June 26, 201510 yr So, my ebike won't turn on as it's getting no power. My battery, which is of this type (below), appears (I will admit to not being an expert here) to have a problem with the on/off switch in that it illuminates for a few milliseconds as the button is depressed, but doesn't stay on. There is also no voltage reading at the power terminal. http://g04.s.alicdn.com/kf/HTB1MFV6FVXXXXXGXXXXq6xXFXXXK/221513156/HTB1MFV6FVXXXXXGXXXXq6xXFXXXK.jpg Any suggestions as to what I should do next to determine where the problem is as my electrical knowledge is poor at best?
June 26, 201510 yr Does the switch latch in and out, or does it just spring back? You are pressing it far enough in?
June 26, 201510 yr Author Does the switch latch in and out, or does it just spring back? You are pressing it far enough in? The centre of the button is recessed in the on position and returns to flush with the outer ring in the off position
June 26, 201510 yr The only thing you can do now is open it up to find the problem. when you get it open, please show us a photo of the BMS.
June 27, 201510 yr how about emailing the supplier and ask for advice? they may have a repair centre in Europe.
June 27, 201510 yr Author The only thing you can do now is open it up to find the problem. when you get it open, please show us a photo of the BMS. Photo 1 Photo 2 d8veh, if you need any different angles or close ups let me know
June 27, 201510 yr One from further out would be better so that I can see the whole layout. Which connector does the switch go to? Is photo 2 the USB module? Is that red LED on all the time or does it go off with the switch?
June 27, 201510 yr Author One from further out would be better so that I can see the whole layout. Which connector does the switch go to? Photo 3 Photo 4 Is photo 2 the USB module? Is that red LED on all the time or does it go off with the switch? Yes, and on all the time.
June 27, 201510 yr That's weird. It woild flatten the battery if you didn't charge it for a long time. Can you see it from the outside of the battery? Try shorting the switch, which I guess is the pins with the white and yellow wires. With it shorted, check the voltage on the output.
June 27, 201510 yr Author That's weird. It woild flatten the battery if you didn't charge it for a long time. Can you see it from the outside of the battery? No, it surprised me too. Try shorting the switch, which I guess is the pins with the white and yellow wires. With it shorted, check the voltage on the output. Not 100% sure where you wanted me to short the switch so exposed the terminals on the switch and stuck a small bolt between them. Still no reading on the output. P.S. USB socket provides power but battery indicator light on side of case shows 1 of 4 LEDs.
June 27, 201510 yr No, but if it's only showing one light, it implies low voltage. Can you measure the voltage between the red and black power wires from the cell-pack where they attach to the BMS?
June 27, 201510 yr You need to check the charger output voltage, which should be 42v. Next, measure the voltage on the charge socket, which isn't easy. I do it with a spare jack plug that has just two empty wires attached to it. If it shows zero volts, you need to follow the wires from the charge socket to the BMS. Measure again on the BMS and check any fuses along the way.
June 27, 201510 yr Author The charger went red for a while, but has now returned to green. I'll leave it overnight and then do as you suggest
June 28, 201510 yr Author You need to check the charger output voltage, which should be 42v. 41.6v Next, measure the voltage on the charge socket, which isn't easy. I do it with a spare jack plug that has just two empty wires attached to it. If it shows zero volts, you need to follow the wires from the charge socket to the BMS. Measure again on the BMS and check any fuses along the way. The charge socket did show zero. I followed the wires from the socket (two red & two black) back to a terminal on the BMS (see below). There were no fuses between the socket and the BMS. I tested the voltages between all combinations of the pins the red and black wires went to and again, zero. Photo
June 28, 201510 yr Did you try unplugging and reconnecting that connector. When it's out, check the voltage between one red and one black pin. If still zero volts, the charge mosfet is switched off for whatever reason,
June 28, 201510 yr Author Did you try unplugging and reconnecting that connector. When it's out, check the voltage between one red and one black pin. If still zero volts, the charge mosfet is switched off for whatever reason, Yes I did, and still zero. Apologies, charge mosfet? What does that mean, and is that it for my battery?
Join the conversation
You are posting as a guest. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.