With the development of power technology, the frequency conversion speed regulation technology is becoming more and more sophisticated. The intelligent water supply control system with the principle of variable frequency speed control has replaced the water supply equipment such as high water tanks and pressure tanks in the past. The start is smooth, and the starting current can be limited within the rated current. This avoids the impact on the grid at start-up; as the average speed of the pump is reduced, the useful life of the pump and valves can be extended; the water hammer effect at start and stop can be eliminated. Its stable and safe operating performance, simple and convenient operation methods, and complete and thoughtful functions will enable water supply to save water, save electricity, save manpower, and ultimately achieve high-efficiency operation. The constant pressure water supply speed control system realizes the stepless speed regulation of the water pump motor, automatically adjusts the operating parameters of the system according to the change of the water consumption (actually, the pressure change of the water supply pipe network), and maintains the constant water pressure to satisfy the water when the water consumption changes. The requirements are today's advanced and reasonable energy-saving water supply systems. Beijing Fulai Times Technology Co., Ltd., as a professional manufacturer of constant pressure water supply controllers, considers the market and customers, and has developed DB-2000, DB-2100 series constant pressure water supply controllers, which are widely used in constant pressure water supply systems. application.
This article takes the DB-2000 and DB-2100 series constant pressure water supply controllers produced by Beijing Fuller Times Technology Co., Ltd. as an example to introduce some of our experience in water network reconstruction.
Second, DB-2100 series constant pressure water supply controller application mode:
Usually, multiple common pumps are set in the same water supply system. When the water supply volume is large, multiple pumps are fully opened, and when the water supply volume is small, one or two pumps are opened.
When using constant-voltage water supply for variable frequency speed regulation, two methods are used:
The first is that each pump is equipped with a frequency converter;
The second is that all pumps are only equipped with a frequency converter and a constant pressure water supply controller.
Obviously the first method is too costly; the second method is very low cost. The DB-2000 and DB-2100 series constant pressure water supply controller developed by Beijing Fulai Times Technology Co., Ltd. can easily realize the function of one inverter to control any number of motors. The principles described below are all systems that use a single drive to drive multiple motors.
System structure: The inverter and DB-2100 constant pressure water supply controller constitute a control system to optimize the control of the pump group's speed control operation, and automatically adjust the number of pump units to complete the water supply pressure closed-loop control, in the network flow When the change changes, the purpose of stabilizing the water supply pressure and saving electric energy is achieved.
Third, the working principle description
When the constant pressure water supply system composed of the inverter and DB-2100 controller is put into automatic operation, the 1# pump motor contactor is first controlled to conduct, the inverter output frequency increases, and the pipe network pressure signal gradually increases, the outlet pipe The network pressure signal and the controller network pressure setting signal negative feedback closed loop. When the motor frequency rises to the highest frequency and the pipe network pressure fails to meet the set requirements, the inverter immediately controls the power frequency to connect the 1# pump. The 1# pump is put into operation at full speed, and the inverter is time-delayed. The 2# pump is frequency-controlled, and the 3#, 4#, and 5# pumps repeat this process. When the pipe network pressure and the controller set pressure are basically balanced, the inverter controls the current variable frequency motor to maintain a certain frequency. When the water demand decreases, the pipe network pressure gradually increases, and the output frequency of the internal PI controller decreases. When the inverter output frequency is lower than the lower limit of the pipe network (factory default is 20HZ), the pipe network is higher in the set time. In setting the pressure, the frequency converter cuts off the first power frequency control pump (following the principle of “start first and stop firstâ€), and then controls the next original frequency control pump. The frequency converter rotates gradually during the control conversion process of the water pump. The water pump makes the utilization of each pump even and increases system reliability.
IV. Use of DB-2100 Series Constant Pressure Water Supply Controller
4.1 Preliminary parameter settings
(1) Determine the pump attribute group parameters (C-18 to C-23).
(2) If you need the running time chart, you can fill in the running time chart group (C-29 ~ C-46), first adjust the clock (C-29), then determine the number of running charts (C-30) and fill in the start time And the corresponding state. The factory setting is the time chart of 8 steps to distinguish between high and low peak water use (differentiated by first and second pressures) and night shutdown (if there is a small pump attached, then only a small pump is running). The start time should be ranked from small to large. For example, there are only 2 segments of the running time graph. If 0:00 to 5:30 turns off, C-31=0.00, C-32=0, and C-33=5.30 If 23:59 to 5:30 turn off, C-31=5.30, C-33=23.59, and C-34=0.
(3) Determine the inverter attribute group parameters (C-14 to C-17).
(4) Determine the dormancy parameters (C-24 to C-28), timing pump change parameters (C-47 to C-49), and fire control parameters (C-58 to -63).
4.2 Parameter Correction in Manual State
(1) Correct the parameters of the remote pressure gauge (C-12～C-13). When the pressure gauge indicates zero, adjust Pb to make the feedback pressure display zero; increase the water pressure (reach 1/3 of the full scale) Adjust Pg so that the feedback pressure is actually displayed.
(2) Correct the lower limit frequency (C-05) of the pump. This frequency is the critical frequency for the single pump not to discharge water.
4.3 Parameter Correction in Automatic State
(1) AC drive acceleration/deceleration time (C-15) parameters directly affect the performance of the controller. If the inverter's actual frequency lags behind the controller's given frequency in the automatic operation status, adjust parameter C-15 to ensure synchronization.
(2) If the pump switching condition is set by the user (ie, C-06 = 1), the duration of the upper and lower limit frequencies should be properly reduced to ensure that the system does not oscillate.
4.4 With multiple pumps
When configured as a standard direct start and stop type, it can constitute a variable pump + 5 quantitative main pumps, or a variable pump + 4 quantitative main pumps + 1 auxiliary small pump domestic water control system.
When it is configured as a standard cycle soft start-stop type, it can constitute a domestic water control system with 5 variable main pumps or 4 variable pumps + 1 auxiliary small pump.
When it is configured as a fire-fighting type, it can constitute a fire-fighting or fire-fighting common control system with a 4-pump cycle soft start or direct start. Each pump (C-19 ~ C-23) can be used as a main pump, C-23 (ie, 5 # pump) can be used as a subsidiary pump.
4.5 Additional features of fire protection function
The mode of operation of the regulated pump group (or life pump group) and the fire pump group, and the inspection mode of the fire pump are selected through the application of macros (C-18). When selected as the fire protection function, it is B5, and the output point of D5 cannot be connected to the main pump. , so the maximum number of main pumps is 4.
There are two ways to stimulate the fire state. When fire or fire through the FIRE terminal, the software fire protection function (C-62=1). When all the regulated pumps are operated to the maximum working condition, the pressure still cannot reach the set pressure. Add the pump to enter the fire state after a delay. This function is usually only used in fire-fighting systems. After entering the fire state, the Fire indicator light is on in the automatic mode. For fire through the FIRE terminal trigger or select the software to enter the fire state, exit the fire state can only be re-powered; for entering the fire state through the FIRE terminal level mode If the level of FIRE terminal is invalid, it will automatically exit the fire state.
For fire-fighting types that are regulated by the main pump (Fire B, C type), B5 can be selected as an auxiliary small pump. In the non-fire state, the regulated pump can change the pump periodically, and can choose to sleep. When sleeping, the B5 affiliated small pump can choose to work in the frequency or frequency conversion. These types of firefighting can well meet the life fire sharing system.
For fire-fighting types with a small pump regulated (firefighting A, E type), the B5 regulated small pump can be selected to operate at either power frequency or variable frequency. These firefighting types are used only for firefighting-only systems.
V. Comparison of Application of DB2100 Constant Voltage Controller System and PLC Constant Voltage Controller System
DB-2100 water supply controllers and PLCs are all industrial control products. At the beginning of design, various complex industrial and mining environments are considered. Therefore, the key components are selected from internationally renowned branded devices, so they are stable and reliable. Both sexes are on a horizontal line.
In the use of constant pressure water supply control system composed of frequency converter and DB-2100 water supply controller, because of the built-in PID function, the use of simple and convenient, the operator can debug the system in a very short time. Inverter-PLC combination requires programmers to write according to their own experience, reliability and stability have yet to be verified.
Since the DB-2100 water supply controller is a standard product, if there is a problem, it can be directly replaced. If a problem arises in the PLC, another PLC must be purchased and a professional programmer is required to program it. This is troublesome in the water network reconstruction and maintenance. Therefore, in the use of cost, post-maintenance, inverter plus DB-2100 combination better.
Sixth, other matters needing attention in water supply application
(1) When the frequency conversion pump is switched to the power frequency control, it can be switched directly to prevent the pipe network pressure from fluctuating. The switching time of the frequency conversion control of the industrial frequency pump must be properly set, and the extension should be too short. The pump will form an impulse voltage and an inrush current to the inverter, making it easy to make Inverter failure, long delay makes the pressure in the pipe network unstable, and thus frequent frequent switching action.
(2) When the distance between the water supply board and the main control board is long (more than 20m), additional power supply must be provided to ensure the correct transmission of the signal.
(3) The PLC control function can be simplified when the water supply system does not need to handle water supply problems in emergency situations such as fire fighting. Even a simple constant-voltage water supply is achieved by a single inverter.
(4) Appropriate use of the inverter's unique load detection and shutdown self-stop function to facilitate remote pump control.
(5) When wiring the inverter control signal, separate it from the power line and do not install it in the same wiring harness. Otherwise, malfunction may occur.
(6) Shielded wire must be used for pressure setting signal line and pressure feedback signal line.
(7) AC contactor with mechanical interlocking device shall be used between the power frequency bypass of the motor side and the inverter output, and be logically interlocked on the electrical control loop to prevent the power frequency from being output between the power supply and the inverter output. Causes a short circuit that damages the inverter and related equipment.
(8) The phase sequence of the power frequency power supply connected to the motor should be consistent with the phase sequence output from the inverter. To prevent the motor from reversing the accident, check the phase sequence.
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