MILLER MAXSTAR 150 STL (01) PDF Document

When operating the MILLER MAXSTAR 150 STL, you must follow several critical safety precautions to protect yourself and others from injury.

Electric Shock Prevention:

• Do not touch live electrical parts. The electrode, work circuit, input power circuit, and internal circuits are live when the unit is on.

• Wear dry, hole-free insulating gloves and body protection.

• Insulate yourself from the workpiece and ground using dry insulating mats or covers.

• Disconnect input power before installing or servicing the equipment.

• Properly install and ground the equipment according to the owner’s manual and all applicable codes.

• Do not use worn, damaged, undersized, or poorly spliced cables.

Protection from Fumes and Gases:

• Keep your head out of the fumes. Do not breathe fumes.

• Use proper ventilation, such as local forced ventilation at the arc, to remove welding fumes and gases.

• If ventilation is poor, wear an approved air-supplied respirator.

• Do not weld in locations near degreasing, cleaning, or spraying operations.

Protection from Arc Rays:

• Wear an approved welding helmet with the correct shade of filter lens to protect your face and eyes.

• Wear approved safety glasses with side shields under your helmet.

• Use protective screens or barriers to protect others from flash and glare.

• Wear protective clothing made from durable, flame-resistant material (leather, heavy cotton, or wool).

Fire and Explosion Prevention:

• Remove all flammable materials within 35 ft (10.7 m) of the welding arc.

• Do not weld on closed containers like tanks or drums unless they are properly prepared.

• Watch for fire and keep a fire extinguisher nearby.

• Connect the work cable as close to the welding area as practical.

Cylinder Safety:

• Protect compressed gas cylinders from excessive heat, shocks, slag, and flames.

• Keep cylinders upright and secured.

• Never allow a welding electrode to touch any cylinder.

General Safety:

• Keep all panels and covers securely in place.

• Only qualified persons should install, operate, maintain, and repair the unit.

• During operation, keep everybody, especially children, away.

The technical specifications are as follows:

*Sense Voltage For Stick And TIG Lift Arc™

Duty cycle is the percentage of a 10-minute period that the MILLER MAXSTAR 150 STL can weld at its rated load without overheating. For example, a 30% duty cycle means the unit can weld for 3 minutes out of 10 and must cool for the remaining 7 minutes.

If the unit overheats:

1. The welding output will stop.

2. The High Temperature Light (LED) on the front panel will turn on.

3. The cooling fan will continue to run to cool the internal components.

You must wait for the unit to cool down, which typically takes about fifteen minutes. Once cool, the light will turn off, and you can resume welding. To prevent overheating, you can reduce the amperage or reduce the duty cycle (weld for shorter periods). Exceeding the duty cycle can damage the unit and void the warranty.

1. Ready Light (LED): This light comes on about two seconds after the power switch is turned On, indicating the unit is energized and ready to weld. A flashing light indicates a functional error or that the unit is not ready.

2. High Temperature Light (LED): This light comes on if the unit overheats. Once the unit has cooled, welding can resume. If this light flashes, the unit requires service from an Authorized Service Agent.

3. Amperage Adjustment Control: This large dial adjusts the welding amperage.

4. Process Select Switch: Allows selection of the desired welding process (details vary by model).

5. Positive Weld Output Receptacle: For Stick welding, connect the electrode cable here. For TIG welding, connect the work cable here.

6. Negative Weld Output Receptacle: For Stick welding, connect the work cable here. For TIG welding, connect the torch cable here.

7. Remote Receptacle (STL and STH models only): Allows a remote control to adjust the output from minimum to the maximum setting on the front panel.

8. Power Switch: Turns the unit On (I) or Off (O).

9. Gas Fitting: Connection point for the shielding gas hose from the regulator/flowmeter.

Use the Process Selector Switch Pad to cycle through the available welding processes. Press the switch pad until the LED for the desired process is illuminated.

The available processes are:

1. Lift-Arc™ Start: A TIG arc starting method where the electrode must briefly touch the workpiece to initiate an arc. This is ideal for applications where high frequency (HF) is not allowed.

2. Stick (SMAW): Select this for stick welding. This mode energizes the Adaptive Hot Start and DIG circuitry for better arc starts and control.

3. Lift-Arc™ Start (Remote): This is the same TIG starting method as above, but it requires a remote contactor closure (e.g., from a foot pedal or finger-tip control) to initiate the arc after touching the workpiece.

The Lift-Arc™ start procedure is a method to begin a TIG weld without using high frequency.

1. Select either the Lift-Arc or Lift-Arc (Remote) process on the front panel.

2. Gently touch the tungsten electrode to the workpiece at the desired start point of the weld.

3. Hold the electrode on the workpiece for 1 to 2 seconds.

4. Slowly lift the electrode off the workpiece. As you lift, the welding arc will form.

Important: Do not strike the electrode against the workpiece like a match, as this can contaminate the tungsten and the weld.

These recommendations are for a dedicated branch circuit sized for the rated output and duty cycle of the welding power source.

Always use the shortest cord possible. The following table provides the maximum allowable cord length for different conductor sizes to ensure less than a 3% voltage drop.

The MILLER MAXSTAR 150 STL features Auto-Line circuitry, which automatically adapts to the input voltage (115 or 230 VAC). Do not cut off the power cord connector to rewire it.

For 115 VAC Power (using NEMA 5-15P plug):

1. Ensure you have a 15 or 20 ampere individual branch circuit protected by a time-delay fuse or circuit breaker.

2. Select the NEMA 5-15P plug and install it onto the power cord adapter, ensuring the threaded collar is tight.

3. Connect the plug to a standard NEMA 5-15R receptacle.

For 230 VAC Power (using NEMA 6-50P plug):

1. Refer to the electrical service guide for proper circuit protection.

2. Select the NEMA 6-50P plug and install it onto the power cord adapter, ensuring the threaded collar is tight.

3. Connect the plug to a standard NEMA 6-50R receptacle.

For Hardwired 230 VAC Power:

Installation must be done by a qualified person and meet all national and local codes.

1. Disconnect and lockout/tagout the input power source.

2. Connect the green or green/yellow grounding conductor from the power cord to the disconnect device grounding terminal first.

3. Connect the two input conductors (L1 and L2) to the disconnect device line terminals.

4. Close and secure the door on the disconnect device before restoring power.

Disconnect power before performing any maintenance. For severe conditions, maintain more often.