Stock Ultra settings and Programming guide Follow

By proceeding with the following you are acknowledging that you are following these instructions carefully and in full. Biktrix is not liable for any changes being made resulting in corruption of the motor controller. Warranty may be void if you program your motor yourself. Check with a Biktrix technician before making undocumented changes to these settings.

Note: If you do not have a program to open .ZIP files on your computer visit the WinRAR website and download + install the following program.

Note: The application software is in the link below, you would need to use this application for programming torque parameters- Controllerst_torque.exe

Always take screenshots of all the tabs after you have clicked on the 'READ' button and save them in a folder with a proper name this will help you to go back to previous settings if the new settings are messed up.

A. Basic tab:

Remember to click "Read" on each screen to read settings from motor.

1. Low Battery Protect(V): This is the low voltage cutoff. For a 48V battery, it is recommended to leave this at 43V. For a 52V battery, leave this at 47V.
2. Limited Current(A): 30A for 1000W, 25A for 750W, 20A for 500W. Note that BBS02 won't let you set this to over 25A.
3. Limit Current(%) and Limit Spd(%): We like to set these to ramp from 0-100 in increments of 10 for Current% and leave all Spd% at 100. This means that lowest assist would have 10% of the current limit (3A) while highest assist would have 100% current limit. If you set a limit on spd, then each time you reach a particular speed, the motor would cut power. For example, if your top speed is set to 32kph, and if Assit1 spd% is set to 10, then if the bike reaches 3.2kph, then the motor would stop assisting in level 1. This is not desirable. 
4. If you want more aggressive assist, then you can set the current% to larger increments as shown in the screenshot below.
5. If you want a more smoother level 1 assist, reduce Assit0 Current% to 4-10.
   1. Note that Assit0 is a special variable. Setting Assit0 Current% to 1 and Spd%  to 1 along with "Designated Assist level=9" in Throttle Handle would enable throttle on all levels to full power including assist level 0.
6. Speed Meter Mode, and SpdMeter setting can be left at default.

B. Pedal Assist Tab:

Remember to click "Read" on each screen to read settings from motor.

1. Pedal type: leave this as default
2. Disignated Assist, Speed Limited: leave this "By Display's command" so that you can change settings on the display.
3. Start Current%: This variable is very important so that you don't burn the controller. If this value is set to a low percentage, then it is less strenuous on the motor. Set this to 1-10% and you'll have smooth pedal assist acceleration from standstill. Set it to 100% and you'll burn the controller beyond repair.
4. Slow-Start Mode(1-8): Controls how fast the power ramps up. Set this too low and you'll burn the controller. Set it too high and PAS will be jerky. We recommend setting this anywhere between 3-5.
5. Startup Dgree(Signal No.): Determines how soon the assist kicks in. 24 a full revolution. We recommend setting this between 2-4. 2 will provide assist right away (30 deg pedal stroke), 4 will provide the assist after approx 60degree pedal stroke.
6. Work Mode (angular Speed of Pedal/wheel*10): Leave default
7. Time of Stop(x10ms): Determines how quickly the motor stops once you stop pedalling. Recommended setting 5-20. 
8. Current Decay(1-8): Determines at how high of a pedalling RPM the motor starts backing off the power. The recommended setting is 4-8.
9. Stop Decay(x10ms): the amount of time the system takes to cut after pedaling stops. Lower is faster. Recommended to set to 0.
10. Keep Current(%): Ramp current setting. Recommended 30-80. 30 will make the motor more efficient at higher speeds, 80 will make it use more battery.

C. Throttle Handle:

1. Start Voltage(x100mv):  The is the throttle input starting voltage, the point at which the controller responds to input is at 1.1 volts, so set value to 15 which = 1.5 volts. As you begin to roll on the throttle the voltage moves up from zero and when it reaches 1.5v the motor begins to turn. Best to leave between 10 and 15. Too low and the display will throw an error as the motor will want to run continuously. If you change the throttle you will need to find the new lowest setting. We recommend 11 to 15. 11 for more instant throttle engagement. 15 for more throttle movement from 0.
2. End Voltage(x100mV): You can set the max range to 42 which is the max input the controller accepts from throttle input 4.2v. If you set lower than this value your throttle response is not as linear or smooth as it could be. We recommend 35-40.
3. Mode: Switching this to Current Mode (instead of Speed mode) has an improvement in the throttle response smoothness. Speed mode makes the throttle more aggressive. Some riders prefer that.
4. Designated Assist: This setting if set will override the Limit Speed setting on the Basic Tab and also overrides the speed limited on the Basic Tab. If you set this to 9 be aware that you can and will fry your controller if you are in too high of a gear on too steep of a hill and you peg the throttle. Recommended setting 6-9. 9 only for advanced users who know how to use bike gears appropriately.
5. Speed Limited: Set this to 32-40kph. Using Display setting here will cause severe lag in throttle response.
6. Start Current(%) : 5-10 gives a much smoother startup. This can be set all the way down to 1, great for IGH bikes and smoothing out power delivery. Do not set to values higher than 10.

 D. Torque: we will cover this in a different post. Users don't need to make changes to this tab.