The inverter no-load current is greater than the load current

A 75 kw micro can WIN-G9 inverter commissioning the strange phenomenon,Associated with the manufacturer's technical personnel a piece of paper,trying to find out the cause of the electrical and mechanical aspects.Whether whether new repair,such as motor winding winding bad; Bearing any permanent magnet generator wear and tear,unstable running; Is there a loose connection shaft and different heart phenomenon; The blades have deformation,etc.To restore the original start tank connection,power frequency power frequency starting motor do diesel generators prices contrast,one by one,ruled out the suspect,and according to the in-situ observation,the motor and the load status is good,can hardly hear the running of electrical and mechanical noise.Run at full speed under no load current is only less than 35 a,three-phase balance,no wave! No problem with the motor and load,the problem also in frequency converter.So of the frequency converter fault in where? 

A little scratching his head.Is that current detection not,cause error output? Observation panel displays the current value and clip-on ammeter measured near,there should be no problem.Or there is something wrong with the CPU motherboard,the output waveform is wrong? Makes no sense.Digital circuit ah,how waveform is wrong? Well,live not far electricalmotor1.blogspot.com from here have another same model with the power of change,with the load is the same,it would be great.It brought great convenience to the contrast test.The manufacturer in a hurry to opening up to the machine,also gives a positive cooperation.Will two inverter current transformer swaps,invalid.The motor vehicle two machine CPU motherboard swap shall be null and void.Bring up the main circuit,according to the dc voltage is 550 v,voltage sampling circuit also have no problem.Never figured out where fault block circuits.Compare the machine in the load cases,10 hz running current is 75 a,more than 35 hz,running current to reach 100 a,smaller than this one with no-load current of motor.No-load current was far greater than the load current,the frequency converter must be have a problem.

General converter electrical engineer to teach you the overcurrent

General converter electrical engineer to teach you the overcurrent protection and treatment methods Overcurrent protection function of the frequency converter is a very important role in the frequency converter,the following introduce you to the cause of the over current and processing method Frequency converter in the overcurrent protection object refers to with paroxysmal qualitative,peak current,exceeds the permissible value of frequency converter.As a result of the inverter device overload ability is poor,so frequency converter overcurrent protection is a vital link,so far has been very perfect.(1) the cause of the over current A.over current work The current system appeared in the process of work.The reason for this is roughly from the following aspects: A) motor encounter impact load or drive mechanism to the sudden increase of motor current phenomenon of "stuck".B) inverter output short-circuit,such as the connecting line between the output to the motor motor internal short circuit or short circuit,etc.C) inverter itself is not normal work,such as two of the same bridge arm in inverter bridge inverter device in the process of alternating work abnormal.For example due to environment temperature is too high,or aging,the inverter device itself to change the parameters of the inverter device,cause in the process of alternating,a device has been conducting,and another device but also in the future and shut off,causing the same bridge arm of the upper and lower two parts of "straight",the dc voltage between the positive and negative in the short circuit state.

B.over current acc When the load of the large inertia,and set up time and too short,means in the process of advance,the working efficiency of the converter rise too fast,the synchronous speed of the motor because of the large inertia load and couldn't keep up with,and the result is acc current is too big.induction motor price C.over current slow down When the load of the large inertia,and slow down the time set too short,can also cause overcurrent.Because of the slow down,the time is too short,synchronous speed drops rapidly,due to the load and the motor rotor inertia is big,still maintain a high speed,then the same can be the speed of the rotor winding cutting lines of magnetic force is too big and over current generation.(2).Treatment methods A -.When starting A liter of tripping speed,this is very serious phenomenon over current,major inspection (1).Working machinery have stuck (2).Load side if there is any short circuit,check over the ground by megohmmeter for short motor fan circuit (3).The inverter power module if there is any damage (4).The starting torque of the motor is too small,the drag system turns up B.starting without tripping immediately,and tripping in the operation process,the main check: (1).Set up time is too short,longer acceleration time (2).Deceleration time setting is too short,longer deceleration time (3).Torque compensation (u/f ratio) set too big,cause the low frequency time load current is too large (4).Improper electronic thermal relay setting,current action set is too small,misoperation caused by frequency converter

gear and rack drive construction lifter

Gear rack drive type (SCD) construction lifter is of single column double cage,equipped with the

weight of the wall construction lifter.The structure of the use of single column double condole cage

to save material,set of heavy block with a certain energy-saving effect and the hoisting cage falling

have certain protective effect.Of weight of this model,no fall protection devices,hoisting cage on

only a limited (super) speed device (lift regular high and low,equal fault protection exception).Hang

the power plant is located in the cage,driven by gear and rack is big,big noise,vibration and wear

fast and power cable to the disadvantages of coarse,not conducive to speed up,etc.2,gantry Gantry is double columns,single hanging basket,attached to the wall type,hoist single rope forced traction increase,its material,energy consumption is large,broken rope rotor cutting machine protection device generally adopted into type,using trigger broken rope protection device,such as the spring trigger reliability is poorer,less braking safety.

Do not conform to the compulsory industry standard-"building construction safety inspection standards" (JGJ59-99) on the terms of the requirements,often appear machine crash accident,the country being eliminated,but because of its low price,installation is convenient,easily accepted by the user.Aluminum alloy type Aluminum alloy lift high strength high quality aluminum alloy materials,due to the high intensity profile,minimal deflection and swinging the lifting platform.New design of a new generation of elevator has beautiful shape,small volume,light weight,balance,and the advantages of safe and reliable,the appearance of the light,it can be in tiny space in the highest lifting ability into full play.Make a single aerial work becomes easy.Widely used in factories,hotels,restaurants,railway permanent magnet motors for salestations,airports,theaters,exhibition halls and other places,is to maintain machine,paint decoration,exchanging the lamps and lanterns,electrical appliances,such as cleaning and maintenance purposes best partners.

Crank arm type work high lift car can overhanging operation,across some obstacles or in a lift can be carried out more work;Platform capacity big,for two or more people work at the same time and can carry a certain device;Lift platform mobility,convenient transfer site;Beautiful shape,suitable for indoor and outdoor operation and storage.Applicable to the station,wharf,shopping malls,sports venues,residential property,factories workshop and so on a wide range of operation.A,innovation,developed the SSD model of single column double cage hoist 1,the reference design (1) reference attached SCD construction lifter of single column double cage,SCD construction lifter column using an attached lever to transition frame fixed to the wall attachment methods,SSD construction lifter column by the attached bar fixed on the wall,eliminating the transition.(2) using the elevator using wedge rotor and stator brake and traction elevator design,using wire rope traction elevator and wedge brake.Trigger such as wedge brake using non-traditional spring,because spring rust will lose elasticity,so new reliable trigger system is designed.

2,innovation protection design Use unconventional design way and the thinking of innovation,make the products not only meet the national standard,also higher than the national standard.(1) the SSD type hoist crane cage and the weight of two root traction rope automatic tension balancing device was designed and implemented two traction rope hoisting cage and the heavy block,ascending simultaneously than save a few root elevator traction on the rope.(2) the tractive rope for wear in a single week,the week wear,local extrusion caused by internal wear and broken wire broken stocks,beyond the amount of extension,the rope break before they can be protected.To avoid the wire rope breaking point on both sides of the rope body disorderly fall from the sky,not cause safety accidents and subsequent damage.(3) the hoisting cage and the weight between the number of root traction rope after fracture,and there was a hoisting cage and the heavy two-way for protection.(4) the hoisting cage and the weight of any root traction rope fracture,all have the corresponding fault line protection.(5) when the rise and fall of the normal work of the hoisting cage or power failure,the hoisting cage stops at any level,in addition to the normal brake motor function,the cage stops running,has overcome inertia and tractive rope hanging cage elastic effect

caused by the lift cage string move up and down the electromechanical integrated device and stop

device,dock automatically stop layer and protection.(6) when the motor brake failure or coupling

damage caused by traction wheel out of control,and the two root traction rope did not break,the heavy

piece or hanging cage on one side of the slide speed falls down,have to lift heavy blocks and cage

two-way overspeed protection.The protection device of speed sensing device for mechanical and

electrical integration,overcome the elevator mechanical speed limiter one-way speed

sensing,unfavorable outdoor installation.

Motor vibration

Motor through a transmission mechanism is connected to a machine.motor vibration can ac

electric motor result in mechanical vibration.mechanical vibration also can make the motor vibration.motor and mechanical transmission part release to start the motor.if eliminate vibration is a mechanical failure.or is the motor vibration.vibration reasons:the diesel generator motor seat is not firm.mechanical part of the motor and the driven generator rotor and stator shaft are different.the motor rotor imbalance.motor shaft bending.belt wheel spindle eccentricity.squirrel cage several breaks.bearing damage.unbalanced electromagnetic system.www.dongfeng-motor.com electric JiSao chamber.