Technical Help
Batteries:
The battery management system or BMS is a computer that protects the battery. The BMS continuously draws a small amount of power from your battery. If you drain your battery and let it sit for a month or more, your battery voltage can drop below the minimum for discharging/charging and the BMS will not allow you to charge your battery. If you have ANT BMS with Bluetooth connectivity the charge port can be forced on.
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Your BMS will protect your battery from; overcharging, over discharging, drawing too much current and charging with too much current. ANT and JBD BMS protect cells from overheat.
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Batteries with Bluetooth BMS do not require the user to connect with BMS to use the battery. BMS connection allow user to view battery voltage, cell group voltages, charge/discharge current as well as all other technical parameters used to manage and protect your battery. Resetting the BMS will erase all the parameters needed for your battery to function. When accessing the BMS the user should be careful not to inadvertently change any of the parameters.
ANT BMS App for iOS & Android can be found here https://www.amdapps.com/.
JBD BMS App, search XiaoxiangBMS or SmartBMS Utility.
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Short circuit protection means the BMS will protect your battery from thermal event if there is a short circuit. Often times if the battery is immediately disconnected from the short circuit it will not cause damage to the battery itself, however the response time of the BMS is long enough that damage to the discharge port may occur and in some cases will require replacement. Batteries left in short circuit will be damaged permanently.
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The BMS is designed to work with various cell types / configurations and therefore had to be programmed for your specific configuration when the battery was built (i.e. LR2170LA 20s7p). If you connect to your BMS and select "Reset BMS" you will clear the programming and your battery will have to be reprogrammed to function again.
Chargers:
One red and one green light means your charger is in open circuit
Double green light means your charger is charging the battery
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When the cell bank with the highest voltage exceeds 4.2v, the BMS opens the charge circuit to prevent overcharging. After a short period of time the cell voltage naturally drops below 4.2v and charging occurs again until 4.2v is exceeded. This cycle takes place until the cell holds above 4.2v. Charge cycling at the end of the charging process is normal. You will see the lights and fan cycle as the charge process completes.
Fardriver Controller:
Speed and torque are programmable for each speed switch setting. This means you can independently set max speed and torque for all three switch positions. Kits come with instructions for torque and speed adjustment from your mobile device. Fardriver is compatible with both iOS and Android. Controllers are programable for many different combinations of motors, throttles, and batteries. If you purchase a kit, your controller was programmed for your specific combination. If you reset the the program, you will clear the parameters needed for your controller to function properly and it will need to be reprogrammed. Autolearn must be performed to teach the controller the motor configuration before use. Autolearn should be performed with the chain off and motor bolted down. Select the Autolearn function from the graph page, after the controller starts to beep hold the throttle at full the entire time. The motor will run rough and change directions during the process. When Autolearn is complete your motor will stop spinning, controller will beep and the app will show a throttle alarm. At this point release the throttle and Autolearn is complete. You can reassemble the chain and ride.
Kelly controller:
KVD7215ND Kelly controller is compact and delivers 200 line amps peak and up to 110 line amps continuous. The programming is simpler due to less options. Connectivity can be difficult and IOS devices are not supported.
Motors:
To prevent loosening during operation motor shafts are left handed thread.