[RIPPERTON]

Having custom ordered the wrong voltage charger, was left with the only option of shipping the charger back to China to have it adjusted but thanks to Ian Bruinsma here in Sydney was able to make the voltage adjustable.
Originally the voltage cut off at 80.1v (LiFePo4 24s 1p 72v 8Ah)
This charger is for my Giant MTB with hub motor.
Putting a trim pot and resistor in was able to make the output DC voltage adjustable from 83v to 89v. Ideally it should cut out at 87.6v for 3.65v each cell but I still havnt got a BMS for this battery yet so have left it at its minimum 83v.
Ian is starting to convert a Smart car to AC drive so you might find him around here asking questions so help him out if you can.
cheers Ripperton

[DIYguy]

Originally Posted by RIPPERTON

Having custom ordered the wrong voltage charger, was left with the only option of shipping the charger back to China to have it adjusted but thanks to Ian Bruinsma here in Sydney was able to make the voltage adjustable.
Originally the voltage cut off at 80.1v (LiFePo4 24s 1p 72v 8Ah)
This charger is for my Giant MTB with hub motor.
Putting a trim pot and resistor in was able to make the output DC voltage adjustable from 83v to 89v. Ideally it should cut out at 87.6v for 3.65v each cell but I still havnt got a BMS for this battery yet so have left it at its minimum 83v.
Ian is starting to convert a Smart car to AC drive so you might find him around here asking questions so help him out if you can.
cheers Ripperton

Thanks Ripper! you never know. I stuffed it away in my charger file. I have a 6 kw Elcon set up for 192 volt AGM's. Lithium is in my future and it will have to be modified.... but I was wondering about this also...

[SmartArseEV]

OK - It was me... I am now visible as SmartArseEV...

Thanks RIPERTON for the acknowledgment.

This was not my best work (it was a quick and nasty modification), but it was worth posting. If it helps any of you EV converters out there well excellent!

[Dougnutz]

Originally Posted by RIPPERTON

... was able to make the voltage adjustable.

OH! thank you thank you, this is exactly what I needed

[FWD]

Originally Posted by RIPPERTON

Having custom ordered the wrong voltage charger, was left with the only option of shipping the charger back to China to have it adjusted but thanks to Ian Bruinsma here in Sydney was able to make the voltage adjustable.
Originally the voltage cut off at 80.1v (LiFePo4 24s 1p 72v 8Ah)
This charger is for my Giant MTB with hub motor.
Putting a trim pot and resistor in was able to make the output DC voltage adjustable from 83v to 89v. Ideally it should cut out at 87.6v for 3.65v each cell but I still havnt got a BMS for this battery yet so have left it at its minimum 83v.
Ian is starting to convert a Smart car to AC drive so you might find him around here asking questions so help him out if you can.
cheers Ripperton

is it still working? no problems over time of use?

i am going to do this mod to mine is 292 volt max and i need 262 so i do the down adjustment

[FWD]

double post

[FWD]

ok my elcon with 292 end voltage is not the same
between pin 2 and dc+ there is not 75k ohm but 600k ohm.

i geuss thats because the voltage is higher

so the 10x R1 of 75kohm to lower the voltage wil not work.

but is it 10 x 600kohm so 6Mohm or something else?

[Otmar]

Has anyone figured out how the Elcon charge profiles are changed?

I've heard that it may be possible through a serial interface inside the charger. I've done a little research, but am not getting too far. In case it helps the others this is what I have figured out:

My charger board is a TCCH1K5W A ver 1.4
It has a 5 pin header for which I assume is for programming profiles.
It has a NXP 89LPC938FDH uC near the connector, this shares battery pack ground.
As best I can tell working around the potting:

Pin 1 = VCC 3.3V
Pin 2 = RST pin 6 on uC, 105K to gnd
Pin 3 = Pin 23 on uC, 10K to gnd
Pin 4 = Pin 22 on uC, 15K to gnd
Pin 5 = Gnd.

None of the pins send out data when powered up, and Pins 3 and 4 maintain the approximate resistance to ground (they seem to be inputs when powered up).

I suspect they may be programming the whole chip through a bootloader, but these are not the pins that NXP uses for that.

I would buy a number of these chargers if I could adjust them myself, but as it is I'm very hesitant since my pack voltages tend to vary. If anyone has ideas for reprogramming the profiles, I'd love to hear them. In the end, once my BMS is done I may just order them turned all the way up and use the analog or CAN inputs to regulate the finish charge.

[Coulomb]

Originally Posted by Otmar

In case it helps the others this is what I have figured out ...

Thanks for the info, Otmar.

... I may just order them turned all the way up and use the analog or CAN inputs to regulate the finish charge.

My understanding is that the CAN versions are very different from the others, and have *no* profiles built into them. You have to provide the instantaneous voltage and current limits yourself. If you like, the CAN versions are "turned all the way up" from the factory.

Until recently, I did not believe that the CAN versions listen to the analog control signal. So we're not planning on using it at all. Something I read recently seemed to contradict that. Anyone know for sure? We have a pair of 410 V CAN version chargers, so I could do some experiments, but exploring the charger internal workings, while interesting, is way down the priority list at present.

[bjfreeman]

Originally Posted by Otmar

Has anyone figured out how the Elcon charge profiles are changed?

not familar

My charger board is a TCCH1K5W A ver 1.4
It has a 5 pin header for which I assume is for programming profiles.
It has a NXP 89LPC938FDH uC near the connector, this shares battery pack ground.
As best I can tell working around the potting:

Pin 1 = VCC 3.3V
Pin 2 = RST pin 6 on uC, 105K to gnd
Pin 3 = Pin 23 on uC, 10K to gnd
Pin 4 = Pin 22 on uC, 15K to gnd
Pin 5 = Gnd.

None of the pins send out data when powered up, and Pins 3 and 4 maintain the approximate resistance to ground (they seem to be inputs when powered up).

I suspect they may be programming the whole chip through a bootloader, but these are not the pins that NXP uses for that.

this is known as JTAG and is used to program the code to run the micro. unless you have the ability to compile the code do not use these.

I would buy a number of these chargers if I could adjust them myself, but as it is I'm very hesitant since my pack voltages tend to vary. If anyone has ideas for reprogramming the profiles, I'd love to hear them. In the end, once my BMS is done I may just order them turned all the way up and use the analog or CAN inputs to regulate the finish charge.

I am not sure of the Can messages, I would need to see the stream an reverse engineer it base on what I know. here is what I use CanCharger spec