Help! Error 07 On DCP18 Bafang Rear hub motor

[KLMVII]

Hi guys,

I have a bit of an issue and I can't seem to figure it out.

I have a 48v 750w Bafang MG60 Rear hub motor along with a 48v 12ah Hailong Battery and (what I think) is a 48V 750w controller (See Pic) However when I connect everything up I get an Error 07 High Voltage Protection Error message on the DCP18 screen. as the battery was fully charged it was showing as 53.4V so I left the battery on and the volts eventually dropped down to 46V but the error still appears.

If the battery is only producing 46v going through a controller for 48v and hitting a 48V motor and all wattage matches (I think), what is the issue? Some people are saying I need a new display, some are saying change the controller. The problem I have is that with changing the controller I cannot seem to find any controllers that provide the same Julet connectors for the kit I already have.

Any suggestions would be greatly appreciated!

 

[vfr400]

Try this: Disconnect the battery. Short the two pins that it connects to in order to discharge the capacitors in the controller. Wait a minute just to be sure, then reconnect the battery. The battery needs to be around 48v or maybe a bit less when you reconnect it.

you might get a spark when you short the battery connection. it's nothing to worry about - normal capacitor discharge.

 

[Nealh]

The controller is 48v marked for 48v nominal batteries so it should work for a 48v battery which when fully charged is 54.6v.
Does the LCD have a voltage setting where 36v or 48v has to be selected ?

 

[KLMVII]

The controller is 48v marked for 48v nominal batteries so it should work for a 48v battery which when fully charged is 54.6v.
Does the LCD have a voltage setting where 36v or 48v has to be selected ?

It doesn't unfortunately, not that I have been able to find at least. I have ordered a new KT-LCD8H display which should be able to run on a 48V so I'm going to give that a try to see if it helps. Thanks for the info

 

[RossG]

Try this: Disconnect the battery. Short the two pins that it connects to in order to discharge the capacitors in the controller. Wait a minute just to be sure, then reconnect the battery. The battery needs to be around 48v or maybe a bit less when you reconnect it.

you might get a spark when you short the battery connection. it's nothing to worry about - normal capacitor discharge.

It's quite harmless shorting a big fat Electrolytic, you just wet yourself and forget who you are for three days.

 

[wheeliepete]

I have ordered a new KT-LCD8H display which should be able to run on a 48V so I'm going to give that a try to see if it helps.

KT display will only work with a KT controller. I think your kit may have Higo connectors, not Julet, which are wired differently.

 

[vfr400]

It doesn't unfortunately, not that I have been able to find at least. I have ordered a new KT-LCD8H display which should be able to run on a 48V so I'm going to give that a try to see if it helps. Thanks for the info

You wasted your money. Do what I suggested.

 

[KLMVII]

You wasted your money. Do what I suggested.

I have managed to get the battery to 47.7V but I still have the error.

 

[KLMVII]

KT display will only work with a KT controller. I think your kit may have Higo connectors, not Julet, which are wired differently.

All connectors coming out of the controller say Julet on them, would this still be a problem with the KT display?

 

[danielrlee]

All connectors coming out of the controller say Julet on them, would this still be a problem with the KT display?

Yes. It definitely won't be compatible. You should cancel the order if you can.

 

[KLMVII]

Yes. It definitely won't be compatible. You should cancel the order if you can.

Thank you, you just saved me £80 there!

 

[vfr400]

View attachment 38081

I have managed to get the battery to 47.7V but I still have the error.

Did you do what i suggested? I'm trying to help you, but you don't seem to be in receiving mode.

 

[KLMVII]

Did you do what i suggested? I'm trying to help you, but you don't seem to be in receiving mode.

I'm not really comfortable doing that at the moment, however the battery level is now below the 48V mark, would you still suggest shorting it?

 

[vfr400]

I'm not really comfortable doing that at the moment, however the battery level is now below the 48V mark, would you still suggest shorting it?

The capicitor will keep the memory in the LCD. Why aren't you comfortable? it's harmless.

 

[KLMVII]

The capicitor will keep the memory in the LCD. Why aren't you comfortable? it's harmless.

OK, I managed to short the battery (nearly lost an eye but it's ok) unfortunately it hasn't made a difference I still have error 07. Thank you for the information though still, if you can think of anything else I can try please let me know

 

[vfr400]

OK, I managed to short the battery (nearly lost an eye but it's ok) unfortunately it hasn't made a difference I still have error 07. Thank you for the information though still, if you can think of anything else I can try please let me know

You weren't supposed to short the battery. Remove the battery and short the connections on the battery receiver - the receiver is the thing that the battery clips into. If you don't have a receiver, short whatever connection you have on the bike, not the battery.

 

[Nealh]

The battery receiver is wired to the controller so as vfr has mentioned short either the controller +/- contacts together or with the battery removed the receivers +/- contacts. A small spark as mentioned will occur but it will do no damage.
IF YOU SHORT THE BATTERY ITSELF THEN IT WILL GO BANG AND YOU END UP WITH KFF'S, UNDER NO CIRCUMSTANCE SHOULD YOU SHORT A BATTERY.