For district heating, two water supply pumps can be installed in the water supply system to meet the requirements. The operating state of the makeup pump is determined by the PLC based on the pressure deviation. Under normal circumstances, the PLC performs timing switching control on the two make-up pumps. When one fails, let the other run. To be on the safe side, a drain valve is also provided to open the drain when the pressure is too high. After the whole system is powered on, the PLC first detects whether its various parts are faulty and whether its peripheral system is faulty. If not, C initializes all the outputs and internal relay data through the program.
If the pressure of the pipe network is less than the set pressure, the PLC sends an incremental step acceleration signal to the inverter through the analog output, so that the motor starts to accelerate. The speed of the acceleration signal is determined by the set pressure value and the detection tube. The magnitude of the difference in the net pressure value. When the pipe network pressure reaches 90% of the specified pressure value, the PLC then controls the output of the analog quantity to give a decreasing step signal to decelerate the motor. When the pipe network pressure reaches the specified pressure, the inverter gives a stop signal. Let the motor brake to stop.
As the water temperature rises, the pressure of the pipe network rises, and when the pressure value of the pipe network is exceeded, the drain valve is opened, and when the pipe network pressure value is equal to the set pressure value, the drain valve is closed. Of course, this situation should be avoided as much as possible. The display part is used to display the set pressure and the detected pressure value. The sampled value is converted into a digital signal by the decoding program, and then the digital output module of the PLC directly controls the display of the seven-segment digital tube. Diagnose the fault phenomenon such as overload of the motor, excessive pressure, damage of the inverter, and then output an alarm signal. When the fault is not serious, some devices work or start the standby device; when the fault is serious, the whole system is stopped.
The heating system uses the PLC to control the frequency converter to maintain the constant pressure of the pipe network, which not only eliminates the expansion water tank, but also improves the heating quality, reduces the electrical and mechanical impact, and prolongs the working life. In addition, the user can set different working modes and expand the system according to the situation of the pipe network.
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