Key-Disp KD218 User manual

Product model
E-bike Intelligent LCD display
Model: KD218
Specifications
●24V/36V/48V Power Supply
●Rated working current :10mA
●The maximum working current: 30mA
●Off-state leakage current: <1μA
●Operating temperature: -20℃~ 60℃
●Storage temperature: -30℃~ 70℃
Appearance and Size
Product appearance and dimensional drawing (unit: mm)

Functional Area Distribution:
Function Summary
KD218 has many functions to meet the Users’ needs. The indicating contents are
as follows:
●Battery and battery percentage
●Motor Power
●assist-level
●Speed indication (incl. current speed, Max. speed and Ave. speed)
●ODO and trip distance
●The push-assist function
●Trip time
●Backlight On/Off
●Error code indication
●Pedaling frequency indication(optional)
●USB connection indicator (optional)
●The remaining range indication(optional)
●Various Parameters Settings (e.g., wheel size, speed-limited, battery level bar,
assist level, controller limited current, password enable, etc.)
●Recover Default Settings
General Operation
◆Switching the E-bike System On/Off
Press the MODE button to switch on E-bike system and provide the power supply
for the controller. Likewise, hold the MODE button for 2s again, the E-bike system will be
switched off .The E-bike system no longer uses the battery power.
When the 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.
Trip km
PAS level/Push assist
Mode option
Mode reminder
Headlight
indication
USB charging
Speed digital display
Battery power
Motor power

◆Display Interface
After switching on the E-bike system, the display will show Current Speed and Trip
Distance by default.
Press the “MODE” button will show more riding data shown below:
Max. Speed (Km/h)→ Avg. Speed (Km/h) →Trip Time (Min.) →ODO(km)→Max.
Speed(Km/h)
Display interface

◆Switching Push-assist Mode On/Off
To activate the push-assist function, keep holding “-” button. After 2 seconds , E-bike is
activated to go at a uniform speed of 6 Km/h while the screen displays .
The push-assist function is switched off as soon as you release the “-” button. The E-bike
system stop the power output immediately.
Push-assist Mode
■Push-assist function may only be used when pushing the E-bike. Be aware of
danger of injury when bike wheels do not have ground contact while using the
push-assist function.

◆Switching the Lighting On/Off
To switch on E-bike headlight, hold the “UP” button for 2s. The backlight brightness is
automatically reduced. Likewise, press the “UP” button for 2s, the bike light can
be switched off.
Switching the Lighting Mode On/Off Interface
◆Assist Level Selection
Press "+" or "-" button to switch the E-bike system assist level, change the motor
output power, The default assist level 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.
When you reach “5”, press the "+" button again, the interface still shows “5”, and blinks
at“5”to indicate the power highest. After the power downshift reaches “0”, press the "-"
button again, the interface still shows “0”and blinks at “0” to indicate the power minimum.
The default value is level “1”.
Assist Level Interface

◆Battery Indicator
The five battery bars represent the capacity of the battery.The five battery bars bright
when the battery is in full voltage. When the battery is in low voltage, battery frame will
flash at the frequency of 1HZ to give a notice that the battery needs to be recharged
immediately.
Battery Indicator
◆Motor Power Indicator
The power of the motor is shown via digital display.
Motor Power Indication 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.
Here is the detail message of the error code in Attached list 1.
Error Code Indication
■Make the display repaired when an error code appears. E-bike will not be able to drive
normally.
General Settings
Press the power button to switch on the display.
To access setting menu, hold both the “+” button and the “-” button simultaneously
for 2s.

Setting interface
▉All the Settings are operated in the case of a parked E-bike.
◆Trip Distance Clearance
Clear Trip represents trip distance clearance setting.
To clear trip distance, press the “+” button or the “-” button to select the Yes or No.
Yes represents clearing a single ride distance. No represents not clearing a single ride
distance.
To store a changed setting, press the “MODE” button and then access General
Settings interface.
Trip Distance Clearance Settings Interface
◆Unit km/mile Conversion
Toggle Unit represents unit settings.
To convert unit, press the “+” button or the “-” button to choose the desired setting
item, and then press the “MODE” button to confirm.

To store a changed setting, press the “MODE” button and then exit Display settings.
The default value is “Metric(km)”.
Mile and Kilometer Conversion Settings Interface
◆Wheel Diameter Settings
Wheel Diameter represents wheel diameter settings. To change basic settings, press the
“+” or the “-” button to increase or decrease until the desired value is displayed. The default
value is 26 inch. To store a changed setting, press the “MODE” button to confirm, display
"OK" words prompt operation is completed. Then access the General Settings interface.
Wheel Diameter Settings Interface
◆Speed-limit Settings
The default value is 25Km/h.
Speed Limit represents the limit speed settings. When the current speed is faster
than speed limit, the E-bike system will be switched off automatically. Speed limit range
is 12Km/h to 40Km/h.
To change basic settings, press the “+” or the “-” button to increase or decrease until
the desired value is displayed. Press the “MODE” button to confirm, display "OK" words
prompt operation is completed.

To store a changed setting and exit General Parameter Settings, hold the “MODE”
button for 2s
Limit Speed Settings Interface
◆Battery Power Bar Settings
Set Voltage represents voltage settings. Each bar represents a voltage value. 5 bars
voltage values must be entered one by one. For example, VOL 1 is first bar voltage value.
The default value is 31.5V.
To set battery power bar, press the “+” or the “-” button to increase or decrease the
number. To store a changed setting and access the second bar, press the “MODE”
button.
In the same manner, after 5 bars voltage values is entered, hold the “MODE” button
to confirm and then return to the previous menu.
Battery Settings Indicator Interface
◆assist Level Settings
assist Level Option
Set Power represents assist-level settings. In assist level settings, there are 8
modes to choose：0-3, 1-3, 0-5, 1-5, 0-7, 1-7, 0-9, 1-9. The default value is 0-5.
To change the mode of assist-level, press the “+” or the “-” button to choose the

desired mode, and then press the “MODE”button to confirm, then access the General
settings page automatically.
PAS Mode Option Interface
PAS Ratio Settings
To modify the value of PAS ratio, press the "+" button or "-" button to choose the
desired value, and then press the "i" button to confirm
For example, the range is “50 percent” of “1” level, percentage value can be
modified, and the default value is 50 percent.
To store the modified setting, press the “MODE”button and turn to the next PAS
ratio settings.
After all PAS ratios were input, hold the “MODE”button for 2s to confirm and then
return to previous menu.
Please refer to Attached list 2.
PAS Ratio Settings Interface
◆Controller Over-current Cut Settings
Set Current 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 “MODE”button and then return to previous menu.
Current Settings Interface
◆Power Assistant Sensor Settings
Assistant num represents the sensitivity of PAS settings. The sensitivity value is “5”
to “24”.
To store a changed setting, press the “MODE”button and then access the
general settings. To change the sensitivity of PAS settings, press the “+” or the “-”
button to choose
sensitivity value.
The Sensitivity of PAS Settings
◆Speed Sensor (optional)
Speed Sensor represents speed sensor settings. The default value is 1
To change speed sensor settings, press the “+” or the “-” button to select the quantity

of magnet heads (the range is from 1 to 15).
To store a changed setting, hold the “MODE”button and then return to previous
menu.
Speed Sensor Selection
◆Backlight Brightness Settings
Set Backlight represents backlight settings. Level “1” is low brightness, Level “5” is
high brightness. The default level is “1”.
To modify the backlight brightness, press the “+” button or the “-” button to choose
the desired brightness level.
To store a changed setting, press the “MODE ”button and then access the
General settings interface.
Backlight Brightness Settings Interface
◆Power-on password settings:
Press UP/DOWN button to choose ‘Password’ and press MODE to confirm. Meanwhile
press UP/DOWN button to choose ‘Start Password’ and press MODE to confirm. Press

UP/DOWN to shift from ‘OFF’ to ‘ON’. Refer to below steps to toggle ON and OFF.
Power-on password input settings interface
◆Power-on password enable/disable
In “Start PassWord” interface, choose ‘ON’ and short press( less than 0.5S) MODE to confirm.
Meanwhile, display interface prompts for a password. Press UP/DOWN button to shift numbers
from 0 to 9 and press MODE to confirm and input the next digit. After the input is done, the
interface will prompt for entering the password again. If two inputs are consistent, the system
prompts that the password is set successfully. If two inputs are inconsistent, the first input is to
be repeated and confirm the new password again. The interface will be redirected to original
settings page 2 seconds after the password is set successfully. Hold MODE for more than 2
seconds to exit to the main page or by route’ BACK’ →’EXIT’. The operation steps are as follows:
Password enable/disable confirmation interface

◆Password Reset.
When password is enabled. ‘Reset password’ will add to Password interface. Press(less
than 0.5s) UP/DOWN button to choose ‘Reset Password’ and press( less than 0.5s) MODE
to confirm. Meanwhile, the interface prompts for current password input. The display will be
powered off automatically when the password is entered incorrectly after 10 inputs. When a
correct password is input, the interface prompts for a new password. Then follow the
operations of setting a new password. The interface will be redirected to original settings
page 2 seconds after the password is reset successfully. Hold MODE for more than 2
seconds to exit to the main page or by route’ BACK’ →’EXIT’. The operation steps are as
follows:
Password reset interface

◆Password Disable
In “Start PassWord” interface, choose ‘OFF’ and short press( less than 0.5S) MODE to confirm.
Meanwhile, display interface prompts for a password. The display will be powered off
automatically when the same password is entered incorrectly after 10 inputs. When a correct
password is input, the display will give a prompt of ‘password function disabled’. After 2 seconds,
the interface will be redirected to original settings page. Hold MODE for more than 2 seconds to
exit to the main page or by route’ BACK’ →’EXIT’. The operation steps are as follows:
■
■If there ain’t any operations in one minute, display will exit the settings interface
automatically.
◆Exit Settings
In the settings state, press the “MODE” button (short than 2s) is to confirm the input.
Hold the “MODE” button (for more than 2s) is to store the settings, and then exit the
current settings. Hold the “-” button is to cancel the operating but not storing settings data,
and then return to previous menu.
■If there is not any operations in one minute, the display will exit the settings state.
Quality Assurance and Warranty Scope
ⅠWarranty
（1）The warranty will be valid only for products used in normal usage conditions.
（2）The warranty is valid for 24 months after the shipment or delivery to customers
ⅡThe following cases 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、The fault or damage of the display is caused by the force majeure (e.g., fire,
earthquake, etc.).
6、Beyond Warranty period.
◆Connection Layout

Connector wire sequence
Connector to controller
Display end
Connection wire end
to display end
wire sequence table
Wire
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:
◆Use the display with caution. Don’t attempt to release or link the connector when battery is
on power.
◆Try to avoid hitting the display.
◆Don’t modify system parameters to avoid parameter disorder.
◆Make the display repaired when 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

Attached list 1：Error code definition
Attached list 2：PAS level ratio default value table
level
PAS level
options
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%
Error Code
Definition
21
Current Abnormality
22
Throttle Abnormality
23
Motor Phase Abnormality
24
Motor Hall Signal Wire Abnormality
25
Brake Abnormality
30
Communication Abnormality