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Repair countermeasures for fault light of soft starter of water resistance cabinet

Jan 09, 2021

Repair countermeasures for fault light of soft starter of water resistance cabinet

 The maintenance countermeasures for the soft starter of the water resistance cabinet when the fault light is on, the user thinks of saving the electricity bill, or because of the process transformation, the frequency conversion transformation is required. But after the inverter is connected, the frequency jump OC fault, this is good, the protection stops, and the module is not broken. The scary thing is that the inverter does not immediately jump to the OC fault, but is in operation for no reason-after only two days of operation, the module exploded and the motor soft starter burned out. The user relied on the salesperson: The inverter you installed is of poor quality and burned my motor soft starter. You have to pay for my motor soft starter! Before this, the motor soft starter seemed to be really no problem. It ran well and measured the running current. Because the load was lighter, it reached half of the rated current; measured the three-phase power supply, 380V, balanced and stable. very. It really seems that the inverter is damaged, and the soft starter of the motor is damaged. If I were there, I would be fair: I don’t blame the inverter, but your soft starter for the motor is already "dying ill."


 Repair countermeasures for fault light of soft starter of water resistance cabinet


Short-phase faults will occur during commissioning, and the fault indicator of the soft starter will light up when the motor is not working. The possible reasons for the failure may be:


When the start mode is in the charging state, the operation sequence is wrong (the correct operation sequence should be to send the main power first, and then the control power). Power supply short circuit, soft starter protection action (check power supply). The output of the soft starter is not connected to the load (the soft starter can only work normally after the output is connected to the load).


If the soft starter has started, but the bypass contactor cannot attract. The possible reasons for the failure may be:


During the start-up process, due to the small setting (resetting the protection device), the protection device failed. When setting, the parameter setting of the soft starter is unreasonable. (Mainly for the soft starter below 55KW, reset the parameters of the soft starter) Poor contact of the control circuit (check contact)


 Repair countermeasures for fault light of soft starter of water resistance cabinet


Air separators for raw meal mills, cement mills, and Raymond mills, degassing fans in sewage treatment plants, return fans and blowers for central air-conditioning, dust removal fans for various workshops and processes, fans for spraying systems in automobile plants, various heating furnaces, etc. Fans for hot furnaces, blowers and induced draft fans for industrial boilers, fans for recovery units in natural gas purification plants, Roots blowers for fertilizer plants, etc. 9) Application of soft starters to various types of crushers. Cement factories and mines have various types of crushers that can use soft starters. 10) Application of soft starter in pulp production line Soft starter is widely used in pulp production line refiner, grass cutter and other equipment. 11) Application of soft starter in ball mill equipment Application of synchronous ball mill user: a mineral processing company in Inner Mongolia; load type: ball mill; motor soft starter type: synchronous motor soft starter; rated voltage: 10KV; motor soft start Rated current of the motor: 87 A; pole number of the motor soft starter: 4 poles;


 Repair countermeasures for fault light of soft starter of water resistance cabinet


If the control voltage is too low, the main control board of the soft starter will stop working, and the whole soft starter will stop the motor and the soft starter will stop. If the control voltage is too low, the bypass contactor of the soft starter cannot be closed, and sometimes the contactor will repeatedly oscillate. If it is just that the control voltage is too low, the user can take voltage regulation measures to solve the problem. There is also a low voltage. Under normal circumstances, when the motor soft starter is not rotating, the voltage is normal. When the soft starter starts the motor soft starter, the voltage drops drastically, generally down to 70% of the rated voltage. It cannot be started at all for heavy loads. The motor soft starter will be large current for a long time until the soft starter fails to protect. The main problems that cause low primary voltage are transformer capacity and cable length and quality. The specific problem is that the soft starter works normally, and the stable voltage is the basis. Although the soft starter is very useful, Lingke also reminds everyone: don't do it yourself when installing the soft starter.


 Repair countermeasures for fault light of soft starter of water resistance cabinet


 The maintenance countermeasures for the soft starter of the water resistance cabinet are to eliminate and reduce the harm of water hammer. When the liquid is suddenly accelerated or decelerated by external force in the pipeline system, or changes the flow direction, it will cause water hammer. Water hammer is very harmful, from the slightest it causes the pipeline system to vibrate and emit noise, and the serious is to cause damage or even the pump room. Flooded. The soft starter with general functions cannot completely eliminate the water hammer phenomenon, but it can basically reduce the water hammer hazard. If you want to completely eliminate the water hammer hazard, you need a soft starter with a special pump stop function. The actual application of various brands of soft starters shows that the soft stop time of general function soft starters can not be set too long to prevent water hammer, generally 4~6 seconds (similar to the effect of a micro-resistance quick-closing check valve). If the time is too long, it is easy to damage the soft starter. The specific reason has not been reported yet. 2) The application of soft starters in fire pump control. Hydrant pumps and sprinkler pumps are important fire-fighting equipment for fire-fighting facilities in industrial and civil buildings. Their operational reliability is extremely important. With the construction of large and medium-sized construction projects.