PMCC ‘Restricted Operation’ Error

[taymac]

I am hoping someone can help me. I am in the UK with a Taycan 4S. I don’t do a lot of miles and often charge at a local Ionity charger. When I do charge at home I have recently been seeing a “Restricted Operation” error. See picture of error message. This sometimes come up straight away or sometimes happens in the charging cycle (see screen shot). I have 3 phase supply at home, and this error seems to drop my charge rate from 11 kw/hr to 7 kw/hr. To clear it I unplug the PMCC and then throw the trip switches off for the three phase — wait for a number of minutes then switch everything back on and it has cleared.

Note: I have tried pressing the power button for 10 seconds but this doesn’t seem to do anything

Has anyone else seen this? What is causing it? What can I do to prevent it coming back?

I am not on top of all the charging technology so would really appreciate a PMMC Restricted Operation Error “guide for idiots”

Many thanks for any input that anyone can give me.

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[taymac]

Can anyone please help with this issue? Thanks

 

[W1NGE]

I am hoping someone can help me. I am in the UK with a Taycan 4S. I don’t do a lot of miles and often charge at a local Ionity charger. When I do charge at home I have recently been seeing a “Restricted Operation” error. See picture of error message. This sometimes come up straight away or sometimes happens in the charging cycle (see screen shot). I have 3 phase supply at home, and this error seems to drop my charge rate from 11 kw/hr to 7 kw/hr. To clear it I unplug the PMCC and then throw the trip switches off for the three phase — wait for a number of minutes then switch everything back on and it has cleared.

Note: I have tried pressing the power button for 10 seconds but this doesn’t seem to do anything

Has anyone else seen this? What is causing it? What can I do to prevent it coming back?

I am not on top of all the charging technology so would really appreciate a PMMC Restricted Operation Error “guide for idiots”

Many thanks for any input that anyone can give me.

Get your electrician back as this is probably due to poor grounding and / or overheating.

What ampage, and cabling do you have from your fuse box?

 

[taymac]

Get your electrician back as this is probably due to poor grounding and / or overheating.

What ampage, and cabling do you have from your fuse box?

Hi W1NGE, Thanks for the comments. See below — it runs at 15.8 Amps. I don’t know the exact cable they used running from the fuse box. The cable is shown below, it is about 3/4 inches thick if that helps.

 

[W1NGE]

Hi W1NGE, Thanks for the comments. See below — it runs at 15.8 Amps. I don’t know the exact cable they used running from the fuse box. The cable is shown below, it is about 3/4 inches thick if that helps.

To get 7.4 KW on single phase you will need a dedicated 32A supply from the fuse box, 32A rated cable, a 32A receptacle and the 32A connection from from the receptacle to your PMCC.

If you have 3 phase then clearly you'll need 30 amps per phase.

Your PMCC is capable of delivering 22KW to the car but if you don't have the 22KW AC onboard charger in the car then you will get 11KW max.

I can't remember if the red connector is 16A or 32A - check your spec sheet for your build. I suspect it is 16A (and blue for 32A) hence part of your issue and you are only getting half of what you should.

Check also the ampage setting on the PMCC via the dedicated web interface (WiFi or hotspot).

 

[taymac]

The setting on the PMCC is 32A. Just checked the red commando socket and it is marked as 32A. I don’t have the 22KW onboard charger. The problem I have is that sometimes the charger charges at 11KW (which is the max the car will take) and then after a variable time it drops to c. 7KW and then I also get the “Restricted Operation” error message. But it is very intermittent - I charged yesterday and had no problems this time.

I really appreciate your input - I think I will get the electrician back out to check it over.

 

[Scandinavian]

The setting on the PMCC is 32A. Just checked the red commando socket and it is marked as 32A. I don’t have the 22KW onboard charger. The problem I have is that sometimes the charger charges at 11KW (which is the max the car will take) and then after a variable time it drops to c. 7KW and then I also get the “Restricted Operation” error message. But it is very intermittent - I charged yesterday and had no problems this time.

I really appreciate your input - I think I will get the electrician back out to check it over.

Do you have any possibility read the supply voltage on your three phases?? You should ask your electrician to check the lines when charging at full power.

By the looks of it you have 32 amp CEE plug and socket installed. At 11 kW you will draw a maximum of 16 amp per phase which should not give this problem.

It could be that there is so much load on one of your phases that the supply voltage differs to much between the phases when you run at 16 amp/phase. Have you got any other heavy draw equipment connected on one or more phases. An electrician can verify easily and perhaps check that all phases and connections are properly torqued.

 

[taymac]

Thanks for your feedback. I am waiting for the electrician to come out to have a look at the set-up and will show him your comments.

 

[OzzieT]

Hi @taymac. Thanks for your post, I'm experiencing similar issues. I've just taken delivery of a GTS with 22kw on board. Three phase charging at home is very problematic. Similar issue to you if I reset the charger then it seems to get the three phase going again. This is on a non-Taycan charger. Let me know if you have any luck in solving.

 

[taymac]

Hi OzzieT, I had the electrician out last week and he checked the installation over. He is happy that the install is good (I have three phase in my house) and he reckons that the problem might be that the incoming electricity supply is varying from the grid causing the charger to think that the supply within the house is being overloaded and the charger drops from 11KW (max I can get on my car) to 7.6KW which is the single phase charge I would get. The only other thing he can think is that there could be a problem with the PMCC and I would need to talk to Porsche about it.

We agreed that I would watch the next few charges and see if the charge rate drops and then steps back up which could indicate an incoming supply problem and I should talk to the electricity supplier. If the charge rate drops and stays down I should talk to Porsche as he reckons that it could therefore be the Porsche charger at fault.

Note: my problem is that I don’t do a lot of miles and therefore don’t charge often and I also charge at Ionity for high speed charging — therefore I don’t get a lot of data on at-home charging.

It’s interesting that you mention you have the same problem - but you don’t use the Porsche PMCC charger. This would say that it could be variation on your incoming electricity supply or ‘maybe’ the car is pushing the charging rate to drop from 11KW (22KW for you) down to single phase 7.6KW charging rate.

I should also say it is a very intermittent issue for me. The last two charges at home ran smoothly at 11KW and I then start to think that the problem has resolved itself.

Please let me know if you find out anything else and I will also keep you updated if I get anywhere with this issue. ?

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