Dc voltage measurement

This is a current situation,the multimeter dc voltage in the dc power supply voltage,measure the working voltage of peripheral components;Different IC pins of dc voltage value,and compared with the normal,and compression failure,find out the damaged components.When measured at 8 o 'clock to pay attention to the following:(1) the multimeter to want to have enough resistance,at least more than 10 times greater than the resistance of the circuit being measured,so as not to cause greater error of measurement.(2) usually put the potentiometer to the middle position,if it is a TV set,signal source to adopt standard color bar signal generator.(3) to take pens and asynchronous motor or probe anti-skid measures.For any instantaneous short circuit is easy to damage the IC.Can take the following methods to prevent the pens and sliding: take a bike with a valve core set of pen in the table,and the long table pen is about 0.5 mm or so,it can make the table pen well and the point contact under test,and motor run capacitor can effectively prevent the skid,and even meet with neighboring points can not short circuit.


(4) when the measured voltage does not accord with normal,a pin voltage should be based on the pin to IC normal work have important influence as well as the other pin voltage were analyzed,and the corresponding change to ac electric motor judge of IC.(5) IC pin voltage will be affected by peripheral components.As peripheral components occurs leakage,short circuit,open circuit or value,or peripheral circuit connection is a variable resistance value of the potentiometer,the location of the potentiometer arm,will make the change pin voltage.(6) if IC voltage is normal,the pin is thought IC is normal;If abnormal voltage IC part pin,it should maximize deviation from normal,check the peripheral components for XXX,if wholesalemotor.blogspot.com no failure,the IC is likely to be damaged.(7) for dynamic receivers,such as TV,in the presence of signal,IC pin voltage is different.If discover pin voltage should not change but change is big,the size and adjustable with the signal components of different locations and change but do not change,can determine the damage of the IC.(8) for a variety of ways of working device,such as video,work in a different way,each pin voltage IC are also different.

Multimeter application technique measure skills

1,the road test diode,transistor,voltage regulator tube is good or bad,because in the actual circuit,bias resistors or diode triode,voltage regulator tube peripheral resistance is compared commonly big,mostly over hundreds of thousands of ohm,in this way,we can use the multimeter R * 10 Ω or R electricalmotor1.blogspot.com 1 Ω shift to measure the p-n junction of the road. In road measurement,measurement in R x 10 Ω gears p-n junction should have a clear direction,features (if the positive and negative to the resistance differs not quite apparent,can convert R x 1 Ω file to test),generally positive resistance at R x 10 Ω file whose hands should be instructed in about 200 Ω,time measurement motor run capacitor in R x 1 Ω file whose hands should be indicated when measuring around 30 Ω (according to different phenotypes may differ ac electric motor slightly). 

Forward resistance is too big or reverse measurement results if the value is too small,suggests that the p-n junction has a problem,the tube also have a problem. This method was especially effective for maintenance,can very quickly find out bad tube,even has not been fully broken can be detected but bad tubes. For example,when you use small resistance profile measurement is a PN junction resistance is ac induction motor too large,if you put it down with the commonly used welding Ω R x 1 k file and test,may be normal,in fact,the characteristics of the tube has gone bad,cannot work normally or unstable.2,measuring resistance: it is important to choose the right range,when the pointer instructions from 1/3 to 2/3 full scale measurement precision is highest,the most accurate. Note that in R x 10 k ohms resistance measured level of resistance values,not to fingers on both ends of the resistance,so that the body resistance will make small measurement results.

Low voltage circuit breaker C45 series

C45 series is the introduction of merlin gerin (France) technology products,domestic models for DZ47.As the light distribution system,motor power distribution system and electrical control circuit overload protection and short circuit protection.3.The main technical parameters of low-voltage circuit breaker: 1) refers to the circuit breaker rated voltage under prescribed conditions for long-term running can withstand voltage,generally for the line voltage.Commonly used with ac 220 v,380 v,500 v,660 v,etc.2) rated current refers to the circuit breaker can be long-term wholesalemotor.blogspot.com under prescribed conditions by the current,rated current is known as the trip.

3) the rated short circuit making capacity Refers to the circuit breaker under the condition of single phase electric motorrated frequency and power factor and other rules,the ability to turn on the short

circuit current,with the maximum peak current said.4) rated short circuit breaking capacity Refers to

the circuit breaker and the rated frequency under specified conditions,such as power factor,to

breaking the maximum short-circuit current value.5) rated short-time resistance current Refers to the

circuit breaker under specified test conditions,can withstand current value within a specified

Dongfeng Electric between timely.From the action time of the 6):refers to the electrical control line began to contact separation,short circuit instantaneous arc extinguishing,circuit completely breaking all need time,also known as gasoline generator the breaking time,generally is 30 ~ 60 ms.

The operation of the three-phase asynchronous motor monitoring

Three-phase asynchronous motor running monitoring:1,monitoring,motor overheating 2,monitoring the working current of the motor is more than the rated current 3,monitor power supply voltage with or without changes 4,monitor whether the three-phase power supply voltage and current balance Note: in the operation of the three-phase asynchronous motor 1,pay attention to the ventilation of the motor and the environment 2,pay attention to the motor vibration 3,pay attention to the noise of the motor with or without abnormal situation 4,pay attention to whether motor abnormal smells 5,pay attention to the working condition and fever motor bearing Daily monitoring master electrician motor five often:1,often listen to.Motor issue during normal working uniform "buzzing" sound.Particularly heavy when I heard the "buzzing" sound,or "utter the word" sound,motor open phase running.

If heard a continuous "guru" or "giggle" sound,that there is something wrong with the motor bearings 2,often

have a look.See the ammeter or a voltmeter indicates whether or not the normal;See if three phase

current balance;See whether the power supply voltage of three-phase;See Motor

vehicle if motor on the basis of solid,etc.3,often monitoring environment temperature.The output power of the motor temperature has a great relationship with the surrounding environment,the

environment temperature is higher,the smaller the motor output power.When the environment temperature below 35 ℃,motor power output will be greater than the rated power output,the increase of amplitude of (35) % (t for the actual environment temperature),but not more than 8% - 10%;When the environment temperature above 35 ℃,the output power of the motor than rated output power reduction (t - 35) %.4,often feel.Back with your fingers touch the motor shell,temperature rise is too high.As the hot

hand,motor has overheating.5,often smell.Whether with his nose close to the motor,smell the smell of

insulating varnish or anxious burnt flavour.If have,diesel generating set could be the result of a coil of motor overheating and short circuit,etc.

Three-phase asynchronous motor rotor current and the stator current is increased or decreased?

Three-phase asynchronous motor in the power supply voltage must be,if the load resistance increases,will force the output of the electricalmotor1.blogspot.com motor torque increase,at this point,the rotor of the motor current and stator current how will increase

accordingly.Three-phase asynchronous motor in the power supply voltage must be,if the load resistance increases,will force the output of the motor torque increase,at this point,the rotor of the motor current and stator current how will increase accordingly.Three-phase three phase generator asynchronous motor running under the rated voltage,load increases,the resistance torque is increased,the speed will be reduced,but very small,so that the motor stator and rotor of frequency offset,the impedance of the system (inductance),three phase stator current,rotor induced current also increases accordingly.Of course the load increases load power is also increased.By reducing load increase,rotational motor fan speed,the motor rotor speed than the stator rotating magnetic field rotation speed increase.Slip,motor output torque increase,at a certain frequency and voltage.The rotor and stator of the motor current will increase.Current increase natural motor output power is bigger.

Rapid detection of the three-phase asynchronous motor winding judgment method

Rapid detection of the three-phase asynchronous motor winding judgment method,1,balance of the three-phase winding resistance.The multimeter R x 1 Ω resistance,which leads to the cable resistance value of the (3),should be equal.Such as,cable or motor winding fault;Should further wholesalemotor.blogspot.com measurement on the junction pole of the motor,such as ranging,explain the motor winding is defective.2,ground check.The multimeter R x 10 k or R x 1 k resistance measurement cable core screw together (3) and the casing,the resistance value between the www.facebook.com/guohong.trading less than 0.5 M Ω,be affected with damp be

affected with damp;Close to zero,is probably the ground fault.3,check insulation between the phase

within.Can be connected patches on the terminal small electric motors will be

removed,polished terminal resistance perkins diesel generator value between the above three terminal,less than 0.5 M Ω,be affected with damp be affected with damp;Close to zero,is likely to be short circuit fault.4,the rotor can check.In the case of without load,with the hand gently turn the motor shaft,such as transfer,illustrate bearing failure.

220V YC single-phase asynchronous electric motors double running capacitors IP44 IP55 IP56 1.2.3.4.5hp high torque

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