TC Charger error message on Zeva

[somfas]

I am finally getting close to completing my lithium conversion. Bench testing is going okay, until hooking up the charger. I got an error message that said Input voltage error. Also, it said the output voltage was 75v. My cart is a 72V cart with 10 Leaf Modules running 82v. I would appreciate any help on clearing this up. It is controlled by CAN so it should be pretty straight forward, I would have thought.

[DaveTM]

Is your ZEVA BMS a "BMS 16 V2" model?

If so, from what I read in the instructions on page 9, the Charger voltage parameters are 0-70V.

Do you have information that shows the parameters are different?

[PingEye3]

Originally Posted by somfas

I am finally getting close to completing my lithium conversion. Bench testing is going okay, until hooking up the charger. I got an error message that said Input voltage error. Also, it said the output voltage was 75v. My cart is a 72V cart with 10 Leaf Modules running 82v. I would appreciate any help on clearing this up. It is controlled by CAN so it should be pretty straight forward, I would have thought.

Mark, check to see if there is a place in the TC settings to choose input voltage of 120VAC. I thought that the TC was dual voltage and auto sensing of the input voltage, but I may be wrong. Seems that E36Racer had a similar issue 2 years ago on his initial startup.

[Sergio]

DaveTM, he uses the high end EVMS3 which goes to 500v on the TC charger parameter.

As I recall that issue was "cosmetic" only and it did not prevent the charger from working.

Did You verify your "charger enable" 120VAC relay was closing and providing "ground" to the EVMS3 "charger sensing" terminal?


Keep in mind that if you did not bond the 12v negative to the pack negative then "ground" refers to your 12v battery and not the pack negative.

[PingEye3]

Originally Posted by Sergio

DaveTM, he uses the high end EVMS3 which goes to 500v on the TC charger parameter.

As I recall that issue was "cosmetic" only and it did not prevent the charger from working.

Did You verify your "charger enable" 120VAC relay was closing and providing "ground" to the EVMS3 "charger sensing" terminal?


Keep in mind that if you did not bond the 12v negative to the pack negative then "ground" refers to your 12v battery and not the pack negative.

Great point Sergio and I think that is the problem. He is using a separate 12V battery for lights and for the BMS power. He will have to relocate the source of his 'ground' from pack negative to the 12V negative of the aux battery. Thank you, again.

The new and hopefully, final copy of his 72V pack wiring with Zeva EVMS3 BMS and TC Charger.

[somfas]

Thanks for the help! I swapped over the relay wire from pack voltage to 12v, but it didn't change anything.

[Sergio]

You mean you swapped the pack negative B- wire that connected to the 12Vac relay contact to the 12v battery negative wire?

If so, You need to give us more details like what is the current pack voltage and what are your voltage settings for the charger.