openinverter forum

Bigpie wrote: ↑Tue Jul 12, 2022 12:14 pm I've picked one of these compressors up for £80 and started consolidating this thread into a wiki page https://openinverter.org/wiki/Mitsubish ... Compressor

20220712_131123.jpeg
Do you have the polarity of the HV connection to hand? I think from your blog, the left side of the photo is negative and the right positive.

Are we talking about the same compressor model? Mine has integrated cable into the body.
https://www.proxyparts.com/car-parts-st ... /16299422/
Polarity is determined by inverter connection. Still since device has inverter inside you can perform light bulb polarity test and you can clearly see bulb wont lit. https://openinverter.org/forum/viewtopi ... rity#p8215

Looks like mine is a slightly different version, mines from a 2018. It says EVH33M2 on the end plate. Will do the lightbulb test to verify polarity

*EDIT* Took the back off instead.

Found the correct fitments on Aliexpress https://www.aliexpress.com/item/1005001688953296.htm R134 4 curved and R134 5 curved was what I ordered, so 11.5mm and 14mm.

Bigpie wrote: ↑Thu Aug 18, 2022 11:41 am Found the correct fitments on Aliexpress
https://www.aliexpress.com/item/1005001688953296.htm R134 4 curved and R134 5 curved was what I ordered, so 11.5mm and 14mm.

Really good thanks.
I used original pipes, and had welded hydraulic joints to them to fit good hydraulic flexible hoses. Suddenly that doesnt seem like a good idea. Not because hydro hoses are bad, but as i suspect welded joints are porous to gases and it seems my system does not hold tight. I had to refill the gas once in 8 months now. We added UV pigment to gas... It works really good otherwise...
Your fittings should be even better.

I need to get a crimping tool next, will get the compressor installed when I swap to the leaf motor. I've not yet worked out how to clean out the oil from the evaporator. I'd rather not get the dash out to replace it with a new one.

Bigpie wrote: ↑Thu Aug 18, 2022 1:09 pm I need to get a crimping tool next, will get the compressor installed when I swap to the leaf motor. I've not yet worked out how to clean out the oil from the evaporator. I'd rather not get the dash out to replace it with a new one.

I found a guy with AC cleaning equipment. He took out my expansion valve, replaced it with a dud and then used a solvent at 45deg to wash out pag oil. Worked really well but was quite some man hours...300€ in the end.

Hi guys!
I am trying to run this compressor witch Arduino uno&mcp2515 but still no effects.
Sending message; 108 0B 00 1D 00 00 08 03 no response
I am receiving 388 1 2 0 0 0 0 0 0
Any ideas for noob?

GarageAdasia wrote: ↑Fri Jan 20, 2023 11:36 pm Hi guys!
I am trying to run this compressor witch Arduino uno&mcp2515 but still no effects.
Sending message; 108 0B 00 1D 00 00 08 03 no response
I am receiving 388 1 2 0 0 0 0 0 0
Any ideas for noob?

Its all in the beginning of this thread. I explain also here;
https://leafdriveblog.wordpress.com/tag/ac-compressor/

First AC compressor will need to see hartbeat telegram at 10ms:
Also Heater needs to see telegram from BMS which means HV is connected.

0x285 00,00,14,39,91,FE,0C,10 which means we are driving repeat at 10ms;

Then command telegram is at 100ms;
0x185 0B 00 1D 00 00 08 00 03

byte0 is status command, 08 means standby and 0B is start
byte2 just works with 1D signal
byte5 is RPM command from 08 (min) to 54(max)
byte7 can be 00 or 03, it does not differentate

Compressor reports at 100ms;
0x388 0x 0x 0x 0x 0x 0x 0x 0x

byte0 status, 7C start, 02 no power, 01 power present.
byte2 RPM report high byte
byte3 RPM report low byte
byte4 seems to be amp flow [current=dec value/10]
byte7 CAN status 00-No CAN, 01-CAN error, 02-heartbeat 0x285 present.
______________________________________________________________

For you compressor reports 01 means power is there, but B7 at 00 means no CAN signal because it seems you are not sending correct message.
Try sending 0x185 command, but you also need to send 0x285 telegram for compressor to work.
You can see my complete code here: https://leafdriveblog.wordpress.com/202 ... ev-heater/
Search for "void sendCANframeE()" and "void sendCANframeURGENT()" functions. There you can see how i dinamicaly control compressor RPM. Code is for Arduino DUE!

To simplify i suggest you get two arduino uno or nano boards and attach can shield to them.
Then use the code from here and modify it with desired ID and data...

https://leafdriveblog.wordpress.com/201 ... an-module/

Nano is the same code as UNO just smaller package.

Hi guys just to lob in my two pennies worth. I drive an Outlander PHEV as my daily.....(also a mechanic).....can hear the compressor on startup.....it doesn't just switch on it ramps up speed slowly..... almost sounds like it's changing gear....looks like you guys have most of this sorted out but willing (and able???) To help with any measurements CAN logs etc required.....have a/c machine if you want pressures etc...

GeneralScanner wrote: ↑Fri Feb 10, 2023 7:59 am Hi guys just to lob in my two pennies worth. I drive an Outlander PHEV as my daily.....(also a mechanic).....can hear the compressor on startup.....it doesn't just switch on it ramps up speed slowly..... almost sounds like it's changing gear....looks like you guys have most of this sorted out but willing (and able???) To help with any measurements CAN logs etc required.....have a/c machine if you want pressures etc...

Tnx for that.
I would really like to get a CAN log of one session with pressures from the machine correlated by a timestamp if you can manage it.
What i would like to get is full power on compressor and i ould like to see command and a response in CAN. In my Pug i can only get 1kW3 electrical power but i think it should give more...

Sorry only just found this....not on the forum very often.....will have a look and see what I can do....

So this is a diagnostic tool live data session that I had to screen record as it would not allow download of the data ....and a savycan recording of the exact same session.....

As you can see it ramps up to around 3000rm and then stops to avoid evaporator icing and then resumes a bit later.....this was a demand of 15C when in a 20C workshop.....