Unitor UWI 150 TP - User Manual

Gary YoungJul 31, 2025

Why Unitor Welding System has no output and a yellow warning light?

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Theresa PattersonJul 31, 2025
The Unitor Welding System might show no output and a yellow warning light due to several reasons: * Voltage protection might be activated because the input voltage is too high (it should be below 285V AC). * Thermal protection could be activated if the system was used at too high a duty cycle. In this case, wait for the machine to cool down. You can weld with more breaks or at a lower current. * Cooling airflow may be obstructed; remove any obstructions. * Heat may be developing in loose electrode holder or ground cable connections. * The fan might be broken; repair or replace it. * There might be too much dirt in the power source compartment; clean it out.

Summary

GENERAL DESCRIPTION

IDENTIFY COMPONENTS

Lists all components included with the Unitor Welding Inverter UWI 150 TP.

TECHNICAL DATA

Technical Specifications Overview

Details technical specifications including EN standards, input/output voltage, current ratings, and cooling.

Welding Processes Supported

Identifies the welding processes the machine supports: MMA, TIG, and TIG pulse.

Duty Cycle Explanation

Explains the meaning of duty cycle and its impact on machine operation and overheating.

Technical Terminology Definitions

Defines terms like welding current (I2), reduced open circuit voltage (Ur), and arc voltage (U2).

Protection and Standards Information

Details protection class (IP23S), thermal insulation class (CL.H), and applicable standards.

Machine Dimensions and Weight

Provides the physical dimensions (height, length, width) and weight of the welding machine.

INSTALLATION

Installation Requirements and Location

Specifies requirements for qualified personnel, grounding, and selecting a suitable dry location with free air circulation.

Assembly and Connections

Guides on assembling the welder, connecting welding/return cables, and power cord safely.

Polarity Selection for Welding

Advises on selecting polarity based on electrode recommendations and job requirements, especially for TIG.

FRONT AND BACK PANEL

Front Panel Controls and Indicators

Details the function of power warning, thermal protection, process selection, current adjustment, and VRD signal.

Back Panel Switch and Cable

Identifies the On/Off switch on the back panel and the primary cable.

Total Protection Warning Light

Explains the warning light for the Total Protection function indicating over-voltage.

WELDING

MMA (Stick) Welding Procedure

Provides instructions for MMA welding, including polarity, amperage, and arc striking techniques.

TIG and TIG Pulse Welding

Explains TIG and TIG pulse welding, including torch connection, polarity, and arc starting.

Hot Start and Arc Force Features

Describes the automatic Hot Start and Arc Force features for easier arc striking and better performance.

ROUTINE MAINTENANCE

Maintenance Checkpoints and Intervals

Lists checkpoints like plugs, cables, labels, and sockets with recommended actions and intervals.

TROUBLESHOOTING

Troubleshooting Common Issues

Provides solutions for common problems like no output, yellow warning light, and unstable arc.

WIRING DIAGRAM

Electrical Wiring Schematic

Presents the detailed electrical wiring diagram for the Unitor Welding Inverter UWI 150 TP.

COMPONENTS AND SPARES

Component Identification Diagram

Illustrates the various components and parts of the welding machine with numerical labels.

Component List and Part Codes

Provides a detailed list of all components with their corresponding codes for ordering spares.

Ordering Spare Parts Information

Information required for ordering spare parts, including model, serial number, and part code.

ACCESSORIES

Stick Welding Accessories

Lists available accessories for Stick (MMA) welding, including face shields, gloves, and electrode holders.

TIG Welding Accessories

Lists available accessories for TIG welding, such as gloves, torches, and regulators.

SAFETY INSTRUCTIONS

Electric Shock Hazards and Prevention

Details the severe risks of electric shock and precautions like using dry gloves and proper grounding.

Safe Handling and Servicing Procedures

Covers safe practices for installation, servicing, cable management, and handling internal components.

Health Hazards: Fumes, Gases, and Arc Rays

Warns about hazardous fumes, gases, arc rays, and necessary protective measures.

Fire and Explosion Risks During Welding

Addresses fire and explosion risks from sparks, hot parts, and welding on closed containers.

Flying Metal and Gas Hazards

Covers hazards from flying metal and the risks associated with gas buildup.

Burn, Pacemaker, and Noise Hazards

Covers risks from hot parts, magnetic fields affecting pacemakers, and noise exposure.

Cylinder Safety and General Precautions

Details safety regarding gas cylinders, installation, unit handling, overuse, static discharge, and moving parts.

High-Frequency (HF) and Arc Welding Interference

Addresses potential interference from HF radiation and arc welding with electronic equipment.

Electromagnetic Field (EMF) Information

Discusses EMF effects, research findings, and procedures to minimize exposure to magnetic fields.

DECLARATION OF CONFORMITY

CE Conformity and Standards

States the machine's compliance with EU directives and applicable standards like EN 60974.

Unitor UWI 150 TP Specifications

General

Brand	Unitor
Model	UWI 150 TP
Category	Welding System
Language	English