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by coulomb
Thu Apr 22, 2021 4:28 am
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC)
Replies: 673
Views: 328191

Re: Troubleshooting and repair for On-board Charger (OBC)

Matheos wrote: What is the surface mount element X501 on the top upper board near the high voltage section?

My guess is that it's the crystal for the processor on the other side of the board (IC701).
by coulomb
Mon Apr 19, 2021 5:30 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC)
Replies: 673
Views: 328191

Re: Troubleshooting and repair for On-board Charger (OBC)

Sandrosan wrote:I think these resistors blow only if there is something wrong, because I think they work just for few seconds on the precharging process of the 3 big capacitors.

Exactly. These are pre-charge resistors, If all goes well, they dissipate zero power after pre-charge because the relay is shorting them.
by coulomb
Mon Apr 12, 2021 8:09 pm
Forum: Private For Sale, Want To Buy
Topic: Wanted. Battery detector 9499D325
Replies: 4
Views: 1040

Re: Wanted. Battery detector 9499D325

In fact ,it looks like it's a different size, and the mounting holes will be different (for other readers, mine is the second photo): https://lh3.googleusercontent.com/pw/ACtC-3dkWn3xb4EOPzLs-jIA2MkvFPKTn79ChvYRbUBe0YU0qEHwX3mp6mRzQItVuJKyubvxsALYUZwm1x0ifDQOxLtsuuq-k1cbCUT_CdE2VtjYxGP97-Rfi35bktw8e...
by coulomb
Mon Apr 12, 2021 7:40 pm
Forum: Private For Sale, Want To Buy
Topic: Wanted. Battery detector 9499D325
Replies: 4
Views: 1040

Re: Wanted. Battery detector 9499D325

I have a spare one of these somewhere... I'll do a tidy up and see if it turns up. It turned up today, along with my clamp meter that I've been searching for :roll: The part number is 9499A648. Under that is G8D-803M. So that doesn't sound very promising, sadly. It has a 5-pin connector, and of cou...
by coulomb
Tue Apr 06, 2021 6:11 am
Forum: Batteries and Battery Management
Topic: Replace CMU?
Replies: 6
Views: 970

Re: Replace CMU?

i think there is a forum thread with pictures and schematics of the CMU board, i remember seeing this Yes, one by that helpful Kiev chappie :D http://myimiev.com/forum/viewtopic.php?f=23&t=4302 Edit: only a couple of partial schematics are traced, but one happens to involve the auto-numbering c...
by coulomb
Sun Apr 04, 2021 5:17 pm
Forum: Batteries and Battery Management
Topic: Replace CMU?
Replies: 6
Views: 970

Re: Replace CMU?

kiev wrote:Simon and coulomb know more about the automatic renumbering feature of the BMU.

I only know the details of how it works, at the firmware level, but unfortunately not any practical method to trigger it.
by coulomb
Mon Mar 29, 2021 8:14 pm
Forum: Batteries and Battery Management
Topic: Level One Charger Won't Charge
Replies: 11
Views: 965

Re: Level One Charger Won't Charge

Yes, earth is required for EV charging.
by coulomb
Mon Mar 22, 2021 5:56 pm
Forum: Batteries and Battery Management
Topic: No READY. P1A15 error. Condenser charge timeout.
Replies: 140
Views: 61217

Re: No READY. P1A15 error. Condenser charge timeout.

Duh. The capacitor voltage is obviously declared too low (whether it really is or not), because of the trouble code. So forget what I said about the main contactor not working. A final thought: maybe when that trouble code is asserted, the EV ECU does something to quickly discharge the DC bus: perha...
by coulomb
Mon Mar 22, 2021 5:44 pm
Forum: Batteries and Battery Management
Topic: No READY. P1A15 error. Condenser charge timeout.
Replies: 140
Views: 61217

Re: No READY. P1A15 error. Condenser charge timeout.

Maybe the capacitor has a decreased capacitance and is not 800 microfarad due to aging? If it has, it will only make the pre-charge process faster. It may have excess leakage, but I don't expect that from a film capacitor (if that's what it is). if they are the same, and still the EV-ECU receives o...
by coulomb
Sat Mar 20, 2021 4:36 pm
Forum: General Technical Discussions
Topic: Not able to drive. P1A15 error.
Replies: 34
Views: 5075

Re: Not able to drive. P1A15 error.

Charger set to charging voltage 14.40 V. After battery was fully charged, Voltage 13.15V. Does your charger do a proper absorb charge, or just stop when the battery voltage reaches 14.4 V? It should keep the battery voltage at 14.4 V or so for long enough that the charge current drops to a low valu...

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