JAI Hind, F my name is "Raj" you are watching my youtube channel "Electric Locha" you can see , I have a PCB of inverter AC both indoor & outdoor it' showing P0 error I can show you "P0" whenever, I trying to ON it It showing this error this error comes from outdoor Today I will find out it , why it's come we do not work with error. But, I have seen P0 many before it So, I will tell you , while drinking tea . If you like also tea . enjoy with me. then you can understand quickly. So I will tell you about it. how to check it. mostly this error comes form outdoor PCB this error is IPM error. So let's begin IPM testing. Friends , you can see I have put pcb here this is it's IPM Problem should be here This is it's data sheet IPM NO.
is SCM1101M So it has total 33 pins. you can see it's pins total 33 pins This is bottom view , written here when we see it from top side pin 1 will showing here we can see here its pins details. because this error related to IPM P0 or PO whatever These pins can give error . fault output. fault output 1, 2 and 3. this is current sensing pin CS-01. if you want little bit time delay. for delay over current then you can change its capacitor value. this pin connected to shunt or opamp.
We will see its problem. moving PCB . you can see here. this is IPM. I have print one page only. this pin is fault output. 1 No. see here also. 2 No. is current sensing pin .
you can see this pin fault output also. this one also current sensor pin. fault output. and this one current sensing pin also . set the multi meter continuity mode. Now I will check faultout pins connect together or or not . testing connect or not. yes both are connected. and this. yes these 3 pins are connected. now testing current sense pin. yes both are connected. also connected here. these 3 are connected that's mean . one shunt use for all negative. these are 2 shunt resistor . So friends. I have traced out this . nothing is magic. Nobody can remember about all PCB's pins . I trace it also. this fault output pin connected here. if iPM have any problem. it send (-) to microcontroller . by this 100 ohms resistor. you can see here. this pin connected with this . and opposite side you can 100 ohms. if this pin connected with opamp , then it doesn't connect with GND this current sensing pin connected with this resister .
You can see its connectivity. connected with 2k resistor . if other side connected with GND that mean , it connected with direct to shunt. if this doesn't connect with GND, then it connected with comparison IC . any other person try to repair it. this IC did have changed by another . if this is connected with shunt.
you can see 0 ohm here that mean , it direct connected with shunt resistor.
That mean, this IPM read over current directly. by this resistor. this pin will shutdown IPM. after that. IPM will do fault out pin 0 . this pin is faultout pin . all of IPM that , I have seen. this voltage same as Microcontroller's voltage . 3.3V or 5V . This pin is pullup by that volage. this pin should have 5 or 3.3 volt. So we will see , what' the problem here. Turn ON PCB . Set multimeter at voltage. I have selected DC voltage. circuit board is ON now. you can see this blinking here. Now check the IPM voltage. Many great people say. everywhere is voltage . they work with voltage.
I agree , everything work with voltage. Our body's control with voltage also. But how to measure it , that is a big thing. Some great men. who don't know anything about it. And whatever , never misguide anyone. if you don't know, then say I don't know. anyway, one probe connect here. you have seen ,He showing here 15 voltage .
15 volt come from bootstrap capacitor' GND. these 3 capacitor's (–); connected with uvw output you can see here here is voltage 14.77 same here same here also .
We can't ckeck the Ipm with this voltage. if , anyone this pin voltage measure with AC line .that is a foolish job. anyway we were talk about fault output.
connect the meter probe GND & faultout pin . you can see 0 Voltage here . which is wrong. here should be 3.3V or 5 Voltage check the zero voltage on current sensing pin. here is 0.5V available . which is wrong. let's find , why 0.5 V is available here. if shunt resistor is bad , then begin this problem . now check voltage both side of this shunt resistor . if Ipm side only greater voltage then shunt side. That mean IPM is wrong. if shunt voltage greater then IPM .
that mean shunt is wrong. let us check you can see this voltage coming from IPM. Ipm have create this voltage. that mean IPM is bad. It have not any thermistor sensor .
this is IPM No. not any thermistor available inside of this So its testing is very easy. Now we know. IPM is bad condition we don't have this IPM right now . first at all , test here Some time micro controller pin also bad. So check voltage on this resistor.
this 100 ohms resistor connected .
I have show it. come here after it go to microcontroller . here is some mili volt 7.6 mili volt. here is some mili volt 7.6 mili volt. here is 2.4 only that mean . this from IPM So friends, this is also a way of IPM testing. we will have make video. you become a Learner. I teach you everything. without join any class..