sensor. These aspects should be taken into account to minimizeto possibility of contact bounce when designing the control system.8.2 H EATING / C OOLING (FILLING / E MPTYING) CONTROLThe device can control heating or cooling process but also suitable for tank level control tasks. The fillingcontrol algorithm is the same as the heating, while the emptying control algorithm is the same as thecooling.The algorithm can be selected at the mode settings menu. function: cooling, or emptying control function: heating, or filling controlCooling / emptying Heating / fillingtPVYtPVYPV: process value Y: intervening signal |
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