Crank drive stopped working – troubleshooting help please

[oxonchris]

Hi,

I’m hoping there might be somebody with Sunstar ibike experience here (it’s a Japanese crank drive system that is now out of production)?

My Sunstar battery only gives me a few miles range now so I bought a new x-go 24v battery from ebay and soldered it in a couple of days ago*, initially it seemed to work fine so I took it for a ride.
Unfortunately I caught my rear wheel in a pothole which ripped the tyre/tube and damaged the rim so I had a long walk home!

When I had the bike up on the stand at home I just tried to turn on the ibike as usual via the controller and it now doesn’t work. It shows a single flashing red light on the controller which according to the manual is a ‘Battery fault’ – so I was blaming the issue on the x-go battery.

I have since swapped my old Sunstar battery back, which I know works but with poor range, and I get the same flashing light.
Any thoughts on troubleshooting?

I am now wondering if the ibike motor took a knock when I hit the pothole although I can’t see any obvious damage (unlike my wheel!).

Many thanks,

Chris

 

[Nealh]

The issue likely is to do with the rear wheel one would suggest as it was fine prior to this.
Does it have a separate wheel sensor /spoke magnet ? If so make sure it isn't damaged or the spoke magnet is missing or out of alignment.
Was the motor damaged or in contact with the ground ?

 

[vfr400]

Some useful info here if you find out the controller's knackered. Though I wouldn't use the controller he did. You need a KT controller because you need current control for a crank motor. His is speed control.

Bringing the Sunstar S03 mid drive motors back from the dead

Electrifying the Dummy part 1 So a few weeks ago we received an email from Antony and Celia who had a very interesting proposal. They had 4 broken SunStar S03 Mid drive motors that they had been do…

empoweredpeople.co.uk

 

[oxonchris]

Hi @Nealh, thanks for the suggestions but I don't have wheel sensor /spoke magnet and I'm reasonably sure that the motor didn't hit the ground. The problem occurs as soon as you turn on the system at the handlebar control - one flashing LED which the manual tells me is a battery fault.
Last night I reconnected my old Sunstar battery which works I'm sure (has a limited range), exactly the same fault reported.