Key-Disp KD58C User manual

Contents
Product name and model....................................................................................................... 1
Specifications........................................................................................................................... 1
Appearance and Size.............................................................................................................. 1
Function Summary and Button Definition............................................................................2
◆Function Summary.......................................................................................................... 2
◆Button Definition...............................................................................................................2
Installation................................................................................................................................. 2
Function Area Distribution...................................................................................................... 2
General Operation................................................................................................................... 2
◆Switching the E-bike System On/Off........................................................................... 2
◆Display Interface.............................................................................................................. 2
◆Switching Push-assist 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
◆Unit Mi/KM Conversion...................................................................................................5
◆Wheel Diameter Settings............................................................................................... 5
◆Speed-limit Settings........................................................................................................ 6
◆Battery Power bar Settings............................................................................................6
Personalized Parameter Settings......................................................................................... 6
◆Power assist Level Settings.......................................................................................... 7
Power assist Level option.............................................................................................. 7
PAS Ratio settings.......................................................................................................... 7
◆Controller Over-current Cut Settings...........................................................................8
◆Power assist Sensor Settings ..................................................................................8
◆Speed Sensor Settings................................................................................................8
◆Slow Start up Settings ......................................................................................9
◆Backlight Contrast Settings.........................................................................................9

◆Power-on Password Settings...................................................................................... 10
Power-on Password Enable/Disable......................................................................... 10
Power-on Password Modify.........................................................................................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 PAS ratio default value table..............................................................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
Product appearance and dimensional drawing (unit: mm)

2
Function Summary and Button Definition
◆Function Summary
KD58C has a lot of functions to meet the users’ needs. The indicating contents are as
follows:
●Smart Battery
●Assist-level
●Speed indication (incl. running speed, max speed and average speed)
●Motor-output indicator
●Trip time
●Trip distance and Total distance
●The push-assist 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 represent
functions respectively: ON/OFF,UP and DOWN.
Installation
KD58C can be mounted on the left side of handlebar close to its grip. Adjust the
angle for a good display view. Cut off the power before connecting the corresponding
connectors between display and controller..
Function Area Distribution
Function Area
General Operation
◆Switching the E-bike system On/Off
To switch on the E-bike system, hold the ON/OFF button for 2 s.
Likewise, hold ON/OFF button for 2 s again, the E-bike system will be switched off.
When E-bike system is switched off, the leakage current is less than 1 μA.
■When E-bike is parked for more than 10 minutes, the E-bike system will be
switched off automatically.
◆Display Interface
After the E-bike system is switched on, the display shows current speed by default.
To change the indicating information, press ON/OFF to show in turn: Current Speed
(Km/h) → Trip Distance (Km) →ODO(Km) →Trip Time (Hour) → Average Speed (Km/h)
Battery Indicator
Speed Display
Speed Unit
Assist Level
Power

3
→ Max Speed (Km/h). Each state will display for 2 seconds and then automatically
returns to current speed interface.
Display interface circulation
◆Switching Push-assist Mode On/Off
To access the push-assist mode, hold the DOWN button for 2 s, the E-bike will go
on at a uniform speed of 6 Km/h and “P” is showed on the screen at the same time. The
push-assist function is switched off as soon as you release the DOWN button.
Push-assist Mode
■Push-assist function may only be used when pushing the E-bike. Be aware of
danger of injury when the wheels of the E-bike do not have ground contact.
◆Switching the Lighting On/Off
To switch on headlight of the E-bike, hold the UP button for 2 s the headlight will be
switched on while display backlight darkens.
Likewise, hold the UP button for 2 s again, the bike headlight will be switched off
while display backlight is gaining brightness.
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 assist level as per your needs.

4
assist Level “4”
◆Power Indicator
The output power of the motor can be indicated by below interface.
Motor Power Interface
◆Error code Indication
If an error occurs in the electronic control system, the error code will appear
automatically. See error code definitions in Attached list 1.
Error Code Indication
■Show the display to a Service Center when an error code appears. Or else you
will not be able to ride the bike normally.
General Settings
After the E-bike system is switched on, to access general settings menu, hold both the
UP and DOWN button simultaneously for 2 s.
Press the Up or DOWN button to choose setting items, press ON/OFF to confirm
the corresponding settings.

5
General settings interface
◆Trip Distance Clearance
Clear Trip means 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 ON/OFF button to confirm the option, the display will show 'OK' and return
to the general settings interface. Otherwise the display will return to the general settings
interface directly.
Trip distance clearance
◆Unit Mile/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 ON/OFF button to access trip distance
clearance settings and the display will show 'OK' then returns to general settings interface.
The default value is Metric.
Mile and Kilometer Conversion Settings 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 display will show
'OK' then returns to general settings interface.

6
Wheel Diameter Settings Interface
◆Speed-limit Settings
Set LS represents limited speed settings. When the running speed is faster than
limited speed, 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, hold ON/OFF for 2 s and the display will show 'OK'
then returns to general selection settings interface.
Limit Speed Settings Interface
◆Battery Power bar Settings
VOL represents 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 ON/OFF button.
Likewise,after 5 bars voltage values are entered, hold ON/OFF for 2 s to confirm
and return to the previous menu.
Battery Power Bar Settings
Personalized Parameter Settings(Specific Set)
Personalized Parameter Settings(Specific Set) can match various requirements in
use.
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 personalized parameter settings
items, then press the ON/OFF button to enter the corresponding settings interface.

7
Personalized parameter settings Interface
◆Power assist Level Settings
Power Set means power 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 assist level mode is displayed.
To store the changed setting and access the PAS ratio settings page, press the
ON/OFF button.
PAS mode option interface
PAS Ratio settings
To modify the value of PAS ratio can meet bikers’ different requirements.
For example, the range is “45-55 percent” for PAS level 1, ratio value can be
modified and the default is 50 percent.
Press the UP or DOWN button to increase or decrease the number. Press the
ON/OFF button to confirm and move to the next PAS level ratio settings. Level 9 is the
maximum. After all PAS ratios are input, hold the *DOWN button to confirm and return to
personalized parameter settings(Specific Set) items interface. For various symbol
definitions, please refer to Attached list 2.

8
PAS Ratio Interface
◆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, hold the “ON/OFF” button and then return to previous
menu.
Current Settings Interface
◆Power assist Sensor Settings
Assistant num represents PAS sensitivity settings. The sensitivity value is “5” to
“24”.
To store a changed setting, press the “ON/OFF” button and then return to previous
menu.
To change PAS sensitivity settings, press the “+” or the “-” button to choose the
desired sensitivity value.
The PAS Sensitivity Settings

9
◆Speed Sensor Settings
Speed Sensor represents speed sensor settings. The default value is 1
To change speed sensor settings, press the “+” or the “-” button to choose the
quantity of magnet heads (the range is from 1 to 15).
To store a changed setting, hold the “ON/OFF” button and then return to previous
menu.
Speed Sensor Selection
◆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 display will show 'OK' and return to
previous menu interface. 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 modify the backlight brightness, press the “+” button or the “-” button to choose
the desired brightness.
To store a changed setting, press the “ON/OFF” button and return to previous menu
interface.
Backlight Brightness Settings Interface

10
◆Power-on Password Settings
P2:0000 represents power-on password settings. The default password is 1212.
After accessing the power-on password settings, press UP/DOWN to modify the
value and press ON/OFF to confirm digit 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.
Power-on Password Entry 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 Enable. If you choose Enable, press the ON/OFF
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 Change
When the display shows “Password Set, P3”, press the UP or DOWN button to modify
the value and then press the ON/OFF button to confirm digit one by one until the new 4-
digit password is completed.
To store the 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
◆Exit settings
In the settings state, press the ON/OFF button to confirm the input. Hold the
ON/OFF 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.

11
■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 usage and 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 is out of 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 wires in the harness.
Warnings:
1. Use the display with caution. Don’t attempt to release or link the connector when
battery is on power.
2. Try to avoid hitting the display.
3. Don’t modify system parameters to avoid parameter disorder.
4. Make the display repaired when an error code appears.
▉THIS MANUAL INSTRUCTION IS A GENERAL-PURPOSE VERSION.SOME OF
THE VERSIONS FOR THE DISPLAY SOFTWARE WILL BE DIFFERENT FROM
SPECIFICATION TO SPECIFICATION. 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：PAS ratio default value table
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%