Cycle Analyst Temporary Instructions The formal user manual for the Cycle Analyst is not yet complete, but in the meantime I will address the most common questions and setup queries here. The basic operation (Resetting and Display Screens) of the Cycle Analyst is pretty much identical to the original DrainBrain, so those sections of that manual still apply. However, the setup procedure has been entirely revamped. As with last time, you enter the setup menu by holding the button down while the meter is being turned on. If one holds the button during the "Cycle Analyst V2.0" splash screen, then instead seeing volts, watts, speed and all that, you'll see the words "SETUP" across the top of the LCD. Basic Setup Menu: Navigating through the setup options is now fast and intuitive. The one button interface works as follows: · Pressing the button toggles like an arrow key. · Holding the button down until _OK appears in the bottom right corner is like pressing enter. For instance, if you want to calibrate the wheel size for your bicycle, then press and hold the button until _OK is displayed in the bottom right corner. At that point, the first digit of the wheel size will flash. Press the button briefly to toggle through the digits or hold the button to save it and move on to the next digit. Once all 4 digits have been saved, then the display will move to the next setup item. The main setup menu allows you to toggle through 6 items: - Set Units - Select between Kilometres or Miles. (default: km) - Set Wheel Size - Set the circumference of your tire in mm. This is necessary for speed and distance readings to be correct (default: 2075mm). For highest accuracy this should be measured directly, either by measuring the diameter and multiplying by 3.14, by marking off one rotation on the ground, or by riding a trip of known distance and then adjusting the circumference so that the distance reads correctly. - Main Display - Choose whether you want Watts or Amps to show on the primary display screen (default: Watts). The following three items only apply to Cycle Analysts which have been wired with the throttle override signal connected to the motor controller. This includes all direct plug Cycle Analysts. Without that connection, these values can still be set but will have no effect: - Volts Limit - Program the low voltage rollback point for your battery pack (default: 19V). The Cycle Analyst will reduce power drawn from the controller in order to keep the battery voltage from dropping below the limit. - Max Amps - Set the upper current limit (default: 50A). If the Cycle Analyst senses current above this value, it will attempt to reduce the current by scaling down the throttle override signal. - Speed Limit - Set the maximum speed beyond which the motor controller will cease to provide useful output power. Advanced Menu At the end of the main setup screen, the message "ADVANCED" appears across the LCD. Press the button briefly to skip this and the meter will resume normal operation. To enter the advanced options, hold the button until _OK appears in the bottom right. The following items are available to modify in the advanced menu: Range Mode: There are two current ranges that can be set up depending on the shunt that is employed. The Low Range mode is for shunts ranging from 1 to 10 mOhm. It will display current to the nearest 0.01 Amps and shows power in watts. The High Range mode is for shunts ranging from 0.1mOhm to 0.999 mOhm. It shows current to the nearest 0.1 Amps and power in kilowatts. Averaging: This allows you to control how often the Volts, Amps, and Watts are refreshed on the LCD screen. A short averaging period allows you to get a better real-time feel for the power fluctuations in the ebike, while longer averaging times produce a stable reading that is easier to record. Select a number between 1 and 7 (default: 5) 1 = 0.025 Sec 2 = 0.05 Sec 3 = 0.1 Sec 4 = 0.2 Sec 5 = 0.4 Sec 6 = 0.8 Sec 7 = 1.6 Sec Set RShunt: The Cycle Analyst is calibrated by programming a resistance value for the current sensing shunt. If you are using a known shunt resistor, then as a first estimate this value can be programmed in mOhm. This will usually get the meter accurate to within 3%. For highest accuracy, the shunt value should be calibrated so that the displayed amperage matches that of a known current reference, which may not be exactly the same as the mOhm rating on the resistor. If the current is reading too low, then the shunt resistance value needs to be decreased, and visa versa. Stand Alone Cycle Analysts, and Direct Plug-in units that are sold at the same time as a controller, are all pre-calibrated to the shunts with which they were sold. Allowable values in High Range mode: 0.728 to 9.999 mOhm Allowable values in Low Range mode: 0.0728 to 0.9999 mOhm If a shunt value is input that falls below this range, then it will be reset to the lowest permitted number. Zero Amps: Over time and temperature changes, it is possible for the zero point to drift, such that even when no current is flowing through the shunt a number like –0.03A is displayed. This can be reset to zero by holding down the button after the ‘zero amps’ screen until the _OK flashes on the bottom right. Note though that many shunt materials, especially the wire shunts used in motor controllers, are prone to generating thermoelectric voltages for a short while after being used. This has the effect of producing what appears to be a lingering current that slowly decays back to zero, and it should not be confused for a current offset in the Cycle Analyst. Volts Sense: Changing this value will change the calibration for the voltage that gets displayed on the screen. The circuit board uses a 20:1 resistive voltage divider ratio, so that each volt that is read by the analog to digital converter is scaled by a factor of approximately 21.0 before being displayed on the screen. This value can be changed either for calibration or to display a voltage that is proportionally higher or lower than the voltage across the shunt. Set # Poles For Direct Plug-in units, this should be set to the number of Hall Effect transitions per full rotation of the wheel. Crystalyte 400 series hubs have 8 while the 5300 series hubs have 12. For units that use a speedometer sensor and spoke magnet, #poles should be set to 1, unless you have multiple magnets on the wheel. ----------------------------- The following 8 items in the advanced setup menu all relate to the how the throttle over-ride behaves for the speed, current, and voltage limiting features. Each limit is implemented as a digital Proportional Integral (PI) controller. More information on these is forthcoming. PS IS PA IA PV IV