The filter chamber of the chamber Filter Press is composed of two adjacent concave filter plates, the main advantages are less loss when feeding, fast filtration speed, high temperature and high pressure resistance, good sealing performance, uniform washing of filter cake, low moisture content, high degree of automation, saving manpower and reducing operating costs, and the pressure of each filter chamber is uniform and not easy to break the plate, which is basically suitable for all solid-liquid separation industries. The electrical control part of the automatic Chamber filter press can be divided into three parts according to the use: the power supply part, the hydraulic system control part and the plate pulling system control part, which is aimed at the common electrical faults of the automatic chamber filter press

Analysis and treatment of main fault causes

Inverter alarm

Because the inverter is a device that controls the motor of the pull-up plate manipulator alone, the reason should be found from the relevant parts of the pull-up plate manipulator when the inverter alarms. When the power supply fails, the motor fails and the inverter itself fails, the inverter alarm fault can occur.

Solution: The inverter alarm information can be directly read according to the fault code of the panel, and then according to the prompt given by the alarm information, it can be searched to determine the cause of the fault and eliminate the fault. For example, if the fault code of the inverter is F0001, check the fault code of the inverter and show it as overcurrent, so that it can be judged that the overcurrent protection action of the inverter is in operation, and the analysis may be caused by the overload of the motor and load; After inspection, the motor, bearing and stator and rotor are not in good condition.

The pressure of the hold-down plate is insufficient or cannot be maintained

Since mechanical problems can also cause such failures, after eliminating the possibility of mechanical failures, if it is difficult to identify electrical problems, you can cooperate with mechanical professionals to find out the problems quickly by finding them.

Causes of insufficient pressure of the compression plate: the hydraulic pump motor is out of phase, the regulator is not in place or the adjustment is out of order.

Treatment: First, check whether the motor is in good condition and whether there is overheating operation; If the motor is damaged, the wiring and components of the motor terminals, cables, thermal relays, contactors and other parts should be checked one by one along the load return route of the motor until the cause of the fault is found, the fault is eliminated and the damaged motor is repaired. If no motor problem is found, the regulator should be considered intact; Causes of such failures due to regulator failures:

1. The rated pressure of the pressure regulator is improperly adjusted;

2. The adjustment bolt is screwed too tightly or the exhaust hole is blocked by foreign objects or the product is not selected properly;

3. The seal is damaged and the seal is not tight, or there is a foreign object between the valve mouth and the valve.

Solution(s):

1. Adjust the adjusting bolt of the pressure regulator (screw the bolt downward and increase the working pressure);

2. Check whether the bolts are adjusted too tightly and dredge the oil drain hole on the valve body;

3. ｒｅｐｌａｃｅ the seal of the oil drain valve or disassemble and ｒｅｐｌａｃｅ the valve plate of the oil drain valve.

Reasons for not being able to maintain pressure: the check valve is not closed tightly, the electrical contact pressure gauge is damaged or the contact resistance is too large and the related electrical components are damaged.

Solution: First of all, it should be confirmed that the pressure can not be maintained due to the fast pressure relief speed or the pressure is not automatically started after the pressure drops to the lower limit of the pressure gauge. In the former, the check valve should be considered to be closed loosely, the check valve should be dismantled and checked, whether the seal is blocked by foreign objects or the seal is damaged, if it is blocked by foreign bodies, the valve body can be thoroughly flushed, and all the foreign bodies can be discharged to eliminate the fault, if the valve body seal is damaged, the seal needs to be replaced or a new check valve. In the latter, the contact pressure gauge itself should be checked, and the contact resistance when the contact is closed and the pressure gauge itself, related intermediate relays, terminals, etc., should be checked in turn with tools, and the fault point should be found, and the relevant components should be repaired or replaced to eliminate the fault.

The control button operation is invalid

Because there is a certain concentration of acid gas, kerosene, alkaline dust, etc. in the environment where this equipment is used, it is more corrosive to the equipment, especially electrical components. When the operation of the control button is invalid, the structure and contact of the control button itself should be checked firstly. Check the method, press the corresponding button, observe whether the corresponding node indicator light at the PLC input end is lit, if it is lit, the button is not faulty, if it is not lit, the button, the relevant terminal wire, etc. are checked; When it is determined that there is no fault on the input side, you can continue to press the input button to observe whether there is a relevant indicator light on the PLC output terminal side, if there is an indicator light on, you should check whether the output-related intermediate relay, contactor and solenoid valve coil are in good condition; If there is no indicator light on, it means that the PLC does not meet the output conditions, and the relevant limit switch and proximity switch should be checked whether the relevant limit switch and proximity switch are in good condition, and whether the node opening and closing are correct, so as to find out the cause of the fault, make a correct judgment, and solve the problem in time.

Diagnosis and treatment of common electrical faults of chamber automatic filter press (Fig. 2)

Other fault causes and troubleshooting methods

1. Compression, no action on the return trip

Causes and elimination methods: compression, damage to the return travel switch (repair or replacement); The hydraulic pump is not started (check whether the power supply is in good condition and whether the thermal relay is working); The corresponding solenoid valve is not opened (check the valve body relay, solenoid coil and relay, if there is damage and need to be repaired or replaced).

2 The flap has no action

Causes and elimination methods: the hydraulic pump is not started (check whether the power supply is in good condition and whether the thermal relay is active); The proximity switch is damaged or the distance is improperly adjusted (replacement or reasonable adjustment of the sensing distance); The unloading solenoid valve has no action (repair or replacement).

Conclusion

As a kind of liquid impurity removal equipment, in addition to considering the safety and convenience of operation, the sealing of the electrical control box and the corrosion resistance of the components should also be considered when selecting the automatic chamber filter press, so as to reasonably ｓｅｌｅｃｔ the control mode and the installation location of the control box. In the initial stage of debugging, you should first test the single-stroke actions such as compression, loosening, taking, and pulling the plate one by one in manual mode, adjust the position of each limit point reasonably, and ensure that everything is normal, and then adjust to automatic mode and linkage debugging. In the usual daily patrol and spot inspection work, it is also necessary to check and confirm the pressure gauges of each limit point and electrical contact, and observe and record the use and corrosion of electrical components.