Full Product Manual
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REAR PANEL LIGHTNING MTS 275
Section 2 Setup Guide
REAR PANEL FEATURES
1. Gas Supply. The Lightning MTS series unit is equipped with dual gas inlets. The top should be connected to pure Argon for
TIG. The bottom should be connected to the appropriate MIG gas. This is a standad 5/8 CGA inert gas female tting. The
unit is supplied with one regulator, but the two inlet setup allows for installation of 2 regulators at the same time. One is for
MIG, and the other for TIG. If using only one regulator, keep one of the supplied plastic caps installed to prevent dirt entry
into the solenoids. Upon installation of the regulator, check for leaks in the regulator tubing. If a leak is found, install extra
clamp if needed to prevent gas from escaping.
2. Power Switch. Turns unit on or off. This is a 2 pole single phase 240V breaker-type switch. If it is switched to the left, this
means the unit is switched off. If it is switched to the left, and the unit is plugged into a good power supply, the unit should
power up. Note: When switched off, the unit will continue to run and appear to be switched on for up to 10 seconds as the
capacitors discharge. This is normal. However, If the unit will not switch off for some reason, the switch may be damaged.
Turn off the unit at the main circuit breaker, and contact Everlast technical. Do not continue to use.
3. Power Input Cable and NEMA 6-50P Plug. The Lightning MTS unit requires 120/240 V single phase 50/60 Hz power input. If
necessary this unit will operate on 208V input as it is within the 10% voltage allowance. If actual voltage is below 205 volts,
the unit may not function correctly. If used on a generator, the generator must labeled as “clean power” and provide less
than 5% THD. Consult your generator manufacturer for information regarding the clean power rating on specic units. Ever-
last does not provide a list of approved generators. Manufacturers rate their units as clean power independently according to
industry standards. The plug is the NEMA 6-50P. This is the standard plug for welders operating on 240V in the US and
Canada. Other countries will have different congurations. For operation with 120V, use the supplied adapter.
4. Fuse. 10A, Fast-blow. F10AL, 250V. This controls the main power to the panel and fans. If the unit suddenly stops, and no
power to the panel is observed and the fans are not running, rst check the main circuit breaker at the power panel and the
power switch position on the back. Reset if necessary. If power isn’t restored check this fuse. It’s a standard fast blow glass
type fuse available at many auto parts and electronic supply stores. Fuses can blow from overloading, circuit defect or simply
from operation over time. If the wire feeder quits feeding, and all other signs are correct, it may be another fuse issue.
5. Fans. The unit is equipped with a 4 fan system, which offers quieter and more efcient cooling. It must operate free of ob-
struction to preserve the high duty cycle which it offers. Keep all objects or restrictions at least 12” from all sides of if the unit
for proper cooling. If possible allow 18”. Allow the unit to rest on the rubber pads/feet mounted on the welder. Do not have
the bottom of the unit supported directly on the metal pan so air can circulate around the bottom as well. Do not run in an
enclosed space such as a cabinet or work box. Do not grind or weld where sparks are directed toward the rear of the unit or
metallic particles will build up on the fan blades and also on interior components. If metal builds up on the fan blades, it can
cause the them to vibrate and ultimately fail.
6. Ground Bolt. The unit is equipped with an additional grounding point for applications requiring a bonded ground. Under
most conditions, the use of the ground is not required. Consult a local licensed electrician for installation and use of this
connection.
7. Water-Cooler Plug. (NA on early models) This is a 240V cooler plug designed for use with Everlast Water Coolers. Do not
use this plug for any other application. This is a low amperage outlet and is not designed to power any tools or other acces-
sories. The Power-Cool 400 water cooler is recommended for this unit. It is designed to stack under the Lighting MTS 275.