Key-Disp KD58C User manual

Contents
Product name and model .............................................................................................. 1
Specifications................................................................................................................. 1
Appearanceand Size..................................................................................................... 1
Function Summary and Button Definition..................................................................... 2
◆Function Summary................................................................................................. 2
◆Button Definition..................................................................................................... 2
Assembly........................................................................................................................ 2
Function Area Distribution............................................................................................. 2
General Operation......................................................................................................... 2
◆Switching the eBike On/Off ................................................................................... 2
◆Display Interface.................................................................................................... 2
◆Switching Push-assistance mode On/Off ............................................................. 3
◆Switching the Lighting On/Off................................................................................ 3
◆Assistance Level Selection.................................................................................... 3
◆Power Indicator ...................................................................................................... 4
◆Errorcode Indication............................................................................................... 4
General Settings............................................................................................................ 4
◆Trip Distance Clearance........................................................................................ 5
◆Unit Mi/KM Conversion.......................................................................................... 5
◆Wheel Diameter Settings....................................................................................... 5
◆Speed-limit Settings............................................................................................... 5
◆Battery Power bar Settings.................................................................................... 6
Personalized Parameter Settings ................................................................................. 6
◆Power Assistant Level Settings............................................................................. 6
Power Assistant Level option ................................................................................ 6
PAS Ratio settings ................................................................................................. 7
◆Slowly Start up Settings......................................................................................... 7
◆Power-on Password Settings ................................................................................ 7
Power-on Password Enable/Disable..................................................................... 8
Power-on Password Modify................................................................................... 8
◆Exit settings............................................................................................................ 8
Recover defaultsettings................................................................................................ 8

Quality assurance and warranty scope......................................................................... 9
Connection layout.......................................................................................................... 9
OperationCautions...................................................................................................... 10

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 leakage current: <1uA
●The supply controller working current: 50mA
●Working temperature: -20 ~ 60 ℃
●Storage temperature: -30 ~ 70 ℃
Appearance and Size
Display appearance and dimension figure (unit: mm)

2
Function Summary and Button Definition
◆Function Summary
KD58C can provide a lot of functions to fit the users’ needs. The indicating contents
are as following:
●Smart Battery indicator
●Assistance-level indication
●Speed indication (incl. running speed, maxspeed and average speed)
●Motor-output indicator
●Trip time indication
●Trip distance and Total distance
●The push-assistance function
●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
◆Button Definition
There are three buttons ( , , ) on the KD58C display that represented by
the following functions respectively: MODE, UP and DOWN.
Assembly
The KD58C display should be mounted on the handlebar between the left grip and
the left brake clamp of the eBike at a comfortable angle. Cut off the power before connect
the display to the controller.
Function Area Distribution
Monitor Area
General Operation
◆Switching the eBike On/Off
To switch on the eBike system, hold the MODE button for 2 s.
In the same way to hold the MODE button for 2 s again, the eBike system will be
switched off.
When switching off the eBike system the leakage current is less than 1 uA.
■When parking eBike for more than 10 minutes, the eBike system switches off
automatically.
◆Display Interface
After switching on the eBike system, the display shows Running Speed. On the
condition of riding, to change the indicated information, press MODE to show in turn as
below: Running Speed (Km/h) →Trip Distance (Km) →Trip Time (Hour) →Average
Battery Indicator
Speed Display
Speed Unit
Assistance Level
Power

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Speed (Km/h) →Max Speed (Km/h). Each state will display for 2 seconds and then
automatically returns to the Running Speed interface. On the condition that the speed is
0 km/h, Total Distance will be added to the circulation interface.
The circulation interface of the condition that the speed is 0 km/h
◆Switching Push-assistance mode On/Off
To access the push-assistance mode, hold the DOWN button for 2 s, the eBike will
go on at a uniform speed of 6 Km/h, “P” is showed on the screen at the same time. The
push-assistance function switches off as soon as you release the DOWN button.
Push-assistance Mode
■Push-assistance function may only be used when pushing the eBike. Danger of
injury when the wheels of the eBike do not have ground contact while use the
push-assistance function.
◆Switching the Lighting On/Off
To switch on headlight of the eBike, hold the UP button for 2 s.
In the same way to hold the UP button for 2 s again, the headlight will be switched
off.
Switch On/Off the Lighting
◆Assistance Level Selection
Assistance 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.

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Assistance Level “4”
◆Power Indicator
The out power of the motor can be indicated by the display.
Motor Power Indicator Interface
◆Error code Indication
If there are errors about the electronic control system, the error code will appear
automatically. Here is the message ofthe error code in Attached list 1.
Error Code Indication
■Offer the display to a Service Center when an error code appears.
General Settings
After the eBike system is switched on, to access general settings menu, hold both the
UP and DOWN button for 2 s.
Press the Up or DOWN button to select the content, press MODE to confirm the
corresponding settings.
General selection settings interface

5
◆Trip Distance Clearance
Clear Trip means single trip distance clearance. Press the UP or DOWN button to
choose YES or NO to clear the trip distance. The default value is NO. If you choose YES
and press the MODE button to confirm the option, the display will show OK and return
to the general selection settings interface. Otherwise the display will return to the general
selection settings interface directly.
Trip distance clearance
◆Unit Mi/KM Conversion
Set Unit represents unit settings.
To convert unit, press UP/DOWN to increase or decrease until the desired setting is
displayed.
To store a changed setting, press the MODE button to access trip distance clearance
settings and the display will showOK then returns to general selection settings interface.
The default value is Metric.
Mile and Kilometer Conversion Settings Interface
◆Wheel Diameter Settings
Set WD represents wheel diameter settings. Electable 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 MODE button and the display will show
OK then returns to general selection settings interface.
Wheel Diameter Settings Interface
◆Speed-limit Settings
Set LS represents limit speed settings. When the running speed is faster than
limit speed, the eBike system will switch off automatically. Limit 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

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desired value is displayed.
To store a changed setting, hold MODE for 2 s and the display will display OK
then returns to general selection settings interface.
Limit Speed Settings Interface
◆Battery Power bar Settings
VOLrepresents voltage settings. Each bar represents a voltage value. 5 bars voltage
values must be entered one by one. For example, VOL 1 is the first bar voltage value,the
default value is 31.5V.
To set battery power bar, press UP/DOWN to increase or decrease the number.
To store a changed setting and access the second bar,press the MODE button.
By analogy, after 5 bars voltage values is entered, hold MODE for 2 s to confirm and
return to the previous menu.
BatteryPower Bar Settings
Personalized Parameter Settings
Personalized Parameter Settings can match various requirements in use. T
Hold the UP and DOWN button for 2 s to enter general settings, then use the same
manner to enter personalized parameter settings selection interface. Press the UP or
DOWN button to choose the personalized parameter settings items, then press the
MODEbutton to enter the corresponding settings interface.
Personalized parameter settings Interface
◆Power Assistant Level Settings
Power Assistant Level option
In assistance level settings, there are 8 modes to select: 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 assistance level,press UP/DOWN to increase or decrease until
the desired setting is displayed.
To store the changed setting and access the PAS ratio settings page, press the
MODE button.

7
PAS Mode option Interface
PAS Ratio settings
To modify the value of PAS ratio can match the different requirements.
For example, the range is “45-55 percent”of 1 level, bottom value can be modified
and the default is 50 percent.
Press the UP or DOWN button to increase or decrease the number. Press the MODE
button to confirm and turn to the next PAS ratio settings. 9 levels is the maximum. After
all PAS ratio inputted, press the MODE button to confirm and return to general selection
settings interface. Various symbol definitions please refer to Attached list 2.
PAS Ratio Interface
◆Slowly Start up Settings
Slow Start represents slowly start up. The range is 1-4, 4 is the slowest.
To change slowly start up settings, press the UP or DOWN button to select, press the
MODE button to confirm and the meter will display OK then return to general selection
settings interface. The default value is 1.
Interface of slowly settings up
◆Power-on Password Settings
P2:0000 represents power-on password settings. The default value is1212.
To access the power-on password settings, press UP/DOWN to modify the value
and then press MODE to confirm digit one by one until the correct 4-digit password is
completed, and then press MODE to access power-on password enable settings
interface, otherwise stay on the password input state.

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Power-on Password Entering Interface
Power-on Password Enable/Disable
Press the MODE button to enter power-on password modify interface. Press the UP
or DOWN button to select Disable or Enable and press the MODE button to confirm. The
default value is Enable. If you choose Enable, press the MODE button to enter Power-on
Password Modify interface, otherwise exit the power-on password settings interface.
Power-on Password Disable/Enable Interface
Power-on Password Modify
When the display shows “Password Set, P3”,press the UP or DOWN button to modify
the value and then press the MODE button to confirm digit one by one until the new 4-digit
password is completed.
To store the new power-on password, hold the MODE button for 2 s and then exit
settings.
When switching the eBike system on next time, the display will show P1,0000,
please input the new password to power on.
Power-on Password ModifyInterface
◆Exit settings
In the settings state, press the MODE button to confirm the input. Hold the MODE
button for 2 s to save the settings and then exit the current settings. Hold the DOWN
button for 2 s to cancel the operating but not saving the settings data, and then return to
previous menu.
■If there is not any operations in one minute, display will exit the settings state
automatically.
Recover defaultsettings
dEF means recover default settings. Press both the UP and MODE 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,

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hold the MODE 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
ⅠWarranty
1) The warranty will be valid only for products used in normal usage and conditions.
2) The warranty is valid for 24 months after the shipment or delivery to the customer.
ⅡOthers
The following items do not belong to our warranty scope.
1) The display is demolished.
2) The damage of the display is caused by wrong installation or operation.
3) Shell of the display is broken when the display is out of the factory.
4) Wire 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.).
Connection layout
Connector line sequence
Display-side Connector Display-side adapter Switch wiring

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Line sequence table
Linesequence
Color
Function
1
Red（VCC）
+
2
Blue(K)
Lock
3
Black(GND)
-
4
Green(RX)
RX
5
Yellow(TX)
TX
■Some wire use the water-proof connector, users are not able to see the inside
color.
Operation Cautions
Be care of the safety use. Don’t attempt to release the connector when battery is on
power.
◆Try to avoid hitting.
◆Do not modify system parameters to avoid parameters disorder.
◆Make the display repaired when error code appears.
Attached list 1: Error code definition
Error Code
Definition
21
Current Abnormality
22
Throttle Abnormality
23
Motor Abnormality
24
Motor HallAbnormality
25
Brake Abnormality
30
Communication Abnormality
Attached list 2：Power assist table
Level
Level
Item
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%