OTC Welbee M350L II User Manual (English)

Questions and Answers:

R
Raymond AllenAug 18, 2025
What to do if my OTC Welbee M350L II shows error E-300 to 303?
- B
  Brandon HarrellAug 18, 2025
  If the OTC Welding System displays error code E-300 to E-303, it indicates that the temperature inside the welding power source has exceeded the allowable range. Leave the power on to allow the cooling fan to operate for at least 10 minutes, then turn the power off. After that, clean any dust inside the welding power source. After the temperature issue is resolved and the power is turned off, the error code will disappear. After recovery, be careful not to exceed the rated duty cycle.
E
Eric CaldwellAug 20, 2025
What to do if my OTC Welding System displays error E-150?
- J
  James WhitakerAug 20, 2025
  If the OTC Welding System shows error code E-150, it means the input voltage for the primary side is outside the allowable range. Make sure the input voltage is within 208/230/460 V ±10%. The error code will disappear when the power switch is turned off.
M
Melvin BennettAug 23, 2025
Why does my OTC Welding System show error E-160?
- M
  Mariah MckenzieAug 23, 2025
  If the OTC Welding System displays error code E-160, it means the input voltage for the primary side has fallen below the allowable range. Check that the input voltage for primary side is in the range of 208/230/460 V ±10%. Also, verify the setting of internal function F20. The error code will disappear when the power switch is turned off.
K
kevinmcgeeAug 25, 2025
What to do if my OTC Welbee M350L II displays error E-155?
- M
  milesdianeAug 26, 2025
  If the OTC Welding System shows error code E-155, it indicates that the input voltage for the primary side is outside the allowable range of 265 to 320 V. Verify that the input voltage is within the range of 208/230/460 V ±10%. The error code will disappear when the power switch is turned off.
J
Jessica YoungAug 27, 2025
What causes error E-800 or E-801 on my OTC Welbee M350L II Welding System?
- T
  Tina ScottAug 27, 2025
  If the OTC Welding System displays error code E-800 or E-801, it indicates that the rotation rate of the wire feeder motor was not detected. Check the cables connecting the wire feeder for any disconnections, short circuits, or other issues. Also, inspect the wire feeder itself for any problems. The error code will disappear when the power switch is turned off.
A
acarterAug 30, 2025
What does error E-010 mean on my OTC Welbee M350L II Welding System?
- K
  Kyle RodriguezAug 30, 2025
  If the OTC Welding System shows error code E-010, it means the torch switch was on when the power switch was turned on. Ensure the torch switch is not pressed. If internal functions F29 to F32 are set to "4" (activate), check the connections of the terminal blocks for external connection. The error code will disappear once this issue is resolved.
A
alicia79Sep 1, 2025
What does error E-210 mean on my OTC Welbee M350L II?
- R
  roger21Sep 1, 2025
  If the OTC Welding System displays error code E-210, it indicates that the arc voltage was not detected. Check that the power cables (base metal side and torch side) and the voltage detection cable are properly connected. The error code will disappear when the power switch is turned off.
M
Marilyn SmithSep 3, 2025
What to do if my OTC Welding System displays error codes E-030 to 037?
- Q
  qadamsSep 3, 2025
  If the OTC Welding System displays error codes E-030 to 037, this means that installing the software from a USB flash drive has failed. Verify that the USB flash drive is working correctly, properly connected to the USB connector, and then try the installation again. The error code will disappear when the power switch is turned off.
M
Matthew MillerSep 6, 2025
What does error E-020 mean on my OTC Welbee M350L II Welding System?
- K
  Kerry MillerSep 6, 2025
  If the OTC Welding System displays error code E-020, it indicates that inching was active when the power switch was turned on. Make sure the WIRE INCH key (or inching button) is not pressed. If internal functions F29 to F32 are set to "2" (inching), check the connections of the terminal blocks for external connection. The error code will disappear once the issue is resolved.
L
Larry SandersSep 8, 2025
What does error E-710 mean on my OTC Welding System?
- R
  rubioamandaSep 8, 2025
  If the OTC Welding System displays error code E-710, it indicates that phase W of the input voltage for the primary side is not connected. Check the input voltage for the primary side and the cable wiring for any issues. The error code will disappear when the power switch is turned off.

OTC Welbee M350L II Specifications

General

Rated Input Capacity	14.3 kVA
Rated Output Current	350 A
Rated Output Voltage	31.5 V
Output Current Range	30 - 350 A
Duty Cycle	60%
Protection Class	IP21S
Insulation Class	H
Cooling Method	Forced Air Cooling
Welding Current Range	30 - 350 A
Duty Cycle at 350A	60%
Wire Diameter Range	0.8 - 1.6 mm
Welding Method	MIG/MAG
Rated Input Voltage	3-phase AC 380V/400V/415V 50/60Hz
Input Voltage	3-phase AC 380V/400V/415V 50/60Hz

Summary

Important Information

Use of the Product

Specifies the intended purpose and limitations of the welding power supply.

Safe Use of the Product

Outlines essential instructions for safe operation and maintenance.

Export and Disposal Guidelines

Covers regulations for exporting and proper disposal of the welding equipment.

CHAPTER 1 SAFETY INFORMATION

1.1 Warning Symbols

Explains the meaning and usage of safety warning symbols in the manual.

1.2 Safety Precautions

Details crucial safety measures for operating the welding power source.

1.2.1 Operating precautions

General safety guidelines for operating the welding power source.

1.2.2 Precautions for power supply and electric shock

Safety measures to prevent electric shock and related hazards.

1.2.3 Precautions for handling of plastic parts

Guidelines for safely handling plastic components to prevent damage or injury.

1.2.4 Precautions for disassembling and modifying the welding power source

Warnings against unauthorized disassembly and modification of the welding unit.

1.2.5 Precautions for air discharge and use of respiratory protective equipment

Safety protocols for ventilation and respiratory protection during welding.

1.2.6 Precaution for protective equipment

Recommendations for appropriate personal protective equipment (PPE) for welding.

1.2.7 Precautions for flammable materials

Safety measures to prevent fire and explosion hazards from flammable materials.

1.2.8 Precautions for gas cylinder and gas regulator

Safety guidelines for handling gas cylinders and regulators.

1.2.9 Precautions for rotating part

Warnings to avoid entanglement with moving parts of the welding equipment.

1.3 Principal Safety Standards

Lists relevant safety standards and codes for welding operations.

CHAPTER 2 PRODUCT SPECIFICATION AND CONFIGURATION

2.1 Specification

Details the technical specifications and external dimensions of the welding power source.

2.1.1 Specifications

Lists the detailed technical parameters and ratings of the welding power source.

2.1.2 Applicable welding method

Details the compatible welding methods, gases, wire types, and diameters.

2.1.3 External dimensions

Provides the physical dimensions (width, depth, height) of the welding power source.

2.1.4 Rated duty cycle

Explains the duty cycle specifications for continuous operation at rated current.

2.2 Product Configuration

Outlines the standard and optional components of the welding power source system.

2.2.1 Standard composition

Lists the standard parts included with the welding power source for basic setup.

2.2.2 Accessory (supplied)

Identifies the accessories provided with the welding power source package.

2.2.3 Accessory (not supplied)

Lists accessories that the customer needs to prepare separately for operation.

2.2.4 Optional accessories

Details optional accessories available for enhanced functionality or specific applications.

2.3 Part Names

Identifies and labels the components on the front and rear panels of the welding power source.

2.3.1 Front panel

Identifies components located on the front panel of the welding power source.

2.3.2 Rear panel

Identifies components located on the rear panel of the welding power source.

CHAPTER 3 TRANSPORTATION AND INSTALLATION

3.1 Required Equipment

Lists essential equipment and protective devices needed for installation.

3.1.1 Welding power source equipment

Specifies the required electrical supply voltage and capacity for the welding power source.

3.2 Installation Environment

Specifies the recommended environmental conditions for installing the welding power source.

3.2.1 Installation environment

Lists the environmental factors to consider for proper installation.

3.2.2 Electromagnetic interference

Advises on mitigating electromagnetic interference issues during installation.

3.3 Transportation Procedure

Details the safe methods for transporting the welding power source.

3.3.1 Transportation with lifting lug

Explains the procedure for safely lifting and moving the unit using lifting lugs.

3.3.2 Manual transportation with carts

Details the process for manually transporting the unit using carts or other equipment.

CHAPTER 4 CONNECTION

4.1 Precautions for Connection Procedure and Grounding

Outlines essential safety precautions for connecting and grounding the welding power source.

4.2 Connecting the Welding Power Source

Provides a step-by-step guide for connecting the welding power source to various components.

4.2.1 Connection of cable at output side

Explains how to connect output cables to the base metal and torch.

4.2.2 Connection of wire feeder

Details the procedure for connecting the wire feeder to the welding power source.

4.2.3 Connection of welding torch

Guides on connecting the welding torch, including water-cooled options.

4.2.4 Connection of voltage detection cable (Voltage detection cable is used)

Explains how to connect the voltage detection cable for accurate arc voltage feedback.

4.2.5 Connection at TIG welding

Provides specific connection instructions for TIG welding operations.

4.2.6 Connection at DC STICK welding

Details the connection procedure for DC STICK welding mode.

4.2.7 Connection of shield gas

Explains how to connect the shield gas supply system for welding.

4.3 Grounding and Connection of Input Power Supply

Explains the procedures for grounding and connecting the input power supply.

4.4 Confirmation of Connection

Details the steps to verify that all connections have been made correctly.

4.5 Connection of External Equipment

Describes how to connect external equipment like robots or automatic machines.

4.5.1 Connection of robot

Illustrates connecting the welding power source to robotic systems for automation.

4.5.2 Connection of automatic machine

Details connecting the power source to automatic welding machines via terminal blocks.

CHAPTER 5 WELDING OPERATION

5.1 Precaution at Welding Operation

Outlines essential safety precautions to be observed during welding operations.

5.1.1 Precautions for air discharge and use of respiratory protective equipment

Safety measures for ventilation and respiratory protection during welding operations.

5.1.2 Precaution for protective equipment

Guidelines on wearing appropriate personal protective equipment for welding safety.

5.1.3 Precautions on welding place

Safety considerations for the welding environment, including wind and partitions.

5.2 Check before Welding

Lists crucial checks and parameter settings to perform before starting welding.

5.3 Power ON and Gas Supply

Explains the correct procedure for powering on the unit and supplying shield gas.

5.4 Wire Inching

Details the operation for feeding wire manually for setup and adjustment.

5.5 Check and Setting of Welding Condition

Covers checking current conditions and preventing erroneous panel operations.

5.5.1 Reading welding condition

How to view and confirm currently set welding parameters.

5.5.2 Preventing erroneous operation on operation panel

Explains how to activate and use the panel lock function.

5.6 Performing Welding Operation

Guides through the process of starting, conducting, and ending a welding operation.

5.6.1 Operation of welding start

Details the steps to initiate a welding operation.

5.6.2 Operation during welding

Explains how to adjust parameters while a welding operation is in progress.

5.6.3 Operation at welding end

Describes the procedure to safely conclude a welding operation.

CHAPTER 6 WELDING CONDITION

6.1 List of Welding Conditions

Provides a comprehensive list of settable welding parameters and their ranges.

6.1.1 Parameter (Welding parameter)

Details the various welding parameters and their adjustable ranges.

6.1.2 Function

Lists the available functions and their initial/setting parameters.

6.1.3 Internal function

Details internal functions that can be configured for specific operations.

6.2 Function on Operation Panel

Explains the layout and functions of the control panel keys and displays.

6.2.1 Operation panel

Identifies and describes each key and display element on the operation panel.

6.2.2 Setting screen

Explains the functions and navigation of the setting screens on the LCD panel.

6.3 Welding Conditions

Discusses basic welding conditions and useful operational functions.

6.3.1 Basic welding conditions

Covers fundamental conditions like material, gas, wire, current, and voltage.

6.3.2 Useful functions

Highlights beneficial functions such as memory, synergic adjustment, and penetration control.

6.4 Preparing Welding Conditions

Outlines the step-by-step process for setting up welding parameters.

6.5 Memory Function of Welding Conditions

Explains how to save, load, and manage welding condition data.

6.5.1 Memory registration of welding conditions

Details how to store current welding settings into memory (JOBs).

6.5.2 Read out of welding conditions

Guides on retrieving previously saved welding conditions from memory.

6.5.3 Deletion of memory registration

Explains how to delete stored welding conditions from memory.

6.6 Setting Welding Conditions

Guides on setting welding modes and parameters for different sequences.

6.6.1 Welding mode setting

Selects welding modes based on gas, wire material, and travel speed combinations.

6.6.2 Setting welding conditions

Guides on setting parameters via HOME screen and screen operation knob.

6.6.3 Setting welding parameter

Explains how to set parameters like gas time, current, and voltage per sequence.

6.6.4 Crater setting

Details crater treatment options and torch switch operations for end-of-weld control.

6.6.5 Arc spot time

Explains the function and adjustment of arc spot time for specific welding tasks.

6.6.6 Welding voltage adjustment

Describes how to adjust welding voltage using SYNERGIC or INDIVIDUAL modes.

6.6.7 Arc characteristics adjustment

Guides on adjusting arc characteristics (arc status) to soft or hard.

6.6.8 Penetration control adjustment

Explains how to use constant penetration to maintain consistent weld depth.

6.6.9 Welding guide

Allows automatic welding current adjustment based on weld joint and plate thickness.

6.7 Setting Internal Functions

Details how to customize various internal functions for specific operational needs.

6.7.1 Setting procedure

Explains the general steps for setting internal functions and their values.

6.7.2 Detailed information on internal functions

Provides in-depth explanations for specific internal functions (F1-F89).

6.7.2.1 F1: Standard/Extended cable mode

Configures settings for extended cable use to reduce spatter.

6.7.2.2 F2: Switching functions with remote control

Assigns functions to the analog remote control's switching knob.

6.7.2.3 F4: Auto/Semi-auto mode

Sets I/O interface modes for robots or automatic machines.

6.7.2.33 F48: Adjusting current with torch switch

Allows adjusting welding current via torch switch operations.

6.7.2.37 F52: Data type of data log function

Selects data to be saved for the data log function.

6.7.2.39 F54 Tack start process

Enables fast tack welding by skipping wire slowdown.

6.7.2.41 F67: Setting change of current value (initial condition, crater condition)

Sets initial and crater current values as percentages.

6.7.2.49 F78: Prevention of unintended torch switch operation

Prevents accidental arc starts by detecting inactivity after pre-flow.

6.7.2.52 F81: TIG Mode torch switch setting

Enables torch switch control for TIG welding start/end.

6.7.2.53 F83: Arc length adjustment right after starting

Adjusts arc length immediately after welding initiation.

6.8 Operation of Analog Remote Control (Optional)

Explains the functions and operation of the optional analog remote control.

CHAPTER 7 ADMINISTRATOR FUNCTIONS

7.1 Protection of Welding Conditions

Explains the password protection and erroneous operation prevention functions.

7.1.1 Setting/Changing password

Details the procedure for setting or modifying the system password.

7.1.2 Disabling erroneous operation prevention

Guides on how to disable the password-protected erroneous operation prevention.

7.2 Welding Result Control Function

Details functions for managing and monitoring welding results.

7.2.1 Setting welding result control function

How to configure the parameters for monitoring welding results.

7.2.2 Details of welding control items

Explains specific control items like welding points, wire consumption, and time.

7.2.2.1 Number of welding point

Controls and counts the number of welding points based on set targets.

7.2.2.2 Wire consumption

Monitors and controls the total wire consumption used during welding.

7.2.2.3 Total welding time

Tracks and controls the cumulative welding time based on specified targets.

7.2.2.4 Welding monitor

Monitors average current/voltage and triggers alarms for deviations.

7.3 Data Backup (Utilization of data)

Explains how to back up and import welding data via USB.

7.3.1 Setting of welding conditions/internal functions

Details how to store welding conditions and internal function settings.

7.3.2 Simplified data log function

Explains sampling and backing up welding data for analysis.

7.3.3 Failure log function

Describes how the system records and stores error codes.

7.3.4 Welding Result Control Function

Explains saving machine identification and cumulative control values.

7.3.5 Backup operation

Guides on backing up data to a USB flash drive.

7.3.6 Importing backup data

Explains the process of importing backed-up data into the welding power source.

7.4 Initializing Welding Conditions and Internal Functions

Guides on resetting welding conditions and internal functions to default settings.

7.5 Checking the Software Version and Serial Number

Explains how to check the installed software version and product serial number.

7.6 Calibration Mode

Details the process for calibrating current and voltage readings.

7.6.1 Adjustment of output current

Provides steps for calibrating the output current measurement.

7.6.2 Adjustment of output voltage

Provides steps for calibrating the output voltage measurement.

7.7 System Setting

Allows adjustment of font size, LCD background, and language settings.

CHAPTER 8 MAINTENANCE AND INSPECTION

8.1 Precautions for Maintenance and Inspection

Outlines critical safety measures before performing maintenance or inspection.

8.2 Daily Inspection

Details the routine daily checks for the welding power source.

8.3 Periodical Inspection

Describes the schedule and items for periodic maintenance checks.

8.4 Periodical Replacement Parts

Lists components recommended for periodic replacement to ensure longevity.

8.5 Insulation Resistance Measurement and Withstand Voltage Test

Explains specialized electrical tests for safety and performance.

CHAPTER 9 TROUBLESHOOTING

9.1 Action in Case of Error

Provides guidance on identifying and resolving error codes displayed by the system.

9.2 Troubleshooting

Addresses common problems and their corrective actions, excluding error codes.

CHAPTER 10 REFERENCE MATERIALS

10.1 Parts List

Lists all parts of the welding power source with their part numbers and specifications.

10.2 Reference Drawing

Includes schematic diagrams and parts layout drawings for technical reference.

10.2.1 Schematic diagram

Presents the detailed electrical schematic diagrams of the welding power source.

10.2.2 Parts layout drawing

Illustrates the physical placement of components within the welding power source.

10.3 Materials for Setting Welding Conditions

Provides reference data and examples for setting welding parameters.

10.3.1 Guide for changing welding conditions

Offers tips and guidance on adjusting welding parameters for optimal results.

10.3.2 Samples of welding condition settings

Provides example settings for various welding scenarios and materials.

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