In this plan, what use PLC to fulfil the following function in station of each heat exchange: Spot temperature, pressure, discharge, fluid the collection of signal; The spot the control of each control valve; The control of spot electric machinery, transducer reachs moving surveillance. In heat exchange station, finish through feeling what screen goes easily simply interactive, control all sorts of equipment stability to move. To spot control valve and the control of all sorts of electric machinery, designed local control, feeling to attemper screen control, remotely the center controls 3 kinds of fashion.
(1) is mixed 2 times according to temperature of the atmosphere outdoor of the net for backwater net water supply or backwater conduit electrify move average thermoregulation control valve, change a net to receive the flow of heat exchanger thereby, make sure the heat addition of the net is measured 2 times.
(2) basis of 2 temperature of the atmosphere outdoor, nets offer backwater temperature, for backwater pressure in all 5 parameter, will adjust the running frequency of circular water pump through transducer, change the moving discharge of the net 2 times thereby. (adopt this plan for frequency conversion pilot to water pump circulating in heat exchange station at present) .
(The actual measurement pressure that 3) nods according to constant voltage is worth what be worth with set pressure to compare deviation, will change the running frequency of filling water pump through transducer, the pressure that makes sure constant voltage is nodded is constant.
(4) among them, data of temperature of the atmosphere outdoor uses each the temperature outdoor adds new unit evacuation of processing of station of center of the classics after advantageous position is average transforms aircrew to undertake automata toward each.

Previous:no article
Next：By adjust medium parameter chooses valve