Shenzhen RelFar Intelligent Technology Co.

,
Ltd.

FWH20-C20A Intelligent Handheld

Cleaning Head

Shenzhen RelFar Intelligent Technology Co., Ltd.

Shenzhen RelFar Intelligent Technology Co.,Ltd.
Website: www.relfar.com
Tel.: 0755-23143635
Address: Factory, Area B, Haiweijingsong, Lusiyuan 1 District,
Qiaohe Road, Heping Community, Fuhai Sub-district, Bao'an
District, Shenzhen City, Guangdong Province
Date of issue: Dec. 26 2022 Version: A

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Foreword

Thank you for choosing our products!

To enable you to have an overall understanding of our

company, there is a detailed introduction regarding features,
structural features, technical parameters, instructions for use and
maintenance of the product in the Manual. Carefully read the
Manual to help you better us it before the product is used.

Due to constant update of product functions, the product

you received may differ from the description in the manual. We
hereby express our deep sorry for this matter! In case of any
question in the use process, timely call us for consultation, and
we will offer dedicated service to you wholeheartedly.

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目录
Chapter I Overview ................................................................................................................................................ 5
1.1 Product parameters .................................................................................................................................5
1.2 Precautions ............................................................................................................................................... 5
Chapter II Structural Characteristics ..................................................................................................................6
2.1 Product structure .....................................................................................................................................6
Chapter III Product Installation ...........................................................................................................................8
3.1 Pipe connection .......................................................................................................................................8
3.1.1 Cooling water: The 6mm air tube is connected. The main function is that the excess
heat is taken away by cooling through the internal structural member water route when the
heat is produced by the light path in the cavity to ensure the cleaning performance. The series
connection of cooling water pipeline is required, with one-in and one-out water circulation
connected.........................................................................................................................................................9
3.1.2 Maintained gas: The 6mm air tube is connected for butt welding gas protection, with
input pressure＜0.5～0.8MPa. ...................................................................................................................9
3.2 Optical fiber input installation ..........................................................................................................10
Chapter IV Maintenance.....................................................................................................................................13
4.1 Structure of optics lens ....................................................................................................................... 13
4.2 Cleaning of optics lens ....................................................................................................................... 14
4.3 Disassembly and assembly of optics lens ...................................................................................... 16
4.3.1 Disassembly and assembly of collimation lens ........................................................................ 16
4.3.2 Disassembly and assembly of focus lens ....................................................................................17
4.3.3 Disassembly and assembly of protective glass ......................................................................... 18
Chapter V Laser Cleaning System ................................................................................................................... 20
5.1 Installation Dimension Drawing for Product ................................................................................20
5.1.1 Installation dimension of touch screen........................................................................................20
External dimension (209.5*150*24)mm ...............................................................................................20
5.1.2 Installation dimension of mainboard ........................................................................................... 21
Chapter VI Electrical ...........................................................................................................................................22
6.1 Table for Electrical Materials ........................................................................................................... 22
6.2 System wiring ....................................................................................................................................... 23
6.3 CN5 power supply interface ..............................................................................................................24
6.4 CN1 wire feeder interface ..................................................................................................................24
6.5 CN2 laser interface .............................................................................................................................. 25
6.6 CN3 temperature sensor interface ....................................................................................................26
6.7 HMI touch screen interface ............................................................................................................... 26
6.8 CN4 reserved serial interface ............................................................................................................26
6.9 CN6 external start and safety lock interface ................................................................................. 27
6.10 CN7 common input interface 1...................................................................................................... 28
6.11 CN8 common output interface ....................................................................................................... 28
6.12 CN9 common input interface 2...................................................................................................... 29

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6.13 Galvanometer interface .................................................................................................................... 30
Chapter VII Introduction To HMI Operation ................................................................................................ 31
7.1 Introduction to HMI function ............................................................................................................31
7.2 System parameter setting ................................................................................................................... 32
7.3 Equipment parameters ........................................................................................................................ 33
7.4 Alarm message ..................................................................................................................................... 34
Chapter VIII Processing Module Switching ..................................................................................................35
8.1 Temperature parameter setting of protective glass ......................................................................35
8.2 Bluetooth APP monitoring ................................................................................................................ 35

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Chapter I Overview
1.1 Product parameters
Name Intelligent Handheld Cleaning
Head
Model FWH20-C20A
Fiber interface QBH
Wavelength scope 1070±20nm
Rated power ≤3000W
Collimation focal length F50mm
Focus focal length F600mm
Scanning width 0～300mm
Scanning speed 20000mm/s
Auxiliary pressure ≥0.5～0.8Mpa
Effective clear aperture Ø22
Weight 0.78Kg

1.2 Precautions
※ Before the laser prsents, the front end flip cover plate is
required to be opened.
※ To ensure personal safety, please wear the special fiber
laser protective glasses before operation.

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※ It's necessary to keep the product clean and prevent the
cooling liquid, condensate water or other foreign matter from
intruding into the cavity, or the functional contamination and
functional impact of related parts will be incurred.

Chapter II Structural Characteristics

2.1 Product structure

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Protection drawer module

Galvanometer motor module

Dust blocking module

Focus drawer module

Switch button

Collimating drawer module

Cooling water and gas interface

QBH Interface

Cooling water (outlet)

Lens monitoring protection display lamp

Gas interface

Cooling water (inlet)

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Chapter III Product Installation
3.1 Pipe connection
Cooling water circuit and auxiliary protective gas
connection

6mm water pipe (outlet)

6mm water pipe (inlet)

6mm water pipe (inlet)

Connection of cooling water and protective gas and usage

requirements:
Notes: Gas for regular use: Compressed air (oil-water
filtration required)
Gas for regular use: Argon, nitrogen and compressed air
(oil-water filtration required).

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3.1.1 Cooling water: The 6mm air tube is connected. The
main function is that the excess heat is taken away by cooling
through the internal structural member water route when the
heat is produced by the light path in the cavity to ensure the
cleaning performance. The series connection of cooling water
pipeline is required, with one-in and one-out water circulation
connected.
3.1.2 Maintained gas: The 6mm air tube is connected for butt
welding gas protection, with input pressure＜0.5～0.8MPa.

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3.2 Optical fiber input installation
※ The QBH is a horizontal arrangement to take out the
dustproof seal cover.

Take out the

dustproof seal
cover

※ Align the red dot on the fiber optic head with the QBH
red dot, and slowly insert the fiber optic head into the QBH.

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Insertion for installation based on

the alignment of two central red dots

※ The QHB is screwed to the locking state: Rotate it to the

limiting position clockwise (hearing the "click"), lift up the
rotating mantle, and clockwise rotate the mantle until the head
of optical fiber is compressed.

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Clockwise is locked

Anticlockwise is
loosening

※ Before the laser presents, open the front end clamshell

dust blocking plate! ！

Flip opened

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Chapter IV Maintenance
4.1 Structure of optics lens
※ The assembly is completed in the dust-free plant at the
time of replacement of parts. In principle, except for the
front-end first protective glass can be disassembled and
assembled, other modules are forbidden to be dismounted. If it is
necessary to check the collimation lens, focus lens and galvanometer

lens, the product shall be put into a clean environment for

disassembly.

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Protective glass D30*2

Focus lens D20*F600

Reflector 27*14*2

Collimation lens D16*F50

4.2 Cleaning of optics lens

※ When the optics lens are cleaned, the operation method
and attention points are as follows:

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※ Tools: dust-free gloves or dust-free fingerstall, dust-free
wiping cotton swab, isopropyl alcohol, and caned dry and pure
compressed air.
※ Spray the isopropyl alcohol onto the dust-free cotton
swab, align the lens to eyes, gently pinch the side edge of the
lens with left thumb and index finger and hold the dust-free
cotton swab with right hand to gently wipe the front and back of
the lens in a single direction from bottom to top or from left to
right (avoid wiping back and forth to avert the secondary
contamination of lens), blow the surface of the lens with filling
dry and pure compressed air and confirm the surface of lens is
free from foreign matters after cleaning.

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4.3 Disassembly and assembly of optics lens

4.3.1 Disassembly and assembly of collimation lens

Tool: 2mm inner-hexagon wrench, dust-free cotton swab,

alcohol.
※ The disassembly and assembly shall be completed in a
clean place. When the lens are dismounted, the dust-free gloves
or dust-free fingerstall.
※ Disassembly and assembly steps:
Step 1: Clean up all the dust on the surface of the laser head
firstly.
Step 2: Loosen the 4-M2.5*6 screw in the figure with 2mm
inner-hexagon wrench.
Step 3: Take out the collimating drawer module and seal the port
with textured paper to prevent the dust from entering the cavity.
Step 4: When the two bosses are aligned with the opening slot
after the gland is rotated anticlockwise, remove them upward
and replace the lens. (Note that the orientation of lens
installation can be divided into plane and convex surface. After
disassembly, record it; otherwise, the optical path will be
affected.)

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Gland

Collimating drawer
This is a plane

Collimation lens D16*F50

4.3.2 Disassembly and assembly of focus lens

Tool: 2mm inner-hexagon wrench, dust-free cotton swab,
alcohol
※ The disassembly and assembly shall be completed in a
clean place. When the lens are dismounted, the dust-free gloves
or dust-free fingerstall.
※ Disassembly and assembly steps:
Step 1: (figure 1) Loosen the lateral 2-M2.5 screws.
Step 2 : Remove the focus drawer assembly horizontally
and seal the exposed sealing surface of the cavity with textured
paper to prevent dust from entering.
Step 3: (figure 2) When the two bosses are aligned with the
opening slot after the gland is rotated anticlockwise, remove

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them upward and replace the lens. (Note that the orientation of
lens installation can be divided into plane and convex surface.
After disassembly, record it; otherwise, the optical path will be
affected.)

Gland

Focus drawer

This is a plane

Focus lens D20*F600

Figure
Schema

4.3.3 Disassembly and assembly of protective glass

※ The disassembly and assembly shall be completed in a

clean place. When the lens are dismounted, the dust-free gloves
or dust-free fingerstall.
Change the protective lens

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The first step is to take both sides of the drawer in hand and pull
out the protective drawer seat upward. After taking it out, seal
the window exposed on the cavity with textured paper to prevent
dust from entering.
Step 2,
When the two bosses are aligned with the opening slot after the
gland is rotated anticlockwise, remove them upward and replace
the lens.

Gland

Protective glass D30*2

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Chapter V Laser Cleaning System
5.1 Installation Dimension Drawing for Product

5.1.1 Installation dimension of touch screen

External dimension (209.5*150*24)mm
The installation dimension of the touch screen is shown in the following figure:

Rear View Left View

Top View

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5.1.2 Installation dimension of mainboard

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Chapter VI Electrical
6.1 Table for Electrical Materials
List
Graphical
S/N Name Quantity Remarks
representation

Intelligent Handheld
1 1PCS
Cleaning Head

2 24V power pack 1PCS

3 15V power pack 1PCS

4 Display screen 7 inches 1PCS

Touch screen 4-core

5 connecting 1PCS
line-1.5m-black

Handheld laser welding

6 1PCS
system V2

7 Bluetooth antenna 1PCS

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6.2 System wiring

The following figure is a schematic diagram for wiring of the whole
system. Refer to the schematic diagram for system wiring. Refer to
relevant chapters for detailed interface definition.

Wire feeder
Temperature sensor

±15V DC power
Blowing+

alarm input
Water-cooling machine
Blowing -

supply
Starting switch-

Starting switch+

Safety lock+
input
Underpressure alarm

Safety lock-

Connecting to the ground or enclosure

24V DC power supply

Note:
Don't connect the reserved pin in the mainboard.

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6.3 CN5 power supply interface

The power supply interface falls into 6PIN green terminal, providing
a power interface for mainboard and galvanometer externally, with
voltage: DC 24V (DC 24V) and DC ±15V (DC ±15).
Table 6.3.1 shows the definition of power supply interface.
Table 6.3.1
Pin Signal Definition Description

+24V external power input and power supply

1 24V+ Power input
output current: above 3A

Power reference
2 24V- —
ground

External shielding
3 PGND Generally connecting to ground or enclosure
ground

+15V external power input and power supply

4 +15V Power input
output current: above 3A

Power reference
5 GND —
ground

-15V external power input and power supply

6 -15V Power input
output current: above 3A

6.4 CN1 wire feeder interface

The wire feeder interface CN1 is a 8PIN green terminal, supporting
motor wire feed and IO wire feed. Table 6.4.1 shows the definition of
wire feeder interface.
Table 6.4.1
Pin Signal Definition Description

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Motor wire feed pulse Used for motor wire feed and connection
1 Pulse+
+ interface with driver PUL+

Motor wire feed pulse Used for motor wire feed and connection
2 Pulse-
- interface with driver PUL-

Motor wire feed Used for motor wire feed and connection
3 DIR+
direction + interface with driver Dir+

Motor wire feed Used for motor wire feed and connection
4 DIR-
direction-interface with driver Dir-

5 GND Reference ground —

Wire feed control Used for automatic wire feed of IO control

6 Feed
interface wire feeder

Spinning control Used for automatic wire feed of IO control

7 Backoff
interface wire feeder

8 OVCC +24V power output Power supply, maximum output: 500mA

6.5 CN2 laser interface

The laser interface is a 8PIN green terminal. Table 6.5.1 shows the
definition of laser interface.
Table 6.5.1
Pin Signal Definition Description

1 PWM+ Modulating signal+ Duty ratio: 1%-99% (adjustable), 24V level

2 PWM- Modulating signal- Duty ratio: 1%-99% (adjustable), 24V level

0-10V analog voltage, used for laser peak power

3 DA Analog voltage output
adjustment

Power reference Generally connecting to DA- and Enable-end

4 GND
ground

5 OVCC +24V power output Power supply, maximum output: 500mA

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6 Enable Laser enabling signal 24V level and high level: effective

Laser failure alarm —

7 Alarm
input

The signal is needed by part of lasers. The function

8 GATE Red light index signal
is reserved for use when leaving the factory

6.6 CN3 temperature sensor interface

The temperature sensor interface CN3 is a 4PIN green terminal. Table
6.6.1 shows the definition of temperature sensor. The user directly inserts
the supporting connection line with terminal.
Table 6.6.1
Pin Signal Definition Description

1 +5V_out Sensor P port +5V Power supply, maximum output: 5mA

2 Light Sensor L port —

3 Temp Sensor T port —

4 GND Sensor G port —

6.7 HMI touch screen interface

The HMI interface is a 4PIN green terminal and power supply to and
communication with HMI by the mainboard are performed via the port.
Table 6.7.1 shows the definition of HMI interface.
Table 6.7.1
Pin Signal Definition Description

1 OVCC +24V power output, 500mA Panel power supply

Connecting to the HMI sending Serial port communication TXD signal

2 TXD_HMI
end

Connecting to the HMI Serial port communication RXD signal

3 RXD_HMI
receiving end

4 GND Power reference ground —

6.8 CN4 reserved serial interface

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The reserved serial port CN4 interface falls into 4PIN green terminal,
with no connection reserved. Table 6.8.1 shows the definition of CN4
interface.
Table 6.8.1
Pin Signal Definition Description

+24V power output, Power supply

1 OVCC
500mA

2 TXD TXD signal Serial port communication TXD signal

3 RXD TXD signal Serial port communication RXD signal

4 GND Power reference ground —

6.9 CN6 external start and safety lock interface

The CN6 interface is a 4PIN green terminal. Table 6.9.1 shows the
definition of CN6 interface.

Table 6.9.1
Pin Signal Definition Description

Generally connecting to the start button switch on

1 GND Reference ground
the plumb joint-

External start switch Generally connecting to the start button switch on

2 Start
input the plumb joint+

The pin must be connected to the safety clamp and

Safety clamp signal
3 Injector the safety clamp shall be clamped onto the metal
input
material before welding.

The pin must be connected to the nozzle of the

Safety lock signal
4 Interlock handheld head. The nozzle touches the metal
input
material at the moment of welding.

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6.10 CN7 common input interface 1

The CN7 interface is a 6PIN green terminal and of NPN type. Table
6.10.1 shows the definition of CN7 interface.
Table 6.10.1
Pin Signal Definition Description

1 GND Reference ground —

Water-cooling
2 Cool
machine alarm input

3 GND Reference ground —

4 Input1 Reservation —

5 Input2 Reservation —

6 Input3 Reservation —

6.11 CN8 common output interface

The CN8 interface is a 6PIN green terminal. The OC output can be
used to directly drive the relay and the maximum current can reach to
500mA. Table 6.11.1-Schematic Diagram for Wiring is as follows:

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Mainboard

24V relay

Schematic Diagram for Output Port Relay Wiring

Table 6.11.1
Pin Signal Definition Description

1 OVCC +24V power output Power supply, maximum output: 500mA

2 Auxi.air Protective gas Used for protective gas blowing control

3 Output1 Green light —

4 Output2 Red light —

5 Output3 Buzzer —

6 OVCC +24V power output Power supply, maximum output: 500mA

6.12 CN9 common input interface 2

The CN9 interface is a 4PIN green terminal. Table 6.12.1 shows the
definition of CN9 interface.
Table 6.12.1
Pin Signal Definition Description

1 GND Reference ground —

2 Input4 Underpressure alarm

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input

3 Input5 Reservation —

4 OVCC +24V power output Power supply, maximum output: 500mA

6.13 Galvanometer interface

The system provides two DB9 galvanometer interfaces, one DB9
male and one DB9 female.

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Chapter VII Introduction To HMI Operation
7.1 Introduction to HMI function
As for the handheld laser welding system operation panel (hereinafter referred to
as "HMI"), the 7cun configuration TFT touch screen is used, with beautiful interface
and convenient operation. The laser-related parameters can be set, respectively and
the real-time display of input/output IO state, alarm information and running state can
be realized on the main interface.
Refer to the following figure for the HMI main interface.
Main interface of HMI

Safety lock Undervoltage alarm

Parameter No Flow alarm Laser alarm

Temperature XXX℃ Galvanometer alarm

Scanning speed

System setting Red light | on

Laser power

Laser frequency

Duty ratio

Second length:
Stop cleaning

[Bluetooth mark]: Display whether the bluetooth matching connection between the equipment and

the mobile terminal is conducted.

[Scanning parameter]: Used to set the parameters related to the scanning processing of the

galvanometer.

Parameter No: Multiple groups of different cleaning parameters can be set with different

parameter numbers.

Scanning speed: It is used to set the scanning speed of the galvanometer.

Laser power: It is used to set the percentage of the peak power of the laser.

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Laser frequency: It is used to set the PWM frequency of the laser.

Duty ratio: It is used to set PWM signal duty ratio of continuous laser.

Scanning length: It is used to set the length of the laser scan.

[System Settings]: Click to enter the system setting page and modify system function parameters.

[Alarm State Area]: After the alarm signal is enabled, the real-time display of protective gas

undervoltage alarm, cold water flow alarm, laser alarm and temperature alarm, and galvanometer

state is conducted. The real-time display of safety lock state will arise when the safety lock is

enabled; When the alarm signal isn't triggered, the corresponding alarm state will turn into blue;

When the alarm occurs, the corresponding alarm icon will flicker between red light and blue light.

[Red light | switch on/off]: The red light switch can control the switch of the laser red light

indication.

[preparation \ stop | cleaning]: Emission of laser can be allowed or forbidden by the button. In a

state ready to clean, press the cleaning start button will be laser cleaning; Under the stop cleaning

state, press the cleaning start button will not produce light cleaning.

7.2 System parameter setting

System parameter setting, The modification takes effect after being saved.

Double click light extraction enabling: Switch off the enabling function. Click the button

once and the laser will come out. Switch on the enabling function. Double click the button twice

and the laser will come out.

Air release delay: Delay in enabling gas can be set when processing is enabled. The

emission of laser will start after blowing is delayed for a period of time by pressing the external

start button.

Air close delay: Delay in closing gas can be set when processing is stopped. Stop blowing

after stopping laser emission, and then delaying for a period of time when processing is stopped.

Scale factor: This parameter is used to set the maximum range of the galvanometer. The

value must be consistent with the actual range of the galvanometer; otherwise, the actual length

and width of the light output may be inaccurate.

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Enabling the safety lock: Select whether to enable security lock protection.

[Chinese/2 English]: Switch between Chinese and English languages.

Automatic screen lock: When the automatic screen lock is enabled, the system

automatically switches to the screen lock page when no operations are performed on the

touchscreen after a period of time.

[Authorization]: Perform authorization code reading and decryption operations, and display

the information about the panel and mainboard version numbers.

7.3 Equipment parameters

[Equipment parameters]: It is used to limits the maximum and minimum parameters. This

parameter limits the laser parameters, only by entering the password to enable it. After the

parameter is changed, it must be saved to take effect.

Maximum scanning speed: It is used to set the maximum oscillating speed of the

galvanometer

Minimum scanning speed: It is used to set the minimum oscillating speed of the

galvanometer

Maximum scanning speed: It is used to set the maximum scanning length allowed by the

equipment

Minimum scanning speed: It is used to set the minimum scanning length allowed by the

equipment

Laser rated power: It is used for setting the rated power of the laser.

Maximum laser frequency: It is used to set the maximum laser frequency

Minimum laser frequency: It is used to set the minimum laser frequency

Laser alarm enabling: It is used to set whether to enable laser alarm. If this parameter is

enabled, a laser alarm will be generated when the laser alarm input triggers the alarm.

Laser alarm electrical level: It is used to set the laser alarm that triggers the electrical level

logic.

Water-cooling machine alarm enabling: It is used to set whether to enable water-cooling

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machine alarm. If this parameter is enabled, a water-cooling machine alarm will be generated

when the water-cooling machine alarm input triggers the alarm.

Water-cooling machine alarm electrical level: It is used to set the water-cooling machine

alarm that triggers the electrical level logic.

Undervoltage alarm enabling: It is used to set whether to enable gas undervoltage alarm. If

this parameter is enabled, a undervoltage alarm will be generated when the undervoltage alarm

input triggers the alarm.

Undervoltage alarm level: It is used to set the undervoltage alarm that triggers the electrical

level logic.

Temperature alarm enabling: It enables the lens temperature alarm. When the temperature

exceeds the limit value, an alarm signal will be generated.

Temperature alarm limit: Lens temperature limit value.

7.4 Alarm message

Alarm information includes: Safety clamp alarm and machine alarm.

Safety clamp alarm lies in that the safety clamp and cleaning head is not reliable conduction.

Machine alarm includes 3 alarms, laser alarm, water-cooling machine alarm, undervoltage

alarm. In the alarm information interface, it can display multiple alarm information, up to 3 pages,

and it can switch through the previous page and the next page.

When the alarm is triggered, the output of the laser will be stopped and the galvanometer will

stop moving at the same time, and the corresponding alarm information will be prompted. The

user can check the related hardware problems according to the alarm prompt and remove the

alarm. When the alarm is lifted, the alarm record of the machine alarm will still exist in the alarm

information. At this time, you can manually clear the alarm by entering the alarm information

interface. If the alarm is not lifted, the alarm will continue to prompt when it is manually cleared.

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Chapter VIII Processing Module Switching
8.1 Temperature parameter setting of protective glass
[Home Page]→[System Parameter]→[Equipment Parameter]→[Input Password:
666888] →next page→ lens temperature alarm limit value.
It's suggested to set the set value of lens temperature to 50. After the lens temperature
exceeds the set value, the alarm caution will arise on the home page and the display
light on the side of the handheld plumb joint will turn to red.

Laser alarm enabling Disabling

Lens temperature alarm enabling: Disabling

Laser alarm level Low level

Lens temperature alarm limit value

Underpressure alarm enabling Disabling

Cooling-water machine alarm Disabling
enabling

Underpressure alarm level Low level

Cooling-water machine alarm level Low level

Accumulative time of laser emission Clear

Accumulated boot time Clear

Page up Return

8.2 Bluetooth APP monitoring

In case of use for the first time, it's necessary to download the Farguard

applet which can be used to contact the after-sales customer service

personnel. Notes: The APP now only supports the mobile phone with

Android operating system. The applet icon is as follows:

Monitoring home screen, welding system, cleaning system and selection

as per the use category.
The current usage can be viewed by the equipment state page.

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Home screen Equipment status

Equipment status

Welding system Safety lock

Laser alarm

Underpressure alarm
Cleaning system
Flow alarm

Temperature alarm

Language

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Thank you for using the intelligent technology product of Shenzhen

RelFar!
Website: www.relfar.com
Tel.: 0755-23143635
Address: Factory, Area B, Haiweijingsong, Lusiyuan 1 District,
Qiaohe Road, Heping Community, Fuhai Sub-district, Bao'an
District, Shenzhen City, Guangdong Province

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