Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

[budm]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

Some info I found about Panasonic Inverter compressor:
http://web.mit.edu/parmstr/Public/x/...onsumption.htm

[stj]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

i doubt most meters will give decent readings on a high frequency drive.

[sam_sam_sam]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

I see a couple of problem with the power to the compressor
The compressor data label clearly state that the voltage is 240 volts
Why are you only getting 160 volts number one
Why is your amperage look low to me this might be issues number 2

Issues number 3 is you say that when the compressor run it is not very cool and the heat comes from the condenser coil is not very hot I being to think that something might be wrong with the compressor or your meter device or you might have a gas leak

Does this unit have a data plate on it if it does can you post a picture of it

[sam_sam_sam]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

The only one with heatsink is this giant one labelled IMP301 on the board. The only IGBT I can see but without heatsink is MIP414MD

IMP301 part is not a good part number

The MIP414MD is a good part number but it a some kind-a power switching power supply regulator

You have not found something like a IGBT module module mount in the case some where

[Per Hansson]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

Here's the link for 1 such pic that caused this error: https://we.tl/t-lLIq3zXP41

** I just did a resized from 15mb to 4mb, then it loads OK.

Sorry for the delay, I have changed the PHP settings to allow larger files to upload.
I tested with your linked picture and it works fine now.
But this one was 4MB, does the 15MB version upload fine too now or does it still error out?

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

I only have 2x 40 watts bulbs. Can I wire them in series and connect the 2 ends at any 2 of the 3 pins like in the pic below?

[sam_sam_sam]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

How bright do the light bulb get this amperage seems a little low

Can you do this test with 100 watt bulbs if possible

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

Now you need to know if the amperage is the same on three legs with the lights bulbs and with the compressor

Not all amp probes are the same when it comes to reading VFD drive output because of the waveform that a VFD drive has some of can not read it

But if your amp probe can read it there should not be more than 10% different between legs

If the test results are very close to the same then it could be that the compressor has issues or you have a seal system fault of some kind

Or

You could have a problem with the inverter not working correctly

I only have 2x 40-watt bulbs, and could get another to try. So I wire up my DMM in series, without the bulbs, with each of the 3 pins, one at a time:

_______________start-up_____1-minute later
Pin 7(W):_______~0.265A_____~0.235A
Pin 9(V): _______~0.258A_____~0.223A
Pin11(U):_______~0.276A_____~0.210A

So all the pins started a little higher, and lowered down a little bit after a minute or so.

Are these readings valid? And of so do they look normal?

[sam_sam_sam]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

Thank you for confirming the wiring diagram.

I have done the reading across each leg:
1) 1 & 2: 160.x vac
2) 1 & 3: 160.x vac
3) 2 & 3: 160.x vac

I did it once only but taken a few readings over a few minutes. Each time the readings are about the same.

Just to be sure:
I inserted a straighten paper-clip each into pin 7, 9 and 11, and measure the voltages across 7 & 9, 7 & 11, 9 & 11. Hope this is correct way to measure them.

Now you need to know if the amperage is the same on three legs with the lights bulbs and with the compressor

Not all amp probes are the same when it comes to reading VFD drive output because of the waveform that a VFD drive has some of can not read it

But if your amp probe can read it there should not be more than 10% different between legs

If the test results are very close to the same then it could be that the compressor has issues or you have a seal system fault of some kind

Or

You could have a problem with the inverter not working correctly

[stj]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

the lamps are in series-pair so you would need more than 480v to damage them.

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

Yes you could do that way as long as the voltage rating on light bulbs is above what the voltage of compressor would see

I would still read the voltage across each leg

1 and 3 / 2 and 3 / 1 and 2 the voltages should be no more than 10% different from each other unless there is a high leg

Thank you for confirming the wiring diagram.

I have done the reading across each leg:
1) 1 & 2: 160.x vac
2) 1 & 3: 160.x vac
3) 2 & 3: 160.x vac

I did it once only but taken a few readings over a few minutes. Each time the readings are about the same.

Just to be sure:
I inserted a straighten paper-clip each into pin 7, 9 and 11, and measure the voltages across 7 & 9, 7 & 11, 9 & 11. Hope this is correct way to measure them.

[sam_sam_sam]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

Yes you could do that way as long as the voltage rating on light bulbs is above what the voltage of compressor would see

I would still read the voltage across each leg

1 and 3 / 2 and 3 / 1 and 2 the voltages should be no more than 10% different from each other unless there is a high leg

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

you could wire them so one end of each lamp is joined, and the other end is hooked to the V,W & U signals like in the diagram,
that would be pins 7,9 & 11

Pardon me for being extra cautious as I am quite terrified of high voltage wiring - please help confirming the wiring is correct per your description.
Thank you.

[stj]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

you could wire them so one end of each lamp is joined, and the other end is hooked to the V,W & U signals like in the diagram,
that would be pins 7,9 & 11

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

maybe you could use 3 lamp bulbs in parallel to the compressor coils to see if all 3 are being driven.

I would, if you could kindly draw me diagram on how to wire them up, and presumably using 40w-100W incandescent bulbs?

I should expect to see these bulbs flickering indicating varying power driving the compressor?

[stj]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

maybe you could use 3 lamp bulbs in parallel to the compressor coils to see if all 3 are being driven.

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

The only one with heatsink is this giant one labelled IMP301 on the board. The only IGBT I can see but without heatsink is MIP414MD.

The 3 compressor pins all has resistance of 9.4 ohm between them. When powered up, all has around 160.3-5 between them.

I have powered up the fridge, and turned on the quick freeze function, and the freezer control to max. The compressor started up with normal low temperature, low vibration and low humming sound. After about 30 minutes, it became quite hot (but not too hot to touch) with medium pitch whining sound, but vibration remained low.

The inlet and outlet tubes to and fro the compressor both feel slightly hot and slightly cold respectively. Evaporator fan is running. Can feel the refrigerant flowing through when placing fingers onto the evaporator coil, but not cold at all.

I gave the compressor a few bangs with a gloved fist, the whining pitch seemed to have lowered, then returned to same level after a short while.

[sam_sam_sam]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

OK

I have repaired VFD drive before

This has to have a IGBT module some where on that board more than likely there is a heat sink on top of it post the part number of it

Try reading the voltage on terminals 1 and 3 / 2 and 3 / 1 and 2 on the compressor terminals

The voltage readings should be very close to each other

If you can not get a stable reading then try read the input voltage at board if you do not get a stable reading there then you have some problem at IGBT module

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

The board looks like tropical rain forest to me...

Are you able to point it out where do I start checking?

[stj]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

or fix the board?