Unitor UWI 150 TP Instruction Manual

Revision date 11.02.2014
Page 1 of 20

Instruction manual

Unitor Welding Inverter

UWI 150 TP

MMA (Stick) / TIG / TIG pulse / Welder

Revision date 11.02.2014
Page 2 of 20

CONTENTS

1. GENERAL DESCRIPTION

2. TECHNICAL DATA

3. INSTALLATION

4. FRONT AND BACK PANEL

5. WELDING

6. ROUTINE MAINTENANCE

7. TROUBLESHOOTING

8. WIRING DIAGRAM

9. COMPONENTS AND SPARES

10. ACCESSORIES

11. SAFETY INSTRUCTIONS

DO NOT INSTALL, OPERATE OR REPAIR THIS EQUIPMENT WITHOUT

READING THIS MANUAL INCLUDING THE SAFETY INSTRUCTIONS

Revision date 11.02.2014
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1 GENERAL DESCRIPTION

UWI-150 TP is a compact and portable single phase inverter power source for professional MMA,
TIG and TIG-pulse welding.

It connects to a standard 230V one phase socket, preferably with 16A slow fuses to allow full power.
The TP (total protection) function protects against too high input voltage and will close down the

machine completely to prevent damage if input voltage exceeds 285V. A led on the rear panel will be
lit to indicate that the protection is on. When the input voltage is reduced welding power will
automatically be restored.

Safe in use. The automatic Voltage Reducing Function provides operator safety by reducing
“touchable” voltage for the operator to max. 9V between electrode holder and work-piece.

Line voltage compensation keeps output of the power source constant regardless of fluctuation in
input power from 15% below to 15% above rated input voltage.

Automatic Hot Start for stick arc starts makes arc striking easy and prevents electrode sticking.
Automatic Arc Force for stick electrode welding provides optimal arc characteristics for MMA (stick)

welding.
Lift-Start in TIG mode provides easy and soft TIG arc starting, and both normal and pulsed TIG

current enables optimal current also for sheet metal.
Step-less adjustment of welding current through whole current range: 5–150A, and remote control

that can be attached to the TIG torch provides excellent control through the welding process.
Casing of high grade aluminium and industrial plastic to eliminate corrosion damage also contributes

to low-weight which together with compact outer dimensions provides good portability.
Wind tunnel design for the internal cooling air flow protects electrical components and PC boards

from dirt, dust, debris, greatly improving reliability.
Thermal overload protection with indicator lights helps prevent machine damage if the duty cycle is

exceeded or airflow is blocked.
Total Protection function with indicator light prevents machine damage if excess voltage peaks in the

IDENTIFY COMPONENTS
Unitor Welding Inverter UWI 150 TP,

product number 191- 150150
is delivered with

1

Carrying strap and handle
mounted on the machine

1 pce

2

2,5 m primary cable with plug,
mounted on the machine.

1 pce

3

3 m welding cable with quick
connector and electrode holder

1 pce

4

3 m return cable with quick
connector and clamp

1 pce

5

Instruction Manual

1 pce

6

Carrying case

1pce

1

2

3 4 5

6

Revision date 11.02.2014
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2 TECHNICAL DATA

Type of welding machine

Processes

Safety Marking

Suitable for use in areas with increased electric shock hazard

X: Duty cycle

Duty Cycle is percentage of 10 minutes that unit can weld at rated load without overheating.
It refers to a 40°C environmental temperature. If unit overheats a thermal switch stops the output, the
warning light for over-temperature is lit and the cooling fan continues to run. Wait fifteen minutes for
unit to cool. Reduce amperage or duty cycle before starting to weld.

The unique serial number for the
machine will be printed here.
Always give serial number when
ordering spares or in other
communication with WSS
concerning your machine.

One-phase static transformer
rectifier

MMA (Stick
electrode /
SMAW)

TIG
(GTAW)

Pulsed TIG, pulse frequency 100Hz

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I2 = Welding current.
Range 5 – 150A

Ur = Reduced open circuit voltage

Is the voltage (excluded any stabilization voltage or arc ignition) found between the output outlets
when the welding machine is not welding. This is the voltage a welder can be exposed to between
electrode holder and work piece.

U2 = Arc voltage

Voltage present between the output outlets when welding is being carried out, in relation to a
particular set current. The relation, for the various welding modes is the following:

MMA→ U2=(20+0,04*I2)
TIG → U2=(10+0,04*I2)

Primary connection

U1 = Effective input voltage 230V
I1max = Maximum value of input current at the corresponding duty cycle.
I1eff = Effective value of input current at the corresponding duty cycle.

Cooling

COOLING AF= Forced air cooling (with a fan).

Protection class

IP23S= Ingress Protection class. Protection degree of the casing according to EN 60529
2: Protection against object not greater than 80mm in length and 12mm in diameter
3: Protection from sprayed water at an angle of 60º from vertical
S: Valid at standstill. (Should not be used for welding outdoors in heavy wind and rain)

Thermal insulation class

I.CL.H= Thermal class of the insulating materials and insulation systems.
resistant up to 180°C.

Standards

EN 60974-10 European Norm for electromagnetic compatibility.
EN 60974-1 European Norm for arc welding appliance: Current sources for welding.
Mark stating conformity to all safety standards and other standards required for sale

within the European Union

Dimensions and weight

Height : 215mm
Length : 310mm
Width : 120mm
Weight : 4,4kg

H H

L

W

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3 INSTALLATION

Only qualified personnel should perform this installation.
Only personnel that have read and understood this Manual should install and operate this
equipment.
Machine must only be plugged into a receptacle which is grounded in accordance with valid
regulations.

Note

The power switch should be in the OFF position when installing work cable and electrode cable and
when connecting power cord to input power.

Select a suitable location

The UWI 150 TP inverter welder has an IP23S rating. Locate the welder in a dry location where there
is free circulation of clean air into the louvers in the back and out the front of the unit.

Ensure minimum 50cm free space on all sides. If free flow of air is hindered the machine will
overheat.

A location that minimizes the amount of smoke and dirt drawn into the louvers reduces the chance of
dirt accumulation that can block air passages and cause overheating.

Avoid tilting

The machine must be placed on a secure, level surface, maximum 15º out of horizontal.

Assembly

Select polarity to electrode based on recommendations on the electrode package and the job at
hand. For TIG welding negative (-) polarity should always be to the torch, and remote control
attached to the torch and connected to the machine. (centre contact above)

Welding cable and

electrode holder

Return cable and

ground clamp

Negative pole

Positive pole

Remote control connection

1 phase 230V

50/60 Hz + PE

(16 A slow fuses

recommended)