3BHB003688R0101 ABB PCB Circuit Board

3BHB003688R0101 ABB PCB Circuit Board

3BHB003688R0101 The system adopts Omron programmable controller SYSMAC CPM2A series, the number of I/O points is 60 points, and PLC programming adopts OMRON CX-Programmer, which is a 32-bit Windows software support tool for Omron PLC, providing a complete programming environment for offline programming and on-line connection and debugging. It provides a complete programming environment for offline programming and online connection and debugging, and can realize the mutual conversion of ladder diagram and statement table. In order to improve the cost-effectiveness of the whole system, the system adopts switching input/output to control motor start/stop, timing switching, soft start, cycle frequency conversion and fault alarm, etc., while the analog quantities, such as motor speed and water pressure, are controlled by the PID regulator and frequency converter.

3BHB003688R0101 switching diagram in Figure 2. at the beginning, if the hardware and software are not standby (both effective at the same time when the hardware is given priority), 1 # pump frequency conversion start, the speed from 0 with the frequency up, such as frequency converter frequency reaches 50Hz at this time the water pressure is still in the lower limit value, delay for a period of time (to avoid interference caused by the false action), 1 # pump switching to the operating frequency, while the frequency converter frequency from 50Hz to 50Hz, the water pressure is still in the lower limit value, delayed for a period of time (to avoid interference caused by false action), 1 # pump switching to the operating frequency. At the same time the frequency converter frequency from 50Hz slip stop to 0Hz, 2 # pump frequency start, such as water pressure is still not satisfied, then start 3 #, 4 # pumps in turn, the pump switching process as above; if the beginning of the 1 # pump standby, then the direct start 2 # frequency conversion, the rotation speed from 0 with the frequency up, such as the frequency converter frequency reaches 50Hz at this time the water pressure is still in the lower limit value, after a period of time delay, the 2 # pump switching to industrial frequency operation, the frequency converter frequency from 50Hz slip stop, the frequency converter frequency reaches 50Hz at this time the water pressure is still in the lower limit value, delay a period of time, the 2 # pump switching to frequency operation. At the same time the frequency converter frequency from 50Hz slip stop to 0Hz, 3 # pump frequency start, such as water pressure is still not satisfied, then start 4 # pump, pump switching process as above; if 1 #, 2 # pumps are standby, then the direct start 3 # variable frequency

3BHB003688R0101 frequency constant pressure water supply system in the water pressure is high, is usually used to stop the frequency conversion pump, and then the frequency converter to frequency operation switching to the frequency operation of the pump is running on the regulation. This way of switching is theoretically more advanced than the direct cut frequency, but it is easy to cause frequent starting and stopping of the pump group, thus reducing the service life of the equipment. In this system, the direct stopping of industrial frequency pumps, at the same time by the frequency converter quickly adjusted, as long as the parameters are set appropriately, you can realize the pumps without impact switching, so that the transition of the water pressure is smooth, effectively preventing a wide range of fluctuations in the water pressure and water pressure is too low when the phenomenon of a short period of shortage of water, improve the quality of water supply.