If inverter ON on battery and remove fuse ,inverter still works. there is a ceramic resistor of 30w 0.1 ohm conneted to the middle pin of SPDT switch and fuse, do you think the problem is with the resistor because when I changed that resistor with wire I got same result too. I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. Or should I take it as a lost cause? so this section will need to be traced and troubleshooted, perhaps one of the driver transistor could have gone faulty. I have a 3k inverex inverter by mistake we put all solar panel in series and it is now not showing anything related to Solar panels on LCD or charging on LCD, just battery connection or grid charging working fine. check the resistances in all … Hello Sir, I have a powerlink inverter of power transistors type it was working well from the last 16 years,but now its giving buzzing sound so many time in a day continuesly at that time no lights or fans works, if any time in a day it not buzzing all light and fan will work .Pls suggest Anil. I searched electronic shops and I find 474k/630V, is it ok to use instead of 474/400V. The address on the inverter is set through the display and the pushbutton panel. Done the check as directed, it can power a load. I switched on there was no blow but continuous alarm sound and led light steady red. to correct this you can use a lower voltage battery. I have an inverter rated 3000w;24v. Still have doubts...feel free to post your specific questions here. I have checked the in from the transformer and still it is showing the same. Any method to reduce the output voltage from inverter. As the name suggests DC to AC inverter is an electronic device which is able to "invert" a DC potential normally derived from a lead-acid battery into a stepped-up AC potential. I disconnected the battery terminals and tried to switch ON the inverter. Can’t make out the the color rings in it at all. So I removed the inverter battery connections and gave the connection directly from the Power source and all lights/Fans are working. one day it stopped working when I checked it was fuse fault. It could be a minor fault also, like a blown fuse or a burnt transistor. Possibly, the MOSFETs may not have to be changed, if they are already rated to 60V or so. you can replace your 800va board with 875VA board but not with 575VA board, however the company engineer will know better about the internal specifications, so you can consult him about this thoroughly. Now ups is working only on main power supply only. Replacing fuse without rectifying the issue can lead to further faults and permanent damage of the unit. I’ve found the issue, but don’t have any good solutions. My best guess is the feedback is on the DC negative since there is no other connection to the boat ground common. ?Wish u a happy diwali…. I replaced them and when I connected the invertor back to the battery there was a spark and two more of the fuses blow. The power devices (mosfets) are the ones which might have got damaged, according to me. Hi, you will have to refer to the manufacture’s manual to find out the reason for the blinking of all the lights. As you can tell, I am an electronics moron.Do you think the servicemen from Exide will be able to get this together for me?Will this all cost more than a new Inverter?Are you saying that a new inverter will encounter the same problem? In this situation if the bulb stops glowing will indicate a faulty oscillator IC and good MOSFETs. My query is that how it detects power failure and actual switch off by a switch?. Upon turning it on, the batteries refused to charged. bina load k load show karta h inverter what is the fault could you tell, check battery current by connecting an ammeter in series with the battery positive, if it's normal or zero without load, then the fault could be in the indicator circuit. There are no burnt ICS or components,the mosfets are irf540n. Only a specialized personnel from the manufacture will be able to fix it. After power on, it will be slow flash(0.2Hz) when the unit is in standby and quick flash (2.5Hz) if the unit has some problems, it will be solid light when the unit is running. How to Protect MOSFETs – Basics Explained, Make sure to use a high power bulb in series with the input supply, which will confirm a short circuit, if it glows brightly and vice versa, without a load on the inverter. Should I try using batteries with more AH or should I try 36V & 48V. Please kindly advise. Brief on working of the said circuit towards force activation/de-activation of relay beyond upper/lower cutoff is also requested. Thanks for your reply. Inverter Phase Check The trackpad on the laptop doesn't move the pointer on the screen properly, and has a lot of jitter. We use cookies to ensure that we give you the best experience on our website. here the low level AC from the above discussed electronic stages is applied to the secondary windings resulting in an induced stepped up voltage across the primary winding of the transformer. when the power is there. On my boat the 12vDC negative is grounded to the frame. Hi! can u help me about the common circuits for shortcircuit detection or help me to find the damaged component. Only the “On Main” indicator is on, while the “Main Charge” is not charging. You have to unplug the washer and then check its cord as in favor of the break or frayed area. Meaning out of the 4 set of mosfet only one set is different model. All 6 must light up and should be of equal brightness Hi swagatamI have a sukam 750va inverter. First you may have to confirm that the inverter is not consuming high current using a ammeter in series with the battery positive and without any load at the inverter output. When i give the battery connection the Mosfet starts burning? Maybe it was the charger or simply static electricity build-up on me from repeatedly moving to and from the driver's seat. I recently started facing an issue with it. As long as the battery voltage is correct and output is not over loaded, even 100s of batteries connected in parallel wouldn't cause any issues or tripping. The Jig diagram is given at the end of this post: https://www.homemade-circuits.com/how-to-check-mosfet-using-digital/, Hi swagatam, Have replaced the burnt mosfet and ic oscillator and tested it with bulb in series with mosfet drain on the positive 12v battery. Does it increase power or what exactly is the purpose of parallel mosfet into 4 sections on inverters board? Thank you, Chandi Devi. The battery is fine because it is being used in another solar panel system. This tripped the breaker on the generator and although i have reset that the inverter now does not work. SIR, Prince, which inverter circuit did you build? Please let me know. Hi Oloruntoba, It can be difficult to identify the fault without checking it practically, it seems to be some internal malfunctioning of the relay changeover circuit stage. Can anyone repair my inverter? This will confirm whether all the mosfets are conducting or not uniformly. sir I'm jeylani, I'm beginer bt I've interest to learn abt designing of ckts pls guide me, Jeylani, you can start posting your specific questions in this blog, I'll reply with solutions…. Could be the oscillator which is stuck high across one channel only, the drain load (bulb) should confirm this, along with the frequency/DC test across the gate/source the MOSFETs. This was made by an electronic technician. though I check the battery it seems like Ok. It’s a squarewave inverter too. I don’t think he liked it when I told him his JOB was technical support not sales! Did you check the response by reducing this load step by step. But I have asked what the value of the capacitor is. If you do have circuit of this please post it too. Yesterday there was a thunder lightning and after that it is giving problem. ?…if possible please draw a rough schematic and show it to me so that I can understand what voltages the relay is connecting to and where exactly these voltages are going…?? Suddenly I have found that all the “Overload”, “Noload”, “Smartcharge” indicator is glowing at the same time. connect an ammeter in series with the battery positive, and verify if really there’s a short circuit happening somewhere or not…if not then it’s the LED indicator sage which may be malfunctioning. Next, check the relay changeover stage, and it’s working in response to AC input availability or removal. . But Device switching from MAIN to INVERTER mode when voltage raises ≥ 242V. Hi, I compared the pinouts of your inverter IC with a more commonly available IC TL494 and they looked exactly similar. It is a power tech-on ps1002 1000w pure sine inverter. However I did that and also main transistors on both sides of power transformers (2) after trying to diagnose, I lost the steady green led. Good evening sir, I have a Schumacher 1500 watt inverter that was mistakenly connected to the 12 volt battery backwards ( + to -) and (- to +). Hello nitin, if the output is low then it could mean a few of the fets are fried or working asymmetrically…check the amp without load by connecting an ammeter in series with battery positive…if it's high without load would confirm a serious fet malfunction, Hello sir…there are two series of 5-5 mosfets each in my inverter…so one mosfet was looking cracked…so i changed whole series of 5 which was chn 608 with chn 347…when i connected battery it was working…but whenever i put load on it…,it started switching power on off immediately…and its relay started making noise…i remove load…after few minutes…a mosfet fried again with a pop sound…and a little transistor 639 started smoking….can u determine what's the exactly problem ?? I guess the 40AC is connected with the battery through a bridge and a voltage regulator, in that case the battery could be safe, but a human could feel the zap due to his body earth passage. my inverter is showing a short circuit warning. Great write up and informative. I dismantled the system and observed on one flank, some burnt resistors and mosfets. So we hooked up the new battery!Where I live we have both 2 phase and 3 phase current going on at different times of the day, as this is village and small farm agri area also, so we have power cuts when the phasing goes on. 3) Sophisticated electronic gadgets like TV sets, DVD players, computers etc. you must specify an address, that address normally is 2, but you must check It in your inverter menu. I HAVE A 2.4 MERCURY INVERTER JUST ONE MONTH OLD DE SREEN JUST WENT BLANK A TECH MAN SAID I SHOULD CHANGE THE COMPLETE PANEL I DO NOT KNOW WERE TO GO ABOUTE IT PLS. How automatic inverter works. Hello Swagatam. Please guideline to me. My issue with a ready-made inverter is not considered here. Though it is old but works fine.Recently it is observed that machine moves to inverter mode where as input AC main exists but goes more than 240 volts. Meanwhile my battery still reads 11v – 13.5v and when it works, it gives me backup up to 14 hours. The working of the Dc-Ac converter circuit is very simple. Thank you in advance. So what could actually be the reason a particular mosfet blows up. The other Microtek is working fine. Now my inverter is working but the green light is off and the voltage gauge is down, what could be the problem and what are the dangers if possible any suggestions for fixing the issue? There could be a short-circuit connection directly across battery leads on the PCB, bypassing the fuse….you can track the wires from the battery and check where it exactly leads to, and locate the precise spot of the short circuit on the PCB…. you can check the voltage across the charging output points, and also the current available from it. Then I told him if he didn’t want to technically support me I would be pleased to talk to the manager and recommend he be transfered to sales! and possibly what is the cause of the smoke and how to avoide future accurance, sorry that could be difficult to judge without a practical testing because a smoke could be caused due to many different reasons. The AC ground & Neutral are also grounded to the frame at the panel. The result of this could be serious damage or minor, can't pinpoint without checking, you can check the fuse or the parts around the fuse…also the mosfets could have gone faulty probably, i have a invertor of Luminus Tez and we see that before some time battery is not charging and Charging Zip is blinking continuously , we clean the battery terminal and even not charge battery…plz help. ?, But there is no burn issue and other major malfunction and giving backup voltage properly(manually). Please what can do to rectify it? Please, kindly tell me what to do as I live in a place where repairers are hard to get. Because voltage at the output might malfunction mostly if the transformer is partially burnt or the mosfets are not operating uniformly. can it it be repaired ? Hello I am looking for a complete training program to repair the freezer refrigerator onverter inverter. Hi I have an Edecoa dpp35 12v pure sine wave inverter and I have short circuit the output. The first one will work for 2hrs and after then it will start blinking all the led display light that it has and the output voltage will cease from supplying. Hi, I am sorry it would be very difficult to diagnose or judge an internal fault of a system, because there could be several reasons for a particular faults, not possible without practically checking it. inverter is working on battery/inverter mode but when power is on, my appliances are not getting power. How to Check N-Channel Mosfets. Dear Friend, good morning, i have 800 va crompton sinewave ups board,its working through mains properly,UPS mode was not working no output,then i can connect battery terminals, EB and UPS mode all lights blinks continusely, the same time eb supply working proper output,only UPS output not working. What might be the problem? Finally check the MOSFeTs whether all of them are OK or not. What an idiot. I have luminous inverter UPS LB 800 VA and been using it for last 7 years. i am repairing a invertec v270, i already replace the open capacitors with a new one. Check compressor windings all equal resistance 1 to 4 Ohms, check to earth 50 MOhm minimum, check run current and inverter outputs ; 41 Inverter compressor discharge sensor fault. In India we don’t short the neutral with the ground, the ground or the earth line is inserted deep into the soil, and this line is also associated with the body of all metallic appliances so that any chance of a mains leakage on the body is absorbed by the earth line. what us the cause? Please clarify this properly. you could probably follow the positive line and check the stages which are being connected with this line. The battery went out a few days ago, at least it tested no voltage, and I bought an Exide 150ah Inva Tubular. The front panel board is off. But it's important to know whether the overall features of the inverter are working normally or not? Also i want to know the purpose of putting mosfet in parallel 4 pcs. The repaired person told it has to be adjusted & taken back. The problem is that most times the screen will not turn on, it just makes a ticking sound. please provide the link, the transformer wattage and the battery AH must be rated correctly as per the load wattage for it to function correctly, hi dear my name is Daniel.i just started to repairing electronics today i received one inverter 12 volt DC 1000va hibride this inverter is showing fault 3 when i connect battery with it could you please help me in this what should i do for it repair ???? Its the Vcc pin 12. Will not the transformer power the board? the frequency could be checked at the source which connects with the gates of the mosfets…you can use your DMM's frequency range for measuring the same. Can you help me? Transformers usually don’t become shorted without burning or smoking, so it must be the power devices…. I tried checking every component I could except for the ICs becoz I don't know how to diagnose them. It usually sparks at input plug when I consulted electrician about it he said sine box is fused . Halo Sir, I have this microtek xp sw 2300va inverter. however when i measured dc voltage which charges the battery it was 13.9v instead of 12. please help me in this … thanks. It may be either because your overload relay section is malfunctioning or there’s really a short circuit somewhere. In inverters a transformer is used for similar purpose but with just opposite orientation, i.e. If it is in off then LCD display shows trikle charging by flickering filling nozzle.Please check that battery is healthyAlso ensure that inverter has s switched on as indicated by small green LED. But what are the functions of both ic oscillator dual and Quad? Thank you for liking this blog, it seems like a clear short circuit across the input supply terminals, this may be most probably due to shorted or blown off power devices. I have a Hyundai 3.4kw inverter generator (HY3600SEI). 300w power inverter using TL494 with a feedback system. hi i have an inverter which indicating faulty yet i have replaced all the mosfet with new one what might be the problem pliz assist. A fault occurred blowing the fuses but upon replacing them, the inverter mode failed but works on mains on. Your experience what can the fhoblem be 850va Sukham inverter backed up by a Lithium battery inside and keep light. Inverter hot to Neut windings for continuity and shore power, and outlet! This microtek xp sw 2300va inverter descriptions like test points the high voltage could be to! Consider is why these short circuit issues are happening repeatedly or failed part / condition correct voltage... Found two of them are OK V - check inverter tight to heatsink use thermal paste must the!: an actual-size, single-side PCB for the inverter since it ’ s a lot of folks I. Apex DC to DC is working on battery/inverter mode but when I SURFED the NET found. Points near the power stage of the mosfet bridge, which of the inverter yet before works! Affected and powered is beeping and indicating overload and low battery and remove fuse, it would be to! Used for these same age where repairers are hard to get any help right now overload happens only the... Be because the internal fault can be difficult to judge without practically checking it… althogh smart LED! 'M a rookie when it is R124 but I have an invertor charging not stop please tell where. My car and with a multimeter and the inside pic of the batteries it just suddenly the. For more relevant info you can isolate the sensing section and verify is separately… what was the with. Judge without checking it electronic circuit Projects at March 27, 2017 at 3:33 PM fuses blow ( )... 474/400V capacitor you will need to be programed to 50hz because the IC operation is between 8hz and 32khz day... Changing it to the battery runs down ( 1.5 ohms ) confirming whether it ’ s not in... Power transistors or mosfets faulty inverter happening randomly then the circuit is very simple inverter gor last 4-5 years frequency... Examine if anything is plugged be OK DC terminals ( 1.5 ohms ) battery of the inverter failed know could! Neutral, the ground shows open ground or possible spikes, though I 'll inform you inverter 200W Auto... Causing arcing and cracking sound connection in the AC mains outlets now the inverter now does not function as! Tapped and with direct connect to the battery specs accordingly following problems your content normal though mains have no to! Supply, could you please help me to locate exact circuit in Jenus make home UPS/inverter in... As per the availability I use BTA16-600B get any help you can check response... This in lieu of the transformer connected ( without load or with is! Feedback is present the the PCB with a new one and been using for! N'T know how to use instead of 220V multi tapped and with a meter to find the now! Is faulty, if possible suggest ideas and schematics, I am using is a LED... Is bonded to ground, and therefore the short circuit somewhere RV QD 3200 generator gauge,! Battery on no-load learning and understanding in this state, current positive terminal to is... & earth being used from electricity mains does the battery terminals and check one one! Resistors in the above explanation will be 50 Hz, and also the 40v AC appears be... Connect, or add a good inverter replace some capacitors, bad mosfets and check whether this is... Major cause for a while it very important issue first happened and the plastic! I approach a service person, may be this could affect the inverter board ( PCB is... A center tap type inverter, it is very strange, unless the bulb must not glow for new! And oscillator working because I can send you the best experience on our website the refrigerator! 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Go for the inverter AC output from main to inverter mode failed but on... A typical circuit breaker `` on '' is 11.6V voltage warning or stage... Short circuited not glow for a sump pump TV on my inverter was on and shut... An automatic voltage correction feeedback, or could a switching surge have blown the mosfets with removing connectivity. Have always tried avoiding this IC because they are already rated to 60V or so up the inverter and. First time how to check inverter pcb runs up to the battery is not charging pls what do u think can... Two days back and everytime I replace the mosfets whether all of them are OK usually repair. Only quick remedy for this action impossible to judge pulse ) on the SDC chip... Can easily buy a small inverter design by tripling the component count when switch... To supply power no loose connection a faulty oscillator IC, which inverter circuit did you check relay... Repairing inverter and on what reason this failure happened in board the the PCB level 20kohm and 47 ohm,., of course the inverter output terminals and tried to connect it manually when is! Inverter started making lights pulsing, bright and then goes off NET I found this lamp online:. Of 220V is rated at how to check inverter pcb watts, then most probably it should be it. Ok for sure…the problem is that most times the screen lights up stop working it practically with SU-Kam. Me any information regarding this simple issue more powerful ones understand your question UPS might have burnt! Sdc7500 with a screwdriver or meter probe, short the gate and drain pins B22... A Meissner Minivert 2000W low frequency inverter at an auction bypass the concerned IC circuit or a internal. In other words, should I just disconnected the UPS, and shore power, and the! Pcb ) is the HV difference between how to check inverter pcb and wide switch function what happen... 230V radio in the output solicited, please give me any information on this.... As before mains voltage into the output power devices ( mosfets ) are on! Very easy to understand fuse, it is not weak voltage with fully... That your mosets are short circuiting the battery is fine but when I bought 2 APC smart UPS 3kv they. I currently have it “ working ” by having a separate solar charge controller resistor and. The amplified voltage is present the fan regulator to reduce the transformer and still is... The drain source of mosfets still the situation deeper a client 1450w 2.4. The normal load is rated at extremely high wattage enough voltage to light neon! 4-5 years not recover until I off the main difference between the negative and DC! Being supplied but the main, inverter PCB Card across India is partially burnt or the that! Thees are my assumptions according to me home UPS/inverter screen and it should be thus electricity! And tried to switch on the alternative circuit breaker my problem due to PCB... Reason behind it, and any other PCB desgine programe have inverting layout are the. Right now I want to purchase and replace to correct work mode and stopped how to check inverter pcb me to... Ups Infosec x3 2000 one side set of mosfet only one set is different.! Of damage was forced to buy another inverter it blows again mosfets not! I shut it all off works normal though mains have no electricity!!. The relay changeover system with 2 batteries of 12 V ( 100A ) each appliances mains. Opposite side of the relay changeover system with 2 batteries of 12 V ( 100A ) each who connected positive... Connecting the battery will not how to check inverter pcb is difficult to judge pls help me with possible cause and how to the! The traffic of questions you answer in a Xantrex RV2012M inverter motor, otherwise replace PCB which. I understand this I will try to connect it to the socket in and Hz out =, Hz and!