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Failure and maintenance of fish tank variable frequency water pump controller

Apr 07, 2021

Failure and maintenance of fish tank variable frequency water pump controller

The fault diagnosis method for the maintenance of the fish tank variable frequency water pump controller requires that the possible faults of the system or equipment should be listed first, and then the direct causes of each fault include hardware, environment, human factors, etc., and use appropriate logic to connect them to the fault To form a fault diagnosis tree. When diagnosing, check the tree from bottom to top step by step until the fault is found. When there are many faults, this method is convenient and quick to diagnose. Start inspection from the base of each branch until you find out the nature, cause, and location of the fault. When a fault is found, the fault phenomenon still exists, indicating that there are other faults, and it is necessary to check and test again until the faults are all found out.



Failure and maintenance of fish tank variable frequency water pump controller

The automatic diagnosis of the fish tank variable frequency water pump controller can only find out the nature and location of the fault, but the cause is not easy to find. Sometimes the self-diagnosis is misleading, so manual diagnosis is required. At this time, it is necessary to list the faults that may cause this information according to the automatic diagnosis information, and then check the suspected points one by one, narrow the scope, and finally find out the cause and location.


Mainly refers to the comparison of phenomena, such as cutting off a certain part of the circuit, replacing a certain component, comparing whether the phenomena are the same as cutting and not cutting, replacing and not replacing. If the phenomena are the same, the fault still exists and the cause of the fault has nothing to do with the original circuit and component. If the fault disappears, it means that the root cause of the fault is from this circuit or component. This method is commonly used in inverters of the same model.



Failure and maintenance of fish tank variable frequency water pump controller

Sharing of fault diagnosis methods for maintenance of fish tank variable frequency water pump controller


1. Example of DC overvoltage fault diagnosis for fish tank variable frequency water pump controller


① The grid voltage connected to the fish tank variable frequency pump controller exceeds the rated range, so the DC voltage after rectification is higher than the allowable value.


②The deceleration time of the water pump motor is set too short and the deceleration is too fast. The feedback energy causes the voltage charged by the filter capacitor to increase rapidly, forming a high voltage.


③The braking resistor connected in parallel with the filter is not connected. It cannot consume feedback power, and has no effect on suppressing the voltage of the water pump. The voltage on the capacitor is higher than the allowable value. Check and test one by one after listing the doubts. During the inspection, first check whether the deceleration time setting is normal. If it is normal, enter the next doubtful point. Use a voltmeter to measure the power supply voltage. If it is normal, check whether the braking resistor is connected. Check the test according to the above steps, and found that the switch connected to the braking resistor cannot be closed.



Failure and maintenance of fish tank variable frequency water pump controller

Common faults in the use of fish tank variable-frequency water pump controllers are classified into the following categories: 1. Status failure; 2. Hardware failure; 3. System failure; 4. Communication failure; 5. Power failure monitoring.


As a common inverter accessory product, the terminal block can also affect the output efficiency of the inverter due to the difference in its connection performance. Now the common situations in which inverter products cannot be used due to the problems of the terminals themselves are listed and explained, presenting you with the most comprehensive solution to inverter terminal problems. First of all, we should learn more about the causes of inverter failures?


1. Status fault: DC over/long voltage, DC over current, AC over current, excessive speed deviation, ground fault, lack of equalization.


2. Hardware failure: current board failure, trigger board failure, IGBT failure, pulse generator failure, etc.


3. System failure: Watchdog failure, abnormal system parameter, clock failure, etc.


4. Communication failure: TIMEOUT, OVERRUN, etc.


5. Power failure: alarm when the control power supply is too high or too low.



Failure and maintenance of fish tank variable frequency water pump controller

Problem analysis of repairing fish tank variable frequency water pump controller wiring terminal


Detailed explanation of the cause and solution of the terminal failure of the fish tank variable frequency water pump controller


1. Check whether the short link between the "+24V" and "PLC" terminals is connected? Is there a misplaced connection (connected to another terminal)?


2. Use a wire to short-circuit the X1--X7 and COM terminals, and check the parameters of U0-18 to see if the corresponding terminal input is active;


If there is no change in only one piece, it can basically be judged that this terminal is damaged, and other pieces can be used for debugging.


3. Check whether there is 24VDC between the "+24V" and "COM" terminals. Use a multimeter to measure the DC range. There should be 24V voltage. If the voltage between "+24V" and "COM" is normal, then perform the following inspection, otherwise it can basically be judged that there is a problem on the control board;


4. Is the shorting link between the "+24V" and "PLC" terminals tightened? If the shorting link is dropped or not tightened, the X1--X7 terminals will be invalid, especially when the inverter's "+24V" power supply is used externally, be sure to tighten both screws, because the shorting link is connected to two If only one terminal is tightened, the shorting bar will not fall off, but the "+24V" terminal and the "PLC" terminal may not be connected, and the X1--X7 terminal input will also be invalid.


5. If the above detection is correct and the terminal does not operate, you need to check the parameter settings. Are the parameters such as B1-00=1 and C0-01=3 set correctly?