1. The pressure of Delixi inverter system is unstable and easy to vibrate?
Answer: The pressure of the system is unstable, which may be due to the following reasons:
A. There is a problem with the direction of the pressure of the pressure sensor acquisition system, and the pressure collection point is too close to the water outlet of the water pump, and the pressure of the pipeline is too affected by the water output speed. The pressure value fed back to the controller then rises and falls, forming the vibration of the system.
B. In addition, if the system adopts the method of a pressure tank, and the pressure collection point is selected on the pressure tank, the vibration of the system may also be formed. Because the air itself has a certain elasticity, and the solubility of the gas in the water changes due to the change of the pressure, there is a certain time difference between the water pumped out and the pressure transmitted through the gas, and then the system vibrates.
C. The acceleration and deceleration time of the controller and the inverter do not match the power of the pump motor. In general, the higher the power, the longer the acceleration and deceleration time. For this parameter, the user can select several more data for experimentation. For example, 15KW is generally between 10 and 20 seconds.
2. Too frequent start and stop of small pumps?
Answer: In the system, the 11th parameter in the parameters of the controller, that is, the abort pressure difference of the small pump misses small. After all the main pumps are closed, the small pumps start when the actual pressure of the system is lower than the set pressure. As the pressure of the system rises, the actual pressure of the system is higher than the sum of the set pressure and the abort pressure error of the small pump, and the small pump is closed by the system. Therefore, the solution to the problem is to increase this parameter by increasing the required value.
3. The analog output is abnormal, and the operating frequency of the inverter is inconsistent with the output of the controller?
A: First of all, you should confirm what hardware is wrong. Make the controller enter the manual debugging state, and use a multimeter to measure the analog output values corresponding to the 0Hz and 50Hz output of the controller. If the analog output value of the controller is greater than 30mV at 0Hz, or less than the voltage value calibrated by parameter 5 of the controller at 50Hz, there is a problem with the output of the controller. Here are a few scenarios:
A. If the output has always remained unchanged with the change of the frequency of the controller, it is clear that the analog output circuit of the controller is damaged.
B. If the analog output value is also changed, but cannot reach the maximum value, it can be solved by adjusting the VR3 potentiometer in the small window of the controller.
Secondly, if the output value of the controller is normal, when the output of the controller reaches the maximum value, the inverter cannot reach 50Hz, which means that there is a problem with the set value of the inverter, and the frequency gain of the inverter can be adjusted.
4. When the pump is switched, the output of the inverter is not zero, why?
Answer: The user should confirm that the controller connects all the control wires of the inverter, and when the pump switches, the controller will give the inverter a gliding stop signal, that is, the EMG signal. Some users did not connect the EMG signal line, which directly led to the above situation. This kind of phenomenon should be prohibited, otherwise, it is easy to damage the inverter. If there is an EMG signal cable, double-check that the wiring is secure. After confirming that there is no line fault, use a multimeter to check whether the EMG of the controller has output. If there is no output of the EMG signal when the controller is switching, it is a problem with the controller.
5. How to connect the anti-disturbance wiring between the controller and the inverter?
Answer: In order to avoid the disturbance of the control signal lines of the controller and the inverter by the space electromagnetic field, the outer layer of these control signal lines can be connected with shielded wires to improve the anti-interference ability of the system. This kind of wiring must be noted, and only one point can be selected for the shielded connection address. Whether it's on the side of the controller, or on the side of the inverter. In this way, the anti-disturbance ability of the progressive system can be guaranteed. If the shield wire is grounded at both ends, the potential difference will occur on the shield wire, which will not only not improve the anti-interference ability of the system, but will aggravate the disturbance of the outside world to the controller.
6. How to solve the problem that the data of the controller is flying or the data is occasionally incorrect?
A: This situation is caused by severe disturbance of the manipulator. Often, the working environment of the controller is relatively harsh, and the disturbing signals come from many sources. After correcting the condition or parameters of the controller, the user must turn the black keyboard in the small window of the controller to determine the direction of the switch to LOCK. In this way, it not only prevents others from unconsciously correcting the parameters, but also ensures that the system data does not run away. If the data is occasionally abnormal, the controller can actively operate without stopping, and the system stability pressure has not changed, then the controller can take the initiative to read the original data back. If the controller is no longer working properly, the user can disconnect the power supply of the controller and turn it on again after a while, and the system will resume normal operation. If the user forgets to make sure that the keyboard determines the switch and sets the data to be overwritten, the user needs to set the system parameters from scratch. After the setting is completed, pay attention to the switch.
7. The contactor that controls the motor does not move, and the motor does not start?
Answer: First of all, check the output status of the controller reflected by the controller panel, and you can compare the setting and operation indication status of the 7 pumps on the panel described in the controller explanation book. If there is an output of the pump indication status on the panel corresponding to the non-action motor, the user should first check whether the external contactor wiring and the relay logic of the contactor are correct. If there is no problem, then use a multimeter to measure the output of the corresponding relay of the controller, if the relay does not output a closed switching signal, it is clear that there is a problem with the relay output of the controller. If the corresponding pump indicated on the panel also has no output indication, please check the parameter settings of the controller to check whether the corresponding pump is set to open (ON condition).
8. The pressure sensor shows the pressure change, but the panel shows the pressure unchanged?
Answer: First of all, you should check whether the wiring of the pressure sensor and the controller is loose or in poor contact. If the above phenomenon does not exist, the multimeter is used to measure the manipulator to simulate the voltage value of the inlet. First, measure the voltage value between the SV terminal and the GND terminal, if it is 5V, and clarify that the power supply providing the analog input port is normal, then proceed to the next step. A 10K ohm sliding resistor can be connected to the three terminals of the inlet of the controller, the dynamic termination is connected to P1, and then the voltage of the P1 terminal and the GND terminal of the controller is measured.
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