Hi:
I have a 72 volt QS motor electric scooter with lithium power system.
Recently the motor stopped spinning. After checking a few things it sure seemed like the controller was bad because the power going into the controller was not the 64 to 84 supplied by the batteries.
I've been through three controllers now and I'm a little stumped.
The 1st purchased replacement was a Risun so that I could get regenerative braking. (I installed a similar controller a couple years back on a 36 volt system)
Well the same condition occurred, with not full voltage power going into the controller. The included display was showing error 7 which was power not being applied to the motor if I recall correctly? Before I sent the controller back I had plugged in a 48 volt and the system function properly. It was a little unusual for me to plug 48 volts into my 72 volt system, but I was really concerned that something with the motor or the hall sensors was an issue.
I next purchased a Votol controller kit (72300s, an EM 75s) as both Votol and Fardrive appeared to be designed for use with QS motors.
The same situation occurred when I applied the battery voltage to the controller, the controller wasn't accepting it. More research (here) I discovered I needed to connect the electric lock line (I would call it ignition) to the power. At this point I'm thinking this controller's defective also, as doing research it appears that the EM75s are not being made in China, they may be being made in another Asian country not sure...0 so I ordered an inexpensive controller which came today.
When I went out to take videos this morning in order to send the Votol unit back - the battery voltage was pretty low (it had been above 75 on all previous testing (3 weeks) from a fully charged 84) so I plugged in the charger and I was setting up for my voltage testing for the video. I turned it on, twisted the throttle and it functioned. Disconnecting the charger gets about a second of the motor engaging and then voltage goes to near 0.
So now I'm really unsure about what's going on. I connected 48 volts again and it works without any issues. This appears to point to my battery but the batteries just a couple years old, been kept in pretty good shape. I'm currently charging a couple of 36s that I'll create a connector for (tomorrow) to put them in series and test the system to try to eliminate the original battery pack, but I wondered if anybody has any other possible solutions or answers, either testing or could I really have had three bad controllers?
I have a 72 volt QS motor electric scooter with lithium power system.
Recently the motor stopped spinning. After checking a few things it sure seemed like the controller was bad because the power going into the controller was not the 64 to 84 supplied by the batteries.
I've been through three controllers now and I'm a little stumped.
The 1st purchased replacement was a Risun so that I could get regenerative braking. (I installed a similar controller a couple years back on a 36 volt system)
Well the same condition occurred, with not full voltage power going into the controller. The included display was showing error 7 which was power not being applied to the motor if I recall correctly? Before I sent the controller back I had plugged in a 48 volt and the system function properly. It was a little unusual for me to plug 48 volts into my 72 volt system, but I was really concerned that something with the motor or the hall sensors was an issue.
I next purchased a Votol controller kit (72300s, an EM 75s) as both Votol and Fardrive appeared to be designed for use with QS motors.
The same situation occurred when I applied the battery voltage to the controller, the controller wasn't accepting it. More research (here) I discovered I needed to connect the electric lock line (I would call it ignition) to the power. At this point I'm thinking this controller's defective also, as doing research it appears that the EM75s are not being made in China, they may be being made in another Asian country not sure...0 so I ordered an inexpensive controller which came today.
When I went out to take videos this morning in order to send the Votol unit back - the battery voltage was pretty low (it had been above 75 on all previous testing (3 weeks) from a fully charged 84) so I plugged in the charger and I was setting up for my voltage testing for the video. I turned it on, twisted the throttle and it functioned. Disconnecting the charger gets about a second of the motor engaging and then voltage goes to near 0.
So now I'm really unsure about what's going on. I connected 48 volts again and it works without any issues. This appears to point to my battery but the batteries just a couple years old, been kept in pretty good shape. I'm currently charging a couple of 36s that I'll create a connector for (tomorrow) to put them in series and test the system to try to eliminate the original battery pack, but I wondered if anybody has any other possible solutions or answers, either testing or could I really have had three bad controllers?