Agilent 4352B Combined Motor Control Module

The software design of the Agilent 4352B system includes the program design of the plc and the functional parameter setting of the inverter. The program design of plc is mainly discussed here. The program design includes manual control and automatic control program design. The manual part is to control the motor to run and stop under the industrial frequency through the button, which is mainly considered for the debugging or maintenance of the system.

Agilent 4352B selector switch to “automatic”, the system can enter the automatic working state, by plc and inverter joint control of the motor input or removal, frequency or frequency operation. The water supply system has 3 sets of pump motors, according to the water pressure to decide to put the number of pumps, only the initial input of the motor for frequency conversion speed control, the other after the input of the motor is running at full speed under the frequency, the switching process of the pump motors by the logic control unit plc to realize.

Agilent 4352B select p1 pumps for frequency conversion pumps, p2, p3 pumps for industrial frequency pumps plc state transfer diagram. Assuming that the order of pump increase is p1, p3 and p2, when the water supply equipment begins to work, the first start variable frequency pump p1, when the water pressure of the pipe network reaches the set value, the output frequency of the frequency converter is stabilized at a certain value. When the water consumption increases, the water pressure decreases, the pressure transmitter to the water pipe outlet changes the actual pressure signal of the main pipe into a 4 ~ 20 ma standard signal sent to the intelligent pid regulator, pid loop regulator by operation, the resulting adjustment parameters sent to the inverter, so that the frequency converter output frequency rises, the speed of the water pump to increase, the water pressure rises.