LOTOS CT520D Specification sheet

®
LOTOS TECHNOLOGY
www.uwelding.com
Plasma Cutter TIG Stick Welder CT520D

®
Lotos Technology CT520D
Quick Setup
Power plug wiring:
For either 110 or 220VAC, the GREEN wire is the ground wire. The WHITE and BLACK wires are hot
wires.
For Plasma Cung:
1. Wear a Lotos auto darkening plasma cung helmet
(Figure 1.1, not included in the box. To purchase, please
go to our website.) to protect your eyes from harmful
plasma cung arc radiaon and safety gloves to protect
your hands during welding.
2. Connect the machine gas inlet (on the back of the machine, Figure 1.2) with an air compressor
(Figure 1.3) and set the air pressure to 65-70 PSI. (The Air Regulator is oponal if your air
compressor has the capability to control output air pressure.)
1
Instructions
Figure 1.1
Figure 1.2 Figure 1.3
65 - 70 PSI
Power
Cord
Gas
Inlet

®
3. Connect your plasma cung torch and ground cable to the front panel of the machine. Make
sure the ground cable is connected on the right hand side where the “+” sign is located.
(Figure 1.4)
- Set TIG Weld /Sck Weld /Plasma Cut switch to Plasma Cut mode.
- Set “2.5S/5S” to “2.5S” Mode.
- Set “Machine/PEDAL” to “Machine” Mode.
- Adjust Current Dial between 10 and 50 amps.
4. Aach the ground clamp to the metal you want to cut. Grind the metal to make sure the clamp
is securely aached to the work piece. Press the trigger of the torch and make sure the air is
owing. Finally, move the torch head to the work piece and start cung.
5. Change your consumables (p, electrode, ring, and cup) if they are worn out. The consumables’
type is LCON. If you want to cut the perfect circle or perfect straight line, order a Lotos
LCK roller guider compass kits from our website www.uwelding.com.
1. Wear our auto darkening helmet and gloves to protect your eyes and hands from any harmful
welding arc. (Please see step 1 in Plasma Cung.)
2. Connect the machine gas inlet (on the back of the machine, Figure 1.5) to the argon regulator
and adjust the knob to set gas pressure between 15 and 20 min/L (an argon regulator is
necessary, Figure 1.6.)
For TIG Welding:
Figure 1.4
STICK
Welding
Clamp Plasma
Torch
Output
5-pin
Switch
Plug
Ground
Cable
2

a) If you switch from plasma cung to TIG welding quite oen,
consider buying a LOTOS 3 way valve kit to connect
both the argon tank (Figure 1.7) and the air
compressor simultaneously.
- Connect your TIG torch and ground cable to the front panel of the machine.
- Make sure the ground cable is connected on the right hand side where the “+” sign is located.
- Set TIG Weld/Sck Weld/Plasma Cut switch to TIG Weld mode (refer to Figure 1.4, page 2).
- Set “2.5S/5S” to “2.5S” mode.
- Set “Machine/PEDAL” to “Machine” mode.
- Adjust current dial from 10 to 200 amps (Figure 1.8).
Figure 1.5 Figure 1.6
Figure 1.7
Figure 1.8
Output
from
Air
Compressor
Argon
Regulator
Argon
Gas
Machine
Gas
Inlet
Air
Compressor
15-20
min/L
5-pin
Switch
Plug
TIG
Torch
Output
3

®
b) If you want to dynamically control the welding heat, please use a foot pedal (not included in the
box. To purchase, please go to our website). Then connect the “on/o” connector to your foot
pedal and leave the wire of the TIG torch unplugged.
- Set TIG Weld/Sck Weld/Plasma Cut switch to TIG Weld mode (refer to Figure 1.4, page 2).
- Set “2.5S/5S” to “2.5S” mode.
- Set “Machine/PEDAL” to “Pedal” mode.
- Adjust current dial between 10 and 200 Amp (Figure 1.9).
3. TIG torch head parts (Figure 1.10) and assembly (Figure 1.11)
(The tungsten is not included in the picture; please buy proper DC Lotos tungsten electrodes.)
Grind and sharpen the tungsten before rst use.
Figure 1.9
Figure 1.10 Figure 1.11
Foot
Pedal
with
Amp Adjusts
Ground
Cable
5-pin
Foot Pedal
Plug
TIG Torch
Output
Unplugged
4

®
For Sck/Arc/MMA Welding:
1. Wear our auto darkening welding helmet and gloves to protect your eyes and hands from any
harmful welding arc. (Please see step 1 in Plasma Cung.)
2. You don’t need to connect the machine to any gas or air supply. It’s a plug and play.
Panel connecon instrucons:
- Set TIG Weld/Sck Weld/Plasma Cut switch to Sck Weld mode (refer to Figure 1.4, page 2).
- Set “2.5S/5S” to “2.5S” mode.
- Set “Machine/PEDAL” to “Machine” mode.
- Adjust current dial between 10 and 200 amps (Figure 1.12).
Last but not least, please be sure to turn o the machine when you switch from one funcon to
another. This is important, because otherwise the machine could be damaged.
All accessories and consumables can be purchased at www.uwelding.com or Lotos’s authorized
resellers.
Thank you for your business!
Figure 1.12
Ground
Cable
Stick
Welding
Clamp

®
LOTOS Plasma Cutters
User Manual
Version: 2.0, May 2014
copyright @ Lotos Technology
www.uwelding.com is operated by Lotos Technology

For more information and more of our products,
please visit our website at
http://www.uwelding.com/
Introducon 6
Overview ................................................................................
Audience................................................................................
Safety Precauons 7
Overview .................................................................................
Cauon Recommendaons .................................................................
Avoiding Fatal Electric Shock ................................................................
Avoiding Harmful Smoke, Gases, and Vapors ..................................................
Avoiding Harmful Arc Emissions/Rays ........................................................
Avoiding Harmful Noises ...................................................................
FireorExplosion..........................................................................
Burn Protecon ...........................................................................
Protecng Eyes from Flying Metal or Dirt .....................................................
Pacemakers..............................................................................
CylinderHandling.........................................................................
Equipment 9
General Overview .........................................................................
Main Characteriscs .......................................................................
Specicaons .............................................................................
Adjustor Diagram .........................................................................
Air Regulator Conguraon ................................................................
Connecng Cables to Machine..............................................................
Installaons ..............................................................................
Instrucon Notes 19
Working Environment .....................................................................
Safety ...................................................................................
Maintenance .............................................................................
Troubleshoong ..........................................................................
Table of Contents
7
7
7
7
7
7
8
8
8
8
8
9
9
9
12
12
13
15
16
16
17
19
19
20
20
6
6
Gas Regulator Installation ..................................................................
Argon Installaon .........................................................................
Operaon ...............................................................................

®
6
Introduction
Overview
Dear Valued Customer:
Thank you for purchasing a Lotos Technology plasma cuer! Feel free to check out our other products at
www.uwelding.com.
This User Manual documents policies and procedures for proper operaon of the equipment.
IMPORTANT: Be sure to review the contents of this manual before aempng to operate the equipment.
This manual should be located where it can be easily referenced by all users of the machine.
Audience
This manual assumes that all individuals reading the manual and using the welder/cuer are able,
qualied, and/or cered to operate this type of machinery.

®
Safety Precautions - Read Before Using
Overview
Cauon Recommendaons
Arc rays from the welding process pro-
duce intense visible and invisible rays
that can burn eyes and skin. Sparks y
o from the weld.
CAUTION: Welding and arc cung
can cause bodily injury.
• Connect the machine to a UL-approved outlet
only. Do not hard wire the machine directly to
the power source.
• Wear safety goggles at all mes. This will dark-
en the arc that is generated by the machine and
protect your eyes from harmful rays.
• All machine operators should be technically
cered for welding/cung.
Avoiding Harmful Smoke, Gases, and Vapors that can injure or kill.
Avoiding Harmful Arc Emissions/Rays that can burn eyes and skin.
Avoiding Fatal Electric Shock
Protect yourself and others from injury — read and follow these precautions.
Welding produces fumes and gases.
Breathing these fumes and gases can
be hazardous to your health.
7
• Do NOT switch o the machine while machine is
in operaon for internal circuitry can be
damaged.
• Wear appropriate clothing and a welding or
cung mask to protect your eyes and skin.
• Use appropriate screen or curtain to prevent
emissions from reaching individuals near the
work area.
• Ensure that your working area contains no
ammable items; and that none are nearby.
Cauon: Welding and cung spray can ignite.
Avoiding Harmful Noises that can damage hearing.
Noise from some processes can
damage hearing.
• Wear protecve earplugs while operang
machine.
• Isolate yourself from both the
earth and the work piece.
• Make sure that your working area is
nonammable and explosive-free.

®
Burn Protecon: HOT PARTS can cause serious burns.
Protect eyes from FLYING METAL or DIRT.
PACEMAKERS AND WELDING: MAGNETIC FIELDS can aect implanted devices.
CYLINDER HANDLING: it can explode if damaged.
Welding or Cung can cause Fire or Explosion.
If you encounter any dicules during set up or operaon:
• Consult this manual.
• Contact Lotos Customer Service by vising
hp://www.uwelding.com/about-us/contact-us/.
The work piece and equipment
get hot. The hot metal, hot work
piece, and hot equipment can
cause burns.
• Welding, chipping, wire
brushing, and grinding cause
sparks and ying metal.
Electric arc welding and cung
processes produce intense electric
and magnec (electromagnec)
elds. The funcon of pacemakers
can be aected by strong electro-
magnec elds.
Shielding gas cylinders contain gas
under high pressure. If damaged,
a cylinder can explode. Be sure to
treat gas cylinders carefully.
Welding, cung, and allied pro-
cesses can cause re or explosion
if precauonary measures are not
followed.
• Use approved helmets or hand shields that
provide protecon for the face, neck, etc.
• Wear approved safety goggles or glasses with
side shields, even under your helmet.
• Wear approved safety glasses with side shields,
even under your welding helmet.
• Persons with a pacemaker should not go near
welding or cung operaons unl they have
consulted their doctors and obtained informaon
from the manufacturer of the device.
• Protect compressed gas cylinders from excessive
heat, mechanical shocks, physical damage, slag,
open ames, sparks, and arcs.
• Install cylinders in an upright posion by securing
to a staonary support or cylinder rack to prevent
falling or pping.
• Develop adequate procedures, and use proper
equipment to do the job safely.
• Keep cylinders away from any welding or other
electrical circuits.
• Wear dry, hole-free insulated gloves.
• Remove combusble materials from a sphere
with a minimum radius of 35 feet around the
work area or move the work to a locaon well
away from combusble materials.

®
Equipment
General Overview
Manufactured with advanced inverter technology, the CT520D mulpurpose unit includes the following
features: stable output, reliable, completely portable, high-eciency and low noise generated while
cung.
The CT520D mulpurpose unit oers a variety of welding and cung aspects. It is able to cut all types of
metal up to 1/2’’ with the 50A plasma cung funcon. This LOTOS mul-process welder can switch
between AC/DC TIG Weld and AC/DC STICK Weld quickly and easily. With a hand carrying weight of
32lbs, the unit is portable and reliable featuring a duty cycle of 60% at max amps on all processes.
Main Characteriscs
The LOTOS CT520D series DC TIG, MMA, and plasma cuer allows you to weld stainless steel, alloy steel
and carbon steel and other nonferrous metals.
9
• Stabilizaon
• Reliability
• Portability
• Power eciency and low noise output
• High cung speed
• Smooth cuts
General
Model name CT520D
Functions
50 A Plasma Cutter
200 A TIG Welder
200 A STICK Welder
Dimension with handle
Weight 32 lbs (14.5 kg)
Input voltage 110-220 V, 1-PH, 50/60 Hz
Power supply type Inverter- IGBT
Housing protection IP21
Insulation B
Efficiency 85%
Accessories
Plasma cutting torch 50 A, 12.5 ft. (3.81m)
TIG welding torch 200 A 12.9 ft. (3.93m)
Arc/Stick clamp 200 A 6.5 ft. (1.98m)
Argon regulator 0-250 psi
Air regulator 0-150 psi
Specicaons

Plasma
Cutting
Rated input power requirement 120-220 V, 1-PH, 27 A
+/- 15%, 50/60 Hz
Output current 10-50 A @220V
10-25 A @110V
Duty cycle @ 40°C (104°F) 60% @ 50 A
100% @ 40 A
Gas supply Clean, dry, oil-free air
Recommended gas inlet
flow rate / pressure
3.6 scfm @ 65 psi
80L/min
Max rated cutting thickness 1/2 inches (12.7mm)
DC
TIG
Welding
Rated input power requirement 120-220 V, 1-PH, 17 A
+/- 15%, 50/60 Hz
Output current 10-200 A @ 220V
10-100 A @ 110V
Material can weld Steel, Stainless, Moly, Ferrous
Duty cycle @ 40°C (104°F) 60% @ 200 A
100% @ 150 A
No load voltage 62 V
Working voltage 16.9 V
Gas supply Clean, dry, oil-free argon gas
Starting mechanism High Frequency Start / HF Welding
Recommended gas inlet
flow rate 2-5 L/M
DC
Stick
Welding
Rated input power requirement 120-220 V, 1-PH, 23 A,
+/- 15%, 50/60 Hz
Output current 10-200 A @ 220V
10-80 A @ 110V
Material can weld Steel, Stainless, Moly, Ferrous
Duty cycle @ 40°C (104°F) 60% @ 200 A
100% @ 95 A
No load voltage 62 V
Working voltage 25 V
Starting mechanism High Frequency Start / HF Welding
Specicaons
10
®

®
Torch Type Model Amperage Consumables Type
5 prong LCON
Cutting Torch CL0105 50
LCON0120
LCON0140
LCON0190
Extended 5 prong
LCON cutting
torch
CL0205 50
LCON0220
LCON0240
LCON0290
Part Number Nozzle Electrode Shield Cup Swirl Ring Package Type Total Pieces
LCON0120 LN01 LE01 LC01 LR01 LN01 x 10,
LE01 x 10 20
LCON0140 LN01 LE01 LC01 LR01
LN01 x 10,
LE01 x 10,
LR01 x 10,
LC01 x 10
40
LCON0190 LN01 LE01 LC01 LR01
LN01 x 40,
LE01 x 20,
LR01 x 20,
LC01 x 10
90
LCON0220 LN02 LE02 LC02 LR02 LN02 x 10,
LE02 x 10 20
LCON0240 LN02 LE02 LC02 LR02
LN02 x 10,
LE02 x 10,
LR02 x 10,
LC02 x 10
40
LCON0290 LN02 LE02 LC02 LR02
LN02 x 40,
LE02 x 20,
LR02 x 20,
LC02 x 10
90
Torch Type
Consumables Package
11

®
Figure 2.1: Adjustor Diagram 1
Figure 2.2: Adjustor Diagram 2
Figure 2.3:
Air Regulator Conguraon
12
Amp Display Amp Adjusting
2-step &
5-step Switch
Machine/
Pedal Switch
Function
Switch
Problem
Indicator
Connect to
Air Compressor
Air
Regulator
Power
Cord
Power
Switch
(TIG)
(Stick)
(Cutter)

®
Figure 2.3:
Plasma Cung Diagram
Figure 2.4:
TIG Welding without Foot Pedal Diagram
13
Power
Cord
Adjust to
Plasma Cut
Gas & Power
Output
Gas & Power
Output
5-pin
Plug
5-pin
Plug
Ground
Cable
Ground
Clamp
Ground
Clamp
Work
Piece
Work
Piece
Cutting
Torch
TIG Torch
220V Round Plug
220V Round Plug
Air
Compressor
Argon
Tank
Argon
Hose
Argon
Regulator
Power
Cord

®
Figure 2.6:
Arc/Sck/MMA Welding Diagram
Figure 2.4:
TIG Welding with Foot Pedal Diagram
14
220V Round Plug
Argon
Tank
Argon
Regulator
Argon
Hose
Power
Cord
Gas & Power
Output
5-pin Plug
(unplugged)
Foot Pedal with
5-pin Plug
Work
Piece
Ground Clamp
TIG Torch
220V Round Plug
Work
Piece
Ground Clamp (+)
Arc Handler (-)

®
INSTALLATION
Connect this welding & cung equipment with a power supply of 110 or 220V AC.
For the wiring, please note that:
For 110VAC,
- The green wire with yellow stripe is the ground wire
- The red/brown wire is the hot wire
- The blue/black wire is the neutral wire
For 220VAC,
- The green wire with yellow stripe is the ground wire
- The red/brown wire is posive 110VAC
- The blue/black wire is negave 110VAC
Connect the earth terminal with the earth cable (minimum diameter of 2.5 mm2.)
1. Install welding torch according to the quick setup guide.
2. Connect the one-knob connector, air plug to the corresponding connector on the panel
board; and fasten the screw.
3. Plug the air plug of the back cable to “+” of the air socket on the panel board; and fasten it in
clockwise. Connect earth clamp with work piece.
If the power switch is on, the built-in fan starts working and the current meter displays the
current value.
The funcon switch enables the machine to alternate between MMA, TIG, and CUT welding
according to the praccal welding task requirement.
1. TIG Welding Funcon
- Connect the copper nozzle in the back of the machine to the argon tank with the hose. The
gas supply system includes the gas bole, air regulator, and gas hose. Connect the parts of the
gas system rmly to prevent gas leakage.
- Install the argon torch according to the Figure 3.2.
- Connect the copper screw on the cung torch to the output terminal of the one-knob of the
front panel; and fasten it clockwise to avoid gas leakage.
- Connect the plug of the closed circuit to the “+” socket on the panel board. Connect the earth
clamp to the work piece.
Funcon Switch
Power Cord Plug Wiring
Connecon of the Output Cables
Power Supply Switch
15

®
Funcon Switch
Welding Current Output Seng
Air/Argon Regulator Installaon
2. MMA Funcon
- Connect the plug of the electrode holder to the “+” socket on the front panel.
- Connect the plug of the ground clamp to the “-” socket on the front panel.
3. Plasma Cung Funcon
- Use the gas hose to connect to one of the terminals on the air regulator and connect the
other terminals to the copper tub.
- Connect the copper nut of the cung torch to the knob on the panel board. Connect the plug
of the ground clamp to the “-”socket on the front panel.
According to praccal demand, set the parameters of the current output by the operaon of
“ARC,” “TIG,” or “CUT.”
16
25
20
15
10
5
1
SHUT
REGULATOR
AR
OPEN
Figure 3.1:
Gas Regulator Installaon
Figure 3.2:
Argon Installaon
(Unassembled)
(Assembled)

®
OPERATION
TIG Welding Funcon
1) While this welding & cung equipment is operated, the power supply indicator is on; and
the built-in fan will funcon.
2) Switch to the TIG welding funcon mode.
3) Press the gas release buon and modulate the volume of gas output to the required value.
4) Press the buon on the welding torch, and the electromagnec valve funcons. The sound
of releasing electricity is audible, and there is gas coming out of the welding torch.
Please note: Before the inial welding operaon, press the welding torch buon for several
seconds in order to remove the gas inside the gas tub, and the welding operaon can begin.
There is gas output within a few seconds aer the welding operaon, that is a special design
to protect the welding point before it cools down. Therefore, aer the arc is gone, maintain
the welding posion unl the heat produced during the welding operaon dissipates.
17
MMA Funcon
1) Switch to MMA welding mode.
2) While this welding & cung equipment is operated, the power supply indicator is on and
the built-in fan will funcon.
3) According to the thickness of the work piece, adjust the welding current output and choose
the rod, then the MMA welding can begin.
5) The welding current output is adjustable, according to the thickness of the welding material
and required crasmanship.
6) Maintain a distance of 1-4mm between the tungsten electrode and the work piece. Press the
welding torch buon. HF electricity will release between the welding electrode and the work
piece. Aer the arc starts, the splash of the HF arc will vanish and the welding operaon can
begin.