Key-Disp KD58C User manual

Contents
Product name and model............................................................................................................... 1
Specifications....................................................................................................................................1
Appearance and Size...................................................................................................................... 1
Function and Button Definition...................................................................................................... 2
◆Function Summary.................................................................................................................. 2
◆Function Layout.........................................................................................................2
◆Button Definition.......................................................................................................................2
Install Instructions.............................................................................................................................2
General Operation........................................................................................................................... 2
◆Switching the E-bike System On/Off................................................................................... 2
◆Display Interface......................................................................................................................2
◆Switching Push-assistance mode On/Off...........................................................................3
◆Switching the Lighting On/Off............................................................................................... 3
◆Assist Level Selection............................................................................................................ 3
◆Power Indicator........................................................................................................................ 4
◆Error code Indication................................................................................................................ 4
General Settings.............................................................................................................................. 4
◆Trip Distance Clearance........................................................................................................ 5
◆Toggle the unit km/mile........................................................................................................... 5
◆Wheel Diameter Settings....................................................................................................... 5
◆Speed limit Settings................................................................................................................ 6
◆Battery Power bar Settings....................................................................................................6
Personalized Parameter Settings................................................................................................. 6
◆Assist Level Settings...............................................................................................................7
Assist Level mode options.....................................................................................................7
Assist Level ratio settings...................................................................................................... 7
◆Controller Over-current Cut Settings...........................................................................8
◆Power Assist Sensor settings .....................................................................................8
◆Speed Sensor Settings................................................................................................8
◆Slow Start up Settings ............................................................................................9
◆Backlight Brightness Settings......................................................................................9
◆Power-on Password Settings............................................................................................. 10

Power-on Password Enable/Disable................................................................................ 10
Power-on Password Change..............................................................................................10
◆Exit settings............................................................................................................................ 10
Recover default settings...............................................................................................................11
Quality assurance and warranty scope..................................................................................... 11
Connection layout.......................................................................................................................... 12
Warnings..........................................................................................................................................12
Attached list 1 Error code definition............................................................................................ 13
Attached list 2 Assist level ratio defaults...........................................................................13

1
Product name and Model
Electric Bicycle Intelligent Display,
Model: KD58C.
Specifications
●24V/36V /48V Power Supply
●Rated current: 10mA
●The maximum working current: 30mA
●Off-state leakage current: <1μA
●Working temperature: -20 ~ 60 ℃
●Storage temperature: -30 ~ 70 ℃
Appearance and Size
Display appearance and dimensional drawing (unit: mm)

2
Function and Button Definition
◆Function Summary
KD58C has a lot of functions to meet the riders’ needs. The indication elements are
as follows:
●Battery SOC
●Assist level
●Speed indication (incl. Current speed, Max. speed and Avg. speed)
●Motor-output indicator
●Trip time
●Trip distance and Total distance
●The push-assistance function
●Switch the Lighting On/Off
●Error Code indication
●Various Parameters Settings (e.g., wheel size, speed-limited, battery level bar,
PAS level, password enable, controller limited current etc. )
●Recover Default Settings
◆Function Layout
Function Layout
◆Button Definition
There are three buttons ( , , ) on KD58C display. In this manual, we use
words ON/OFF, UP, DOWN to represent these 3 symbols ( , , ) .
Install Instructions
KD58C can be mounted on the left side of handlebar close to its grip. Adjust the
angle for a good screen view. Cut off the power before connecting the corresponding
connectors between display and controller.
General Operation
◆Switching the E-bike system On/Off
To switch on the E-bike system, hold the ON/OFF button for 2s.
To switch off the E-bike system, hold the ON/OFF button for 2s.
When E-bike system is switched off, the leakage current is less than 1 μA.
■When E-bike is parked for approx. 10 minutes, the E-bike system switches off
automatically.
◆Display Interface
After the E-bike system is switched on, the display shows current speed by default.
Press ON/OFF button to switch between indication functions below:
Current Speed (Km/h) → Trip Distance (Km) →ODO(Km) →Trip Time (Hour) →
Average Speed (Km/h) → Max Speed (Km/h). Each state will display for 2 seconds and
it automatically cycles back to current speed interface again.
Battery Indicator
Speed Display
Speed Unit
Assist Level
Power

3
Display indication cycle interface
◆Switching Push-assistance Mode On/Off
To activate the push-assistance function, press and hold the DOWN button. After 2
seconds, the E-bike will go on at a uniform speed of 6 Km/h and “P” is shown on the
screen at the same time. The push-assistance function is switched off as soon as you
release the DOWN button.
Push-assistance Mode
■Push-assistance function may only be used when pushing the E-bike. Be
aware of danger of injury when the wheels of E-bike do not have ground contact
while using push-assistance function.
◆Switching the Lighting On/Off
To switch on E-bike lights, hold the UP button for 2s. The E-bike lights will be
switched on while display backlight darkens.
Likewise, hold the UP button for 2s again, the E-bike front light will be switched off
while display backlight recovers the brightness.
■If E-bike lights are independent of “UP” button, the “UP” button can only be used to
switch on/off the display backlight.
Switch the Lighting on/off
◆assist Level options
Assist levels indicate the output power of the motor. The default value is level “1”.
The default power ranges from level “0” to level “5”.The output power is zero on
Level “0”. Level “1” is the minimum power. Level “5” is the maximum power.
Press UP/DOW to change the assist level.

4
Assist Level “4”
◆Power Indicator
The output power of the motor can be indicated by below interface.
Motor Power Interface
◆Error code Indication
The components of the E-bike system are continuously and automatically monitored.
When an error is detected, the respective error code is indicated in text indication area.
Refer to the detailed definition of the error codes in Attached list 1.
Error Code Indication
■Have the display inspected and repaired when an error code appears. Or else,
you will not be able to ride the bike normally. Please always refer to an authorized
bicycle dealer.
General Settings
After the E-bike system is switched on,
To access General Settings menu, hold both the UP and DOWN button
simultaneously for 2s.
Press the Up or DOWN button to choose setting items and press ON/OFF to enter
the setting interface.

5
General Settings interface
◆Trip Distance Clearance
Clear Trip means trip distance clearance. Press the UP or DOWN button to choose
YES or NO. The default value is NO.
To clear a trip, choose YES and press the ON/OFF button to confirm. The screen
says 'OK' and returns to the General Settings interface.
Trip distance clearance
◆Unit Mile/KM toggling
Set Unit represents unit settings. The default value is Metric ‘KM’
To toggle unit, press UP/DOWN until the desired unit is displayed.
To store a changed setting, press the ON/OFF button to confirm. The screen says
'OK' and then returns to General Settings interface.
Mile and Kilometer Toggling Interface
◆Wheel Diameter Settings
Set WD represents wheel diameter settings. Optional values are 16, 18, 20, 22, 24,
26, 700C and 28. The default value is 26 inch.
To change basic settings, press UP/DOWN to increase or decrease until the
desired value is displayed.
To store a changed setting, press the ON/OFF button and the screen says 'OK'
and then returns to General Settings interface.
Wheel Diameter Settings Interface

6
◆Speed limit Settings
Set LS represents speed limit settings. When current speed is faster than speed
limit, the E-bike system will be switched off automatically. Limited speed range is
12Km/h to 40Km/h. The default value is 25Km/h.
To change basic settings, press UP/DOWN to increase or decrease until the
desired value is displayed.
To store a changed setting, press ON/OFF button and the screen says 'OK' then
returns to General settings interface.
Speed Limit Settings Interface
◆Battery Power bar Settings
Set Voltage represents voltage settings. Each bar represents a voltage value. 5 bar-
voltage values must be entered one by one.
For example, Vol-1 is the first bar voltage and the default value is 31.5V. Press
UP/DOWN to increase or decrease the voltage value.
To store a changed setting, press the ON/OFF button and access the second bar
setting.
After 5 bar-voltage values are entered, press ON/OFF button to confirm. The
screen says 'OK' and then returns to General settings interface.
Battery Power Bar Settings
Personalized Parameter Settings(Specific Set)
Personalized Parameter Settings(Specific Set) can meet various riders’
requirements.
Hold both UP and DOWN button for 2s to enter General Settings and hold the UP
and DOWN button for 2s again to enter Personalized Parameter Settings selection
interface. Press the UP or DOWN button to choose the settings items, then press the
ON/OFF button to enter the corresponding settings interface.

7
Personalized parameter settings Interface
◆Assist Level Settings
Power Set means assist level settings
Power assist Level mode
In assist level settings, there are 8 modes for your choice: 0-3, 1-3, 0-5, 1-5, 0-7, 1-7,
0-9, 1-9. The default value is 0-5.
To select the mode of assist level, press UP/DOWN to increase or decrease until the
desired mode is displayed.
To store a changed setting, press the ON/OFF button and access assist level ratio
settings page.
Assist level mode option interface
Assist Level Ratio settings
The speed of each assist level can be adjusted to meet different riders’ needs by
setting the ratios
For example, the default ratio is 50% for level “1”; the ratio range is “45-55 percent”
for level “1”.
To change the ratio of a certain assist level, press the "UP" button or "DOWN" button
to choose the desired value, and press the "i" button to confirm and then move to the
next level ratio settings.
After ratios of all levels are set, hold the “DOWN” button for 2s to confirm and return
to previous menu. For ratio default values, please refer to Attached list 2.
Assist Level Ratio Settings

8
◆Controller Over-current Cut Settings
Current Set represents controller over-current cut settings. The current value can be
changed from 7.0A to 25.0A.
To change basic settings, press the “+” or the “-” button to increase or decrease the
value of the current.
To store a changed setting, press the “ON/OFF” button. The screen says “OK” and
returns to previous menu.
Current Settings Interface
◆Power assist Sensor Settings
‘Assistant num’ represents the numbers of magnets on PAS disk. The default
number is 12. The adjustable range is 5 to 24.
To change the number of magnets on PAS disk, press “UP” or “DOWN” button to
choose the desired quantity.
To store a changed setting, press the “ON/OFF” button. The screen says “OK” and
returns to previous menu.
The PAS Magnet Quantity Settings
◆Speed Sensor Settings
S‘Speed Sensor’ represents speed sensor settings. The default value is 1.
To change speed sensor settings, press the “UP” or the “DOWN” button to select the
quantity of magnets on the bike spokes (the range is from 1 to 15).
To store a changed setting, press the “ON/OFF” button. The screen says “OK” and
returns to previous menu.

9
Speed Sensor Settings
◆Slow Start up Settings
Slow Start represents slow start up. The range is 1-4 seconds. 4 is the slowest.
To change slow start up settings, press the UP or DOWN button to change the value
and press the ON/OFF button to confirm. The screen says 'OK' and return to previous
menu. The default value is 1.
Slow Start up settings interface
◆Backlight Brightness Settings
Backlight Set represents backlight brightness settings. Level “1” is the low
brightness, Level “3” is high brightness. The default level is “2”.
To change the backlight brightness, press the “+” button or the “-” button to choose
the desired brightness.
To store a changed setting, press the “ON/OFF” button. The screen says “OK” and
returns to previous menu interface.
Backlight Brightness Settings Interface

10
◆Power-on Password Settings
Password Set represents power-on password settings. The default password is
1212. When the screen shows P2:0000, you need to input the current password or the
default password”1212”.
Press UP/DOWN to change the numbers and press ON/OFF to confirm digits one by
one until the correct 4-digit password is completed. Then press ON/OFF to access
power-on password enable settings interface; otherwise stay still in the password input
state.
Password Input Interface
Power-on Password Enable/Disable
Press the UP or DOWN button to choose Disable or Enable and press the ON/OFF
button to confirm. The default value is Disable. If you choose Enable, press the ON/OFF
button to enter Power-on Password Change interface; otherwise you will exit the power-
on password settings.
Power-on Password Disable/Enable Interface
Power-on Password Change
When the display shows “Password Set, P3:0000”, press the UP or DOWN button to
change the numbers and then press the ON/OFF button to confirm digits one by one until
a new 4-digit password is completed.
To store a new power-on password, hold the ON/OFF button for 2 seconds and
then exit settings.
When you switch on the E-bike system next time, the display will show P1,0000,
please input the new password to power on.
Power-on Password Change Interface

11
◆Exit settings
In the settings state,
Press the ON/OFF button to confirm the input.
Hold the ON/OFF button for 2s to save the settings and then exit the current settings.
Hold the DOWN button for 2s to cancel the operating but not to store the settings,
and then return to previous menu.
■If there is not any operations in one minute, display will exit the settings state
automatically.
Recover default settings
dEF means recover default settings. Press both the UP and ON/OFF button for 2 s to
enter recover default settings.Press the UP or DOWN button to choose Y or N. Y means
that recovers default settings. N means that do not recover default settings. When it is Y,
hold the ON/OFF button for 2 s to recover default settings, the display shows ‘dEF-00’ at
the same time,and then return to general display state. The default value is N.
Recover Default Settings Interface
Quality assurance and warranty scope:
I. Warranty:
1) The warranty will be valid only for products used in normal conditions.
2) The warranty is valid for 24 months after the shipment or delivery to the customer.
II. The following cases do not belong to warranty scope:
1) The display is demolished.
2) The damage of the display is caused by wrong installation or operation.
3) The shell of the display is broken after the display leaves the factory.
4) The cable of the display is broken.
5) Beyond warranty period.
6) The fault or damage of the display is caused by the force majeure (e.g., fire,
earthquake, etc.).

12
Wire connection layout
Connector wire sequence
Connector to controller display end connection wire end to display
Wire sequence table
Wire sequence
Color
Function
1
Red(VCC)
+
2
Blue(K)
Lock
3
Black(GND)
-
4
Green(RX)
RX
5
Yellow(TX)
TX
■Some products have wire connection with water-proof connectors, users can
not see the color of lead wires in the harness.
Warnings:
1. Use the display with caution. Don’t attempt to release or link the connector when
battery is power on.
2. Try to avoid hitting the display.
3. Don’t modify display background parameters to avoid parameter disorder. Or else,
you will not be able to ride the bike normally.
4. Have the display repaired when it does not work properly.
▉This manual instruction is a universal version for DISPLAY KD58C. Some versions
of this display may be different from specification to specification as to the software.
Please always refer to an actual version.

13
Attached list 1: Error code definition
Error Code
Definition
21
Current Abnormality
22
Throttle Abnormality
23
Motor Phase Abnormality
24
Motor Hall Signal Abnormality
25
Brake Abnormality
30
Communication Abnormality
Attached list 2：Assist level ratio defaults
Level
PAS
level mode
1
2
3
4
5
6
7
8
9
0-3/1-3
50%
74%
92%
—
—
—
—
—
—
0-5/ 1-5
50%
61%
73%
85%
96%
—
—
—
—
0-7/ 1-7
40%
50%
60%
70%
80%
90%
96%
—
—
0-9/ 1-9
25%
34%
43%
52%
61%
70%
79%
88%
96%