Taupilz
Posts: 4
Joined: Sun Mar 14, 2021 1:53 am

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

Mon Mar 22, 2021 1:13 am

hi
Thanks a lot for all the good information, i will try to measure the voltage of the large capacitor with a multimeter and compare the voltage with the battery voltage to see if there is any difference between those. Maybe the capacitor has a decreased capacitance and is not 800 microfarad due to aging? if they are the same, and still the EV-ECU receives only 342, when the battery voltage is 354 at the moment, maybe i can conclude that there is something wrong with the measuring circuit.
I imagine that something similar is going on in the measuring circuit, the op-amp comparator receives about 4VDC (reduced by a factor of 90) from the capacitor, compares it with the 4VDC from the battery, and if the resulting voltage is different from 0V the output is set to "1" and then throw the P1A15 code.
is it a good idea, or waste of time??

i also see that user czerodk has posted a graph from an oscilloscope with exactly the same values that i have, 342V when charging, and 2V after discharging, strange or?

kiev
Posts: 1459
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

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

Mon Mar 22, 2021 6:42 am

There is a small cover on the MCU that allows access to the HV terminals, but I don't think that a multimeter will give any meaningful readings--you probably need an oscilloscope to see the rise time.

There is another 220uF of capacitance in the OBC that is also connected to that same point. There is a pre-charge resistor in the pack that limits the surge current during turn-on.

The question is whether there is some extra drain or leakage that is pulling down the HV at startup, or if it is a measurement signal issue.

Wonder what czerodk did to fix his problem?
kiev = kenny's innovative electric vehicle

coulomb
Posts: 272
Joined: Sun Jun 10, 2018 8:32 pm
Location: Brisbane, Australia

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

Mon Mar 22, 2021 5:44 pm

Taupilz wrote: 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 only 342, when the battery voltage is 354 at the moment, maybe i can conclude that there is something wrong with the measuring circuit.

I note that there is always some leakage / power drawn by the high voltage circuit, so the capacitor/condensor voltage will never reach exactlt the battery voltage. I believe that the pre-charge resistor is 24Ω, which is pretty low, so it should reach very close to the battery voltage. I don't know how close it typically gets, or how close it has to be before the condenser charge timeout trouble code is avoided. I would expect at least a 5% gap; it takes some 3 time constants for a capacitor to charge to 95% of the input voltage via a resistor, and that's neglecting any loads/leakage. Though the time constant here is small, around 25 ms (assuming a total bus capacitance of just over 1000 μF, or 1 mF).

I imagine that something similar is going on in the measuring circuit, the op-amp comparator receives about 4VDC (reduced by a factor of 90) from the capacitor, compares it with the 4VDC from the battery, and if the resulting voltage is different from 0V the output is set to "1" and then throw the P1A15 code.

I would think that it's just a buffer circuit, so that other parts of the circuit don't load the high value resistors. Often, both the positive and negative from the thing being measured (the capacitors in this case) are subtracted, so it's a differential amplifier. So the output is proportional to the difference between the inputs, which means proportional to the capacitor voltage. The comparison between battery and capacitor voltage would then be digitally inside the ECU (possibly the BMU but I don't know). But you may be right, it might be measuring the voltage difference between capacitor and battery (so across the main positive contactor, I think).

is it a good idea, or waste of time??

I really don't know; you'll quite possibly learn something, but be very careful with safety. You probably want a multimeter that can record maximum and minimum voltages, because pre-charge is over in well under one second. It might still not be fast enough to catch the true maximum. You will probably need special high voltage probes to use an oscilloscope safely.

i also see that user czerodk has posted a graph from an oscilloscope with exactly the same values that i have, 342V when charging, and 2V after discharging, strange or?

As Kiev has stated, the interesting question is why it goes to 2 V after the charge. Is it because the ECU decided the capacitor voltage wasn't high enough, so the pre-charge is aborted, or because the capacitor voltage was fine (maybe 342 V is high enough) and the voltage collapses because the main contactor doesn't work? [ Edit: duh, see next post. ] The latter could be because of burned contacts, failed coil, no drive to the coil, or wiring to the coil. Or it could be a failed measurement. I would not expect the capacitor voltage to collapse very quickly if the main contactor fails, unless some HV load comes on. The bleed resistors probably take at around 30 seconds to bleed the capacitor voltage to a safe level, and minutes to drop down to 2 V,
Last edited by coulomb on Mon Mar 22, 2021 5:58 pm, edited 1 time in total.

coulomb
Posts: 272
Joined: Sun Jun 10, 2018 8:32 pm
Location: Brisbane, Australia

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

Mon Mar 22, 2021 5:56 pm

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: perhaps it can turn on a fast discharger, or it does something to make the motor controller use a pulse of current, that sort of thing. If so, the 2V is not a symptom of a problem, just an expected result when that trouble code comes up.

My apologies if this was obvious, and I was just being thick.

bezzeb
Posts: 30
Joined: Thu Sep 17, 2020 5:53 am

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

Sun Apr 04, 2021 3:35 am

Hello.
Please tell me what is the size of the capacitors (С225,С227,С229,С291)
Resistor size,accuracy and power (R211,R212,R216,R219,R220,R221)
I want to order on the mouser.com website, but I don’t know which ones
thanks for answers

kiev
Posts: 1459
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

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

Sun Apr 04, 2021 8:39 am

size of the capacitors (С225,С227,С229,С231) [there is not a C291]

the dimensional size of the caps is "0805"
C227,229,231 are yellow-brown ceramics with a value of about 390 nF or .39 uF. They are all in parallel and the total across them measured about 1.22uF

C225 has a pinkish color of the ceramic (may indicate tolerance or voltage rating) and looks the same as some other caps on the board that had a measured value of about 4.7pF.
This cap is connected across the Gate to Source of FET2 [NEC 2SK3116] and i measured 2.4 nF, which is likely due to the meter charging up the FET (the Gate charge is listed as 26nC on datasheeet).

Resistor size,accuracy and power (R211,R212,R216,R219,R220,R221)

R211-220 (total of 6 in series) these are blue colored (1% tolerance?) 100k resistors, size "1206"

R221, 223,225 are blue colored 6.8k resistors, size "0805"

Let us know if you find any damaged or different part values when you take them off the board.
kiev = kenny's innovative electric vehicle

bezzeb
Posts: 30
Joined: Thu Sep 17, 2020 5:53 am

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

Sun Apr 04, 2021 12:58 pm

kiev wrote:size of the capacitors (С225,С227,С229,С231) [there is not a C291]

the dimensional size of the caps is "0805"
C227,229,231 are yellow-brown ceramics with a value of about 390 nF or .39 uF. They are all in parallel and the total across them measured about 1.22uF

C225 has a pinkish color of the ceramic (may indicate tolerance or voltage rating) and looks the same as some other caps on the board that had a measured value of about 4.7pF.
This cap is connected across the Gate to Source of FET2 [NEC 2SK3116] and i measured 2.4 nF, which is likely due to the meter charging up the FET (the Gate charge is listed as 26nC on datasheeet).

Resistor size,accuracy and power (R211,R212,R216,R219,R220,R221)

R211-220 (total of 6 in series) these are blue colored (1% tolerance?) 100k resistors, size "1206"

R221, 223,225 are blue colored 6.8k resistors, size "0805"

Let us know if you find any damaged or different part values when you take them off the board.

Thank you very much for the information
Of course, I will write which details were problematic

bezzeb
Posts: 30
Joined: Thu Sep 17, 2020 5:53 am

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

Fri Apr 09, 2021 5:10 am

are there any analogs of the ad8677 ?
I just can't find where you can buy it

Eddie49
Posts: 1
Joined: Tue Apr 13, 2021 3:36 am

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

Tue Apr 13, 2021 3:47 am

The AD8677 Op-Amps seem to be readily available on eBay.com or ebay.co.uk, priced between $5 and $10, but in some cases even 5 pcs for that price:
https://www.ebay.co.uk/itm/5PCS-X-AD867 ... 2250396538

bezzeb
Posts: 30
Joined: Thu Sep 17, 2020 5:53 am

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

Sun Apr 18, 2021 1:38 pm

Eddie49 wrote:The AD8677 Op-Amps seem to be readily available on eBay.com or ebay.co.uk, priced between $5 and $10, but in some cases even 5 pcs for that price:
https://www.ebay.co.uk/itm/5PCS-X-AD867 ... 2250396538

Thank you so much.
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