PLC control two pump start-up failure solutions to problems

 Situation:in the double liang steam double-effect lithium bromide absorption air-conditioning unit,the use of omron PLC (PA204S C200HE-CPU42,power supply) to control the start of two pumps. When,in turn,start the two pumps,often led to the suspension of the power of the PLC,thus stop running program.Second,the detection of 1,use the meter to measure the voltage electric motor 12v 500w waveform of two pump ordinal startup PLC power PA204S ac voltage of the power supply change found:when did not start the electrical motor 12v 1000w pump,the voltage of the power supply is normal,when start the two pumps,instantaneous fell to the power supply voltage of 184 v,184 v and the duration of the above 25 ms,PLC to stop working,and to determine the effect of pump power of PLC.2,in order to solve this problem,respectively for the following tests: A) driving the pump first,delay around 10 s to start small pump,power supply voltage drop to about 190 v,the instructions first,pump makes instantaneous voltage drops,later start small pump,affect smaller,but it need to modify the PLC program.

B) because the pump power supply is turned by high tension line through a transformer,transformer capacity,can be considered a large capacity of transformer,may make the pump will be smaller influence on the PLC power supply voltage.C) in the PLC power supply termination a large capacitance,but the effect is not obvious.D) finally in one power supply transformer converted by a 220 v power supply to PLC,found that even in the start two pumps at the same time,PLC power supply voltage drop is only about 204 v,204 v,the can.Conclusion:as a result acmotortrading.blogspot.com of the PLC power supply is supplied with water pump in the same way,and the plant's transformer capacity is small,so in the start two pumps,caused the PLC power supply voltage drops below 85% of rated voltage,and duration of more than 10 ms,resulting in PLC detected power interruption,stop working. So the advice from the transformer converted one by one in the 220 v power to separate for PLC,which can solve the problem.

Trapezoidal wave commutation

Control of brushless dc motor is one of the most simple way is the so-called "trapezoidal wave type" commutation. In this scheme, we only control a pair of the current in the motor coil, and the third line generator set spare parts circle has been in contact with the power supply is not in the circuit. Installed in the motor internal hole signal once every 60 degree Angle detection, and the detected results through digital signal feedback to the controller electric vehicle motor part of the motor. Because in the case of trapezoidal wave commutation, only two sets of coil motor is connected with the same current, and the third group of coil current Induction motor is zero, so this way of testing the motor rotation can only be detected in a lap six direction of current vector. In the process of motor rotation, the motor current once every 60 degree change, so each current vector only within the scope of wholesalemotor.blogspot.com current calibration about 30 degrees. The current waveform from zero step jump to a positive maximum current, and then to zero, then into a negative maximum current. In this case, the motor current in the six regional jump regularly, make motor can approximate running smoothly.

Dc speed governing how to do

Dc speed regulation is mainly divided into two small electric fan motor kinds:one kind is the armature voltage adjustment,change the armature voltage,is to adjust the rotor current,high voltage in the armature is big,current through the coil rotation torque is big,Particular way is:1,in the series resistance of the armature circuit,and the change of resistance value;2,change the armature circuit voltage,generally USES the rectifier power supply.A change in excitation voltage.The speed is also called weak electricalmotor1.blogspot.com magnetic speed control,which is in,normally adopt the method of changing the armature voltage adjusting speed,when the above methods can not meet www.facebook.com/guohong.trading the motor lamination requirement of the speed,can change the excitation voltage,speed,when the excitation current is lower,the speed of the motor.Particular way is:1,in the excitation circuit of series resistance,change of resistance value;2,change the excitation circuit of voltage,generally USES the rectifier power supply.

Frequency control method

Frequency control of motor speed is to change the frequency of the motor stator power,to change its synchronous speed control method.Variable frequency speed regulation system is the main electric motors price equipment to provide frequency conversion single phase induction motorpower converter.Inverter can be divided into ac-dc-ac frequency converter wholesalemotor.blogspot.com and

ac-ac frequency converter two kinds big,cross-straight-to pay inverter are mostly used in China at present.Features: high efficiency,speed the process of no additional loss;Application range is wide,can be used in the cage type asynchronous motor;Large range of speed regulation,and the characteristics of hard and high precision;Technology is complex,high cost,maintenance difficulties. This method is suitable single phase asynchronous motor for the requirement of high precision,better speed control performance.

Grilled slag machine and hydraulic principle of scraper

Grilled slag machine as an assignment of necessary tools for mining in,only to its working principle

thoroughly,can in the scraper "suit the remedy to the case" at fault.And scraper,as a new type

acmotortrading.blogspot.com of underground mining equipment,a lot of people with wisdom,for grilled slag machine working principle and the power conversion process is a little knowledge,the following by ZhongLiang grilled slag machine to lead everybody to learn the torso of the slag machine hydraulic working principle.Grilled slag machine's main power comes from the power,the first is an external single phase induction motor 380 v or 600 v (improve) according to the requirements of voltage sedan electricity,through the motor or electric roll Jane to convert electrical energy into mechanical energy,to drive the gear pump to start working or conveyor belt,gear pump from the tank inhalation after two clean the hydraulic oil filter.Hydraulic pressure oil input element,priority shunt felling,and through the cutting oil is divided into four different directions: multi-channel control valve (distributor),direction of machine P,priority direction machine control,oil return to the tank.Understand the working principle of grilled slag gasoline generator spare parts machine and hydraulic systems of work flow,this will make grilled slag machine troubleshooting speed increase,will make us better master the laws of scraper operation.Quicker to the combination of grilled slag machine failure,find out the location of the failure,faster and more accurate solution of slag machine fault.

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Energy-Saving AC Three Phase Motor 90HP 220V

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