Lukas LK-350-12/24VT User manual

※ Be sure to read this manual carefully to ensure proper usage.
※ Some functions can be changed without notifying users in order to
improve product performance.
※This manual is written based on LK-350-12/24VT of Qrontech Co., Ltd
and may include technical or editorial errors and/or omissions.
※When using blackboxes of other companies that have low voltage
cut-off function, disable low voltage cut-off function or set to lowest
cut-off voltage so as to make efficient use of power safety device.
※Make sure ACC wire is connected to ACC power supply of the vehicle;
if it is used together with B+ wire (continuous power voltage), continuous
power may not be cut off. Make sure to separate ACC power supply.
(Qrontech takes no responsibility for malfunctions arising from wire
connection errors.)
LK-350-12/24VT

1. Precautions for Use ………………………………………… 3
2. Product Package …………………………………………… 4
3. Product Characteristics …………………………………… 5
4. Parts Names & Functions ………………………………… 6
5. How To Use ………………………………………………… 8
6. How To Install ……………………………………………… 13
7. Product Specification ……………………………………… 15
Table of Contents

This product went through strict quality management and inspection
processes. However, misuse of electrical products could cause fire or
human casualties. Observe precautions written before use.
※ Check operation status of the product regularly.
※ Set input voltage according to season and battery status.
(e.g., Spring, Summer - 12.0V/24.0V , Winter - 12.4V/24.8V)
※ Battery efficiency may fall dramatically as battery is sensitive to external
environments (temperatures). Therefore, operation status of the connected
external device may not be constant due to battery.
※ When the vehicle is left for a long time with the switch on, battery discharge
may take place due to dark current. Qrontech takes no responsibility for
battery discharge.
※ ±5% errors in input/output voltage may occur due to surrounding
environments (temperatures) and component errors.
※ Use fuse with rated capacity. Otherwise, a danger of fire exists.
※ In case of other malfunctions and long-term parking, turn off the switch
and stop using the device.
※ Qrontech takes no responsibility for customer mistakes/carelessness.
1. Precautions for Use
User’s Manual ... 3

- Make sure that all of the following items are present when you receive
your product.
- Product package is subject to change for improving product
performance or quality.
※ Be sure to read this manual carefully to ensure proper usage.
※Some functions can be changed without notifying users in order to
improve product performance.
※This manual is written based on LK-350-12/24VT of Qrontech Co., Ltd
and may include technical or editorial errors and/or omissions.
※When using blackboxes of other companies that have low voltage
cut-off function, disable low voltage cut-off function or set to lowest
cut-off voltage so as to make efficient use of power safety device.
※Make sure ACC wire is connected to ACC power supply of the vehicle;
if it is used together with B+ wire (continuous power voltage), continuous
power may not be cut off. Make sure to separate ACC power supply.
(Qrontech takes no responsibility for malfunctions arising from wire
connection errors.)
LK-350-12/24VT
Main Product Adhesive Tape
User’s Manual
2. Product Package
4 ... User’s Manual

- Low voltage cut-off device is for users who use the device by connecting power
supply directly to the vehicle battery and prevents battery discharge in advance
by cutting off power when battery voltage is lowered below the pre-set voltage.
- Connect the blackbox and the vehicle battery and use the device when
continuous power supply is needed (e.g., parking monitoring).
- After connecting the low voltage cut-off device, power supply/automatic low voltage
cut-off/timer functions can be used even when the engine is off.
- ACC function added to LK-350-12/24VT enables normal supply of output voltage
even when input voltage(continuous power voltage) fluctuates and drops below
cut-off voltage.
- The product has less than 100µA leakage current using optimized circuit.
- When the power switch is off, no leakage current occurs
(If the device is not in use for a long time, turn off the switch).
- This device passes through input voltage; it is not possible to set output voltage.
Input voltage is used as output voltage.
e.g., Input Voltage: 12V → Output Voltage: 11.7V
3. Product Characteristics
User’s Manual ... 5

4. Parts Names & Functions
[ Type C Product Structure ]
1-hole Cigar Socket
Fuse(250V/3A)
Set Mode Power Switch
Mode Select Enter
Digital Segment Display GND
B+
(Battery Power)ACC
6 ... User’s Manual

- Low voltage cut-off device is for users who use the device by directly connecting
power supply to the vehicle battery and prevents battery discharge in advance by cutting
off power when battery voltage is lowered below the pre-set voltage.
- Connect the blackbox and the vehicle battery and use the device when continuous
power supply is needed (e.g., parking monitoring).
- Voltage supply/automatic low voltage cut-off/timer functions can be used even
when the engine is off.
※ Vehicle rebooting (operation)/booting may delay when the engine starts according
to battery voltage and status.
※ S/W and functions may be added (changed) without notification to customers for improving
performance of the device.
Display Indication Status
Volt Mode
Time Mode
Power OFF
Display Indication
Lower Right DOT(1ea) On/Off repetition
Lower Right DOT(2ea) On/Off repetition
FND Turned Off
Input Voltage, Output Voltage
User’s Manual ... 7

8 ... User’s Manual
5. How To Use - 12VT
1/2/3/4
/5/6/7/8
12/24/36/48/
1/2/4/6 hours
KEY
Enter
Enter
KEY
Select
Select
Mode
Mode
KEY
Mode
Enter
Slide S/W
Volt Mode
Slide S/W
Volt Mode
Select
VoLt
Mode
HoUr
Mode
Number of Clicks
1
1
1 Long key
(5sec)
1
2
3
4
5
6
7
8
9
1 Long key
(5sec)
Long key (5sec)
Enter Menu Mode
Enter Menu Mode
Operation
Display Input Voltage
Display Output Voltage
12.1
12.2
12.3
12.4
11.6
11.7
11.8
11.9
12
Initialize settings

User’s Manual ... 9
12/24/36/48/
1/2/4/6Hr
Set cut-off at input voltage under 11.8V
in 12/24/36/48/1/2/4/6 hours
※ Voltage setting at less than 11.8V is not recommended.
C 12.0
12Hr
Display
Display Voltage
Display Voltage
12.1
12.2
12.3
12.4
11.6
11.7
11.8
11.9
12
rEs
Display standard cut-off setting at 12V
Display cut-off setting 12 hrs after
standard cut-off setting
Operation Contents
Display Input Voltage
Display Output Voltage
Set cut-off at input voltage of 12.1V
Set cut-off at input voltage of 12.2V
Set cut-off at input voltage of 12.3V
Set cut-off at input voltage of 12.4V
Set cut-off at input voltage of 11.6V
Set cut-off at input voltage of 11.7V
Set cut-off at input voltage of 11.8V
Set cut-off at input voltage of 11.9V
Set cut-off at input voltage of 12V
Cut-off voltage: 12V / Timer: 12 hours
KEY
Mode
Enter
Slide S/W
Volt Mode
Slide S/W
Volt Mode
Select
VoLt
Mode
HoUr
Mode

10 ... User’s Manual
5. How To Use - 24VT
KEY
Enter
Enter
KEY
Select
Select
Mode
Mode
KEY
Slide S/W
Volt Mode
Select
VoLt
Mode
HoUr Mode
Number of Clicks
Enter Menu Mode
Enter Menu Mode
Operation
Initialize settings
1/2/3/4/
5/6/7/8
12/24/36/48/
1/2/4/6 hours
Long key (5sec)
1 Long key (5sec)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
24.1
24.2
24.3
24.4
24.5
24.6
24.7
24.8
23.2
23.3
23.4
23.5
23.6
23.7
23.8
23.9
Slide S/W
Volt Mode
1 Long key
(5sec)
Enter
Mode
1
1
Display Output Voltage
Display Input Voltage

User’s Manual ... 11
12/24/36/48/
1/2/4/6Hr
Set cut-off at input voltage under 11.8V
in 12/24/36/48/1/2/4/6 hours
c 24.0
12Hr
rEs
Display
Display standard cut-off setting at 12V
Display cut-off setting 12 hrs after
standard cut-off setting
Operation Contents
Cut-off voltage: 12V / Timer: 12 hours
Slide S/W
Volt Mode
Select
VoLt
Mode
HoUr Mode
Set cut-off at input voltage of 24.1V
Set cut-off at input voltage of 24.2V
Set cut-off at input voltage of 24.3V
Set cut-off at input voltage of 24.4V
Set cut-off at input voltage of 24.5V
Set cut-off at input voltage of 24.6V
Set cut-off at input voltage of 24.7V
Set cut-off at input voltage of 24.8V
Set cut-off at input voltage of 23.2V
Set cut-off at input voltage of 23.3V
Set cut-off at input voltage of 23.4V
Set cut-off at input voltage of 23.5V
Set cut-off at input voltage of 23.6V
Set cut-off at input voltage of 23.7V
Set cut-off at input voltage of 23.8V
Set cut-off at input voltage of 23.9V
c 24.1
c 24.2
c 24.3
c 24.4
c 24.5
c 24.6
c 24.7
c 24.8
c 23.2
c 23.3
c 23.4
c 23.5
c 23.6
c 23.7
c 23.8
c 23.9
KEY
Slide S/W
Volt Mode
Enter Display Output Voltage
Display Input VoltageDisplay Voltage
Display Voltage
Mode
※ Voltage setting at less than 11.8V is not recommended.

12 ... User’s Manual
- When power switch is off for battery protection,
Voltage of ACC terminal Off → no voltage output
Voltage of ACC terminal On → voltage output
- In case B+ voltage is not used, On/Off change is possible with ACC
when the power switch is off.
Power On
Acc On
Acc Off
Acc On
Acc Off
Power Off
On
Off(On)
On
Off
(On) It may differ depending
on cut-off voltage
Switch
Status
Acc
Status
LK-350-12/24VT
Output Remarks

6. How To Install
User’s Manual ... 13
1. Locate the fuse box and map.
Identify fuses have power/no power when
engine’s off.
2. Identify a fuse that has no power (cigarette lighter,
audio etc.) to connect with the red ACC wire
and insert it back to fuse box.
※ Location of ACC power supply may differ depending
on the vehicle.
※ Please connect to output side if not, it cause a fire.
3. Identify a fuse that has power(e.g. emergency lamp,
indoor lamp, tail lamp etc.) to connect with the B+
wire and insert it back to fuse box.
※ Location of B+ may differ depending on the vehicle.
※ Please connect to output side if not, it cause a fire.

14 ... User’s Manual
4. Connect the black GND terminal to the grounding
parts(metal parts) and check whether the LED
segment works properly with the engine on to ensure
normal operation of the device.
5. Fix the device on the vehicle using adhesive tape
and connect it to the blackbox.
- If power is cut off by volt mode/time mode operations, it automatically
resets when the engine starts.

User’s Manual ... 15
- ±5% errors may occur due to component errors.
- Product specification may change without prior notification in accordance with
environments and circumstances.
Product Name
Model Name
Input Voltage
Output Current
Operating Temperatures
Leakage Current
Low Voltage Cut-off Device
LK-350-12/24VT
11V ~ 15V
Less than 1A
-20℃ ~ 70℃
Less than 100µA
7. Product Specification

Low Voltage Cut-off Device
LK-350-12/24VT
VER. 03
Customers Service Information
- Address: 583 Yangcheon-ro #A/1201 ,Gangseo-gu,
Seoul S Korea 157779
- Website: www.lukashd.com
- Inquiry: [email protected]
- For more information and customer service please contact
seller or manufacturer.