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User guide for Weldclass Promax 600, Promax 650, and Promax 680 welding helmets.
Before you start:
Make sure to read the instruction manual thoroughly. This online guide serves as an additional resource but does not replace the manual provided with the helmet. It's important to go through the manual before using your helmet.
To qualify for the full or extended warranty, please register within 30 days of purchasing your helmet.
Controls & Settings - Promax 600 and 650:
[Image description: Control panel for Promax 600 and 650]
Press MODE once to cycle through the different modes. Use the UP or DOWN buttons to adjust the shade level within each mode.
Please note that the following features apply to lenses with serial numbers beginning with "2022..." and "2023..."
Holding the MODE button will run a series of tests on the lens.
When in WELD mode, pressing FUNC allows you to scroll through various functions. Adjust these settings using the UP or DOWN buttons.
Gradient Function: Press and hold FUNC for 2 seconds to activate or deactivate the gradient function. A 'GRADIENT' message will appear in the top right corner of the LCD screen when activated. After welding, the gradient function ensures the lens transitions smoothly from the darker welding shade back to lighter shades, simulating the cooling of the weld pool and reducing eye fatigue.
This feature was recently added to lenses with serial numbers starting with "2023..."
Quickly pressing UP/DOWN simultaneously will lock the lens to the current shade level, keeping it in the dark state and preventing it from switching to light. You can still adjust the shade while locked.
To unlock and revert to automatic settings, press UP/DOWN again.
This lock feature is particularly useful when dealing with light sources like oxy-cutting or brazing, or when environmental factors such as nearby conflicting lights or awkward welding positions might interfere with the normal auto-darkening function.
Up to 10 favorite settings can be saved.
The lens must be in WELD mode to access memory settings. Lenses with serial numbers starting with "2023..." also allow memory usage in CUT mode.
To save a memory setting, first configure all desired welding settings (shade, sensitivity, delay, etc.). Then hold MEMORY for 2 seconds. 'M/W' will appear on the LCD screen along with the memory slot number. Use UP or DOWN to select the desired slot and wait 5 seconds. 'M/W' will disappear once saved.
To recall a saved setting, press MEMORY once. 'M/R' will appear on the LCD screen along with the memory slot number. Scroll through slots 0-9 using UP or DOWN.
Controls & Settings - Promax 680:
[Image description: Control panel for Promax 680]
The following instructions apply to internal controls. External controls are detailed in the diagram above.
Press MODE once to toggle between modes. Use UP or DOWN to adjust the shade level within each mode.
Holding MODE runs a test sequence on the lens.
Manual Mode: Press SHADE, then use UP or DOWN to adjust shade levels.
Auto Mode: Press and hold SHADE to activate or deactivate auto mode. Sensitivity can be adjusted in increments of 0.1 up to ±2.0 using UP/DOWN buttons.
This adjusts the sensitivity of the arc sensors to best suit the welding task and surrounding environment. Low sensitivity helps prevent the lens from reacting to other nearby light sources. High sensitivity may be needed for low current welding or TIG welding.
Manual Mode: Press SENSI, then use UP/DOWN to adjust sensitivity.
Auto Mode: Press and hold SENSI to activate or deactivate auto mode.
This adjusts the time it takes for the lens to transition from dark to light after welding stops.
Manual Mode: Press DELAY, then use UP/DOWN to adjust.
Tack Mode: This is the shortest delay setting. In tack mode, the lens returns to shade 5 instead of shade 3 between welds, further reducing eye strain. Ideal for repetitive tack welding.
Auto Mode: Press and hold DELAY to activate or deactivate.
Press GRADIENT to activate or deactivate. When welding stops, the gradient function will transition gradually from dark to light instead of directly from the dark welding shade back to light (shade 3). This mirrors the cooling of the weld pool, reducing eye fatigue.
Quickly pressing UP/DOWN simultaneously locks the lens to the current shade level, keeping it dark and preventing it from switching to light. While locked, you can still adjust the shade using UP/DOWN.
To unlock and return to previous auto-darkening settings, press UP/DOWN again.
This lock feature is useful when dealing with light sources like oxy-cutting or brazing, or when environmental factors like nearby conflicting lights or awkward welding positions might interfere with normal auto-darkening function.
Up to 9 favorite settings can be saved.
The lens must be in WELD mode to access memory settings.
To save a memory setting, first configure all desired welding settings (shade, sensitivity, delay, etc.). Hold MEMORY for 2 seconds. 'M/W' will appear on the LCD screen along with the memory slot number. Use UP or DOWN to select the desired slot and wait 5 seconds. 'M/W' will disappear once saved.
To recall a saved setting, press MEMORY once. 'M/R' will appear on the LCD screen along with the memory slot number. Scroll through slots 0-9 using UP or DOWN.
Headgear Adjustments:
To adjust the proximity of the helmet to your face, use the quick-release sliding adjustments as shown below.
[Image description: Sliding adjustment mechanism]
Adjust the size of the headband (via rear knob) and upper straps as shown below.
Tip: If the upper straps are too tight or short, they will position the headband higher up and prevent it from gripping properly. Increase strap lengths to allow the headgear to sit lower on the head so the headband and sweatband can get a good grip.
[Image description: Headband adjustment]
Adjust the tilt stop angle of the helmet as shown below. This adjusts the height of the helmet when it’s in the flipped-down position. Loosening the adjacent external knob will make this easier.
[Image description: Tilt adjustment]
Replacing Cover Lenses:
To remove the lens, pull one side of the lens forward to unlatch it.
IMPORTANT: When fitting a new cover lens, ensure that it is firmly latched at all four corners. Failure to do so may result in spatter damage/marking to the electronic cassette, voiding the warranty.
[Image description: Lens removal]
Using the access point at the top of the cassette (you may need a small flat-bladed screwdriver or similar tool), pull the lens back until it bends and the corners of the lens are released.
To fit a new lens, bend and push the corners of the lens into place, starting with the top corners.
If magnification lens holder brackets are fitted, it will be easier to temporarily remove these before replacing the cover lens.
[Image description: Lens installation]
Installing Magnification Lenses:
Each helmet is supplied with 2 mag lens holder brackets. Clip these into the inside of the helmet as shown in the video below.
Standard 108x51mm magnification lenses can now be fitted to these brackets.
Brackets are easily removed/unclipped if required, when replacing the inner clear cover lens.
[Image description: Magnification lens installation]
Removing Auto-Darkening Cassette:
Refer to the video below. Note that the video depicts the Promax 650 model with an external grind button.
1. For Promax 650 models only: Remove the external grind button by unscrewing the button surround. Be careful not to pinch or damage the control cable during the following steps.
2. Remove the front cover lens.
3. Note the two locking tabs inside the helmet, above the top of the cassette/window.
4. Place one hand inside the helmet and push each tab downwards firmly with two fingers.
5. The cassette will unlatch at the top; push/lever the cassette forward to remove and slide it out of the shell.
6. Reverse the above process to replace.
[Video link: Removal of cassette]
Replacing Batteries:
Two CR2450 coin-style batteries are located at the bottom of the cassette. Battery holders are visible from inside the helmet, but they are held in place by safety screws*, which can only be accessed by removing the cassette from the shell.
[Image description: Battery replacement]
See the video below.
1. Remove the cassette as per the steps under #7 above.
2. Remove the battery safety screws* using a Phillips-head screwdriver.
3. Remove the battery holders.
4. Replace the batteries.
5. Reverse the above process to replace.
*Safety screws are required for compliance with Australian Button/Coin battery laws, intended to prevent children from swallowing batteries.
[Image description: Safety screws]
Spare Parts:
Click on the links below to view more details on each replacement part:
[Image description: Spare parts list]
Lens Kit 2 Outer + 1 Inner (WC-05351)
Outer Cover Lens - Per Each (WC-05352)
Inner Cover Lens for Promax 600/650 - Pack 5 (WC-05350)
Inner Cover Lens for Promax 680 - Pack 5 (WC-05357)
Magnification Lenses
Headgear Assembly (WC-05353)
Sweatbands - Pack 5 (WC-01630)
Batteries (CR2450) - Not sold by Weldclass, commonly available from any battery supplier
Troubleshooting Guide:
Click here to view the welding helmet troubleshooting guide.
This user guide provides comprehensive information about the features and maintenance of the Weldclass Promax 600, 650, and 680 welding helmets. Always refer to the instruction manual for specific details regarding your particular model. Proper handling and regular maintenance will ensure the longevity and optimal performance of your welding helmet.
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