Juicybike KD21C User manual

Juicy Bike LCD Display
User Manual
Contents sections:
1. Description (Page 2)
2. Daily User Guide – User Level (Page 4)
3. Configuration Settings (wheel size specific) – Installer Level (Page 8)
4. System Settings (control system specific) – Advanced Level (Page 9)
Diagnostic and reference guide lists

1. Description
Product name and model
Juicy Bike LCD electric bike display (model: KD21C)
Specifications
•24V/36V/48V Power Supply
•Rated current 10mA
•Maximum working current 30mA
•Off leakage current <1uA
•Operating temperature :-20℃~ 60℃
•Storage temperature: -30℃~ 70℃
Appearance and Size
Materials and Colour
•KD21C product’s shell and fixing bracket are made of ABS and Nylon. The LCD window
lens is made from hard acrylic. These materials are suitable for working in temperatures
ranging between -20 and +60 oC.
Display appearance and dimensions: (unit: mm)

3
Summary of functions and Buttons
This display provides a host of useful functions and displays for Juicy Bikers:
●Battery charge level
●Power assist level
●Speed Display in MPH or KM/H
●Trip distance and cumulative distance
●6km/h walk assistance / start assistance
●Front light switch
The advanced sections of this manual will explain how to first set-up and then tweak settings
should the need arise, explaining:
●Error Codes
●Parameter Settings (for wheel size, speed-limiting, battery level tweaking, PAS relative
level adjustments, controller current limits, adjustment for maximum speed, and even a
password security feature.)
And if you ever get into a pickle this manual will show how to recover the default settings.
You shouldn’t have to change any settings to fully enjoy riding your bike, and please be aware it
is possible to spoil your fun completely by experimenting needlessly!

4
2. Using the display
The screen is best explained by a diagram…
Just 3 buttons
We use just 3 buttons to both use and adjust the display. These are:
MODE, UP and DOWN
Before and during your rides
Power On/Off
Hold down the MODE button and the display will switch on and light up (if you’ve
remembered to switch on your battery first…). Hold down the MODE button again and the
display switches off. The display will also switch itself off if there’s been no activity for 10
minutes.
Mileage Display
When first switched on the display will show the cumulative distance travelled. Press MODE to
shift the display from total trip distance to trip distance.
Cumulative Distance Interface Total Distance Interface

5
Walk assist mode
Press and hold the DOWN button for 2 seconds and your e-bike motor will start to run at a
uniform speed of 6 Km/h and will continue to do so whilst you press that button. The display will
show “P” on the screen whilst in this “Walk Assist” mode. When you release the DOWN button
walk assist mode ends and the display reverts to as it was.
Walk Assist Mode
You should not be astride the bike when using walk assist.
Front Light
Press UP for 2 seconds to turn on the front light of your bike and also the backlight of the
display. Hold UP again for 2 seconds and the light is turned off.
Turn On/Off Backlight
Power Assistance (PAS) Level Selection
Use the UP or DOWN buttons to change the assistance provided by your motor.
The default power ranges from level 1 to level 5. If you want to switch off assistance then use
DOWN to reach level 0
PAS Level 3

6
Battery Indicator
The battery bar shows the remaining capacity of the battery.
When all the battery charge has been used its indicator will start to flash – you should
definitely charge the battery when this happens.
Low Voltage Flash
Battery Indicator
Error Code Information
The display can help enormously should there ever be a problem with any of the electrical
components in the system. An error code will be displayed and a list of what these codes
represent can be found later in this manual.
Error Code Indicator
3. Changing the settings
The display should arrive pre-configured and working properly for your bike. If you do need to
change the way the display controls your bike then please do so sparingly, making a record of
what you do and please bear in mind that some settings can make your bike no longer fully legal
to ride in some countries. You may wish to change some settings to comply with local laws when
travelling abroad.
General User Settings
•Any changes you make should be set whilst the bike is at rest.
Access the Settings
Hold MODE button to start the display, and then hold both UP and DOWN for 2 seconds to enter
the General User Settings Menu.Then navigate through the following first level settings by
tapping the MODE button.

7
Trip Distance Clearance
tC indicates single trip distance clearance settings.
Press UP or DOWN to choose Y or N to clear the current trip distance.
Then press MODE to confirm and exit.
Trip Distance Clearance Settings Interface
Backlight Contrast settings
bL indicates the contrast setting for the backlight.
Level 1 gives low brightness and Level 3 is high brightness.
Press UP or DOWN to modify the backlight brightness.
Press MODE to confirm and exit.
Backlight brightness Settings Interface
Imperial and Metric units
Uindicates current unit settings. 1is imperial (Miles) and 2metric (KM).
Press UP or DOWN to change and press MODE to confirm and exit.
Inch and Metric Conversion Settings Interface

8
General Parameter Settings
Hold both UP and DOWN for 2 seconds enters User Settings, then hold both MODE and DOWN
to access the following General Parameter Settings.
Wheel Diameter Settings
Ld indicates the settings for wheel diameter.
Selectable values include 16,18,20,22,24,26,700C and 28.
Press UP or DOWN to select the correct value to match the wheel diameter. The default
diameter is 20 inch. Press and hold MODE to save and exit.
Wheel Diameter Settings Interface
Speed-limit Settings
LS shows the setting for the maximum assisted speed of the bike.
When the bike speed is faster than the limit speed, the display will ask the controller to gradually
cut the motor power.
Limit speed range is 12Km/h to 40Km/h. Limit speed default value is 25Km/h.
Press UP or DOWN to select the desired value, and then hold MODE to save and exit.
PLEASE NOTE: Juicy Bikes have separate controllers which also limit the assisted speed to the
legal requirements for the UK and Europe, so setting a faster speed will not enable the bike to be
powered any faster. In fact, to avoid conflict with the controller we recommend the LS setting is
set to maximum.
Limit Speed Settings Interface

9
4(Very) Advanced Settings!
There are 8 settings in the Advanced Settings interface. None of these should need changing
when the unit arrives and should only be altered by someone who fully understands their
purpose. They are:
Battery Power Bar (VOL), Power Assistance Levels and Ratio (PAS), Over- Current Protection
(CUR), Power Assistance Sensor Direction (RUN), Speed Sensor Sensitivity (SCN) and Magnet
Number (N) and Sensor Number (SPS), Throttle Function (HL), System (DLY) and Power-on
Password Settings (P2).
To access these advanced settings hold both UP and DOWN for more than 2 seconds to enter
general settings, and then hold both UP and DOWN again to enter the Advanced Setting items
selection page.
Press UP or DOWN to choose a setting, and then press MODE to enter its individual value page.
Option Select Interface
Battery Power Bar Settings
You should never need to change these settings.
VOL indicates the voltage setting for each of the five battery level displays.
Each bar represents a voltage value. 5 voltage values must be entered one by one.
VOL 1is the first bar voltage value, normally set to 31.5 volts. Press UP or DOWN to increase or
reduce the value represented by the first bar. Press MODE to confirm and enter the second bar
value. After all 5 voltage values have been entered, hold MODE to confirm and return to previous
menu.
Battery Power Bar Settings

10
Power Assistance Level Settings
1. Power Assistance: Number of Levels
You can select how many levels of assistance are provided by the display.
You can choose to have 3, 5, 7or 9levels
Each range of levels may also include zero: 0-3 / 1-3, or 0-5 /1-5, or 0-7 /1-7, or 0-9 /1-9.
The default mode is 0-5 i.e. 5 increasing levels of assistance ( and 0 for zero assistance).
Press UP or DOWN to select your preference, then press MODE to confirm and enter the PAS
ratio settings page. 5 levels normally works well, but choosing a higher number can give a better
match for your own preferred rate of exercise while riding.
PAS Mode Select Interface
2. PAS Ratio settings
Each level of PAS can be set as a percentage value.
We recommend using 5 levels of assistance with the values 50, 61, 73, 85 and 96.
Use UP and DOWN to enter a value then Press MODE to confirm each value in turn.
After all the PAS ratios have been entered, hold MODE to confirm all values and return to the
previous menu. (Other settings can be found in the attached list no. 3)
PAS Ratio Interface
Over-Current Protection Settings
CUR indicates the setting for protecting your bike from damage caused by over stressing
its electrical components. The CUR value can be changed from 7.0A to 22.0A. But if you exceed
15A you are likely to damage your bike and you will also invalidate its warranty.
This value should remain set at no higher than15A.
CUR Settings Interface