4-2. POLARITY SWITCH (Figure 4-1)

POLARITY SWITCH

LECTRODE ( )

(+) ELECTRODE

NEGATIVE

POSTIVE

DO NOT SWITCH

WHILE WELDING

CAUTION: ARCING can damage switch contacts.

•Do not change POLARITY SWITCH position while welding or under load.

The POLARITY switch provides a means of selecting ei- ther electrode negative or electrode positive weld output polarity without having to change the output cable con- nections.

Placing the POLARITY switch in the ELECTRODE NEGATIVE position causes the ELECTRODE output terminal to be negative and the WORK output terminal to be positive. Conversely, if the POLARITY switch is placed in the ELECTRODE POSITIVE position, the ELECTRODE output terminal is positive and WORK output terminal is negative.

4-3. GAS/COOLANT SWITCH (Figure 4-1)

GAS/COOLANT ON

/

OFF

The function of the GAS/COOLANT switch is to govern the operation of the gas and water solenoids and the POSTFLOW timer. When this switch is in the OFF posi- tion, the gas and coolant valves and POSTFLOW timer are disabled (out of the circuit). When this switch is in the ON position, the gas and coolant valves and POST- FLOW timer are energized (in the circuit). The ON posi- tion of this switch is normally used for Gas Tungsten Arc Welding applications; the OFF position is used for Shielded Metal Arc Welding applications.

4-4. GAS/COOLANT POSTFLOW CONTROL (Figure 4-1)

POSTFLOW

t 2

IMPORTANT: The POSTFLOW timer is disabled whenever the GAS/COOLANT switch is in the OFF po- sition.

An adjustable 0 to 60 seconds gas-coolant POSTFLOW time control is provided for controlling the period of time shielding gas and coolant are allowed to flow after the arc is extinguished. The POSTFLOW time control gov- erns the operation of a postflow timer within the TIG- Unit.

Rotating the control in a clockwise direction increases the postflow time. The scale surrounding the POST- FLOW time control is calibrated in seconds to aid in the selection of a postflow time period suited to the individu- al welding operation.

As soon as the contactor is deenergized, the postflow timer begins to time out the selected period of postflow time. Once the timer has timed out, the gas and coolant valves close and thereby cut off shielding gas and cool- ant flow. The timer automatically resets and is ready for another weld cycle.

4-5. REMOTE HAND CONTROLS

WARNING: ELECTRIC SHOCK can kill; UN-

EXPECTED HIGH FREQUENCY DURING PREFLOW can cause serious injury and equipment damage.

•Do not allow electroslope switch or other unit control switch to be maintained closed during preflow time.

•Always close and immediately open control switch to ensure that high frequency will not be present during preflow.

If the unit is equipped with the optional electro- slope and preflow timer, it is possible to have high frequency present during preflow without machine contactor energized.

A fingertip control (RCC-14) is supplied with every unit. This control is a maintained-contact type switch used for remote Amperage and Output (Contactor) control. The fingertip control must be connected to the REMOTE 14 receptacle (see Figure 4-1 and Section 3-10) under the front access door of the TIG-Unit to be functional. This control is designed to be strapped to the torch handle for convenient operation.

IMPORTANT: When employing the RCC-14 remote control, the AMPERAGE switch on the TIG-Unit must be in the REMOTE position for proper remote control operation.

Amomentary-contact type switch (RMLS-14) is addi- tionally supplied with each unit equipped with an Elec- troslope. This control must be connected to the RE- MOTE 14 receptacle (see Figure 4-1 and Section 3-10) under the front access door of the TIG-Unit to be func- tional. It is necessary to press this switch each time a new or different weld condition is desired. This switch al- lows the operator to manually control the selection of the welding conditions and duration of that condition. It fur- ther gives the operator the capability of moving rapidly from one condition to the next, if desired. It is necessary to press this switch four times to advance the unit through a complete weld cycle. Anytime that the arc is broken (except during the initial condition), the Electro- slope will automatically reset to Off. During the initial

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Miller Electric KC237900 manual GAS/COOLANT on OFF, Postflow, Remote Hand Controls
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KC237900 specifications

The Miller Electric KC237900 is a standout model in the realm of welding technology, specifically designed for versatility and efficiency. This machine embodies Miller's commitment to innovation and quality, making it a popular choice among professionals and hobbyists alike.

One of the main features of the KC237900 is its advanced inverter technology, which allows the unit to operate efficiently across a range of welding applications. This technology ensures that the welder maintains a stable arc for precision welding, even on thin materials. The inverter design also contributes to a lighter and more compact machine, enhancing portability without compromising on power.

The KC237900 supports multiple welding processes, including MIG, Flux-Cored, and Stick welding. This versatility makes it suitable for a variety of projects, from automotive repairs to intricate fabrication tasks. The machine’s ability to handle diverse materials, including steel, stainless steel, and aluminum, further expands its application scope.

Another characteristic of the Miller Electric KC237900 is its user-friendly interface. The digital display provides clear information on amperage and voltage settings, allowing welders to make quick adjustments as needed. Additionally, the intuitive control panel simplifies the operation, making it accessible to users with varying skill levels.

The arc technology integrated into the KC237900 contributes to its smooth and stable welding performance. The unit utilizes Miller's Auto-Set feature, which automatically adjusts parameters based on material thickness and type. This feature not only speeds up the setup process but also enhances the overall weld quality.

Durability is another key aspect of the KC237900. Built with robust materials, the machine is designed to withstand the rigors of job site conditions. Its protective features, such as thermal overload protection, ensure that the unit operates safely and efficiently.

In conclusion, the Miller Electric KC237900 is a high-performance welding machine that combines advanced inverter technology, versatility, and user-friendly features. With its ability to handle multiple welding processes and materials, along with its focus on reliability and ease of use, it stands out as an excellent choice for both experienced welders and newcomers to the trade. Whether for professional use or personal projects, the KC237900 delivers the performance and quality that Miller Electric is known for.
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