4-17. PERCENTAGE DOWNSLOPE RATE CON- TROL (Electroslope Models Only) (Figure 4-1)

PERCENTAGE DOWNSLOPE RATE 0.25-20 SEC.

t

0.25-20s

The PERCENTAGE DOWNSLOPE RATE control is calibrated in percent and can be adjusted for a down- slope rate of approximately .25 (FAST) to 20 (SLOW) seconds. The settings of this control are comparable to the PERCENTAGE UPSLOPE RATE control and deter- mine the time rate at which weld amperage will de- crease to the setting of the PERCENTAGE FINAL AM- PERAGE control.

IMPORTANT: This control may be adjusted while welding.

4-18. PERCENTAGE FINAL AMPERAGE CONTROL (Electroslope Models Only) (Figure 4-1)

PERCENTAGE

FINAL

AMPERAGE

A

The PERCENTAGE FINAL AMPERAGE control ad- justs the welding amperage at the finish of the weld and operates on the same principle as the PERCENTAGE INITIAL AMPERAGE control. The final amperage can- not be higher than the weld amperage provided by TIG- Unit.

IMPORTANT: This control may be adjusted while welding.

4-19. PREFLOW TIME CONTROL & SWITCH (Optional) (Figure 4-1)

PREFLOW TIME

t 1

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.

An adjustable 0 to 15 second coolant-gas PREFLOW TIME control can be provided for controlling the period of time shielding gas and coolant flows before the arc is initiated. The PREFLOW TIME control governs the op- eration of a preflow timer within the TIG-Unit.

Rotating the control in a clockwise direction increases the preflow time. The scale surrounding the PREFLOW TIME control is calibrated in seconds to aid in the selec- tion of a preflow time period suited to the individual weld- ing operation.

As soon as the remote contactor control switch has been closed, the preflow timer begins to time out the se- lected period of preflow time. Once the timer has timed out, the gas and coolant valves remain open and the contactor closes providing weld power. The timer auto- matically resets and is ready for another weld cycle whenever the contactor is opened.

When coolant-gas preflow is desired, the PREFLOW TIME switch must be placed in the ON position. Con- versely, by placing the PREFLOW TIME switch in the OFF position and rotating the PREFLOW TIME control to minimum, coolant-gas preflow is not available.

WARNING: ELECTRIC SHOCK can kill.

• Do not touch live electrical parts.

•Set PREFLOW TIME control (if applicable) to 0 (minimum) when not using the preflow device.

The preflow device (if applicable) is always active even though the PREFLOW TIME switch is in the OFF posi- tion.

4-20. SPOT TIME CONTROL AND SWITCH (Optional) (Figure 4-1)

SPOT TIME

t

An adjustable 0 to 5 second SPOT TIME control can be provided for controlling the period of time weld power is available for spot welding. The SPOT TIME control gov- erns the operation of a spot timer within the TIG-Unit.

Rotating the control in a clockwise direction increases the spot time. The scale surrounding the SPOT TIME control is calibrated in seconds to aid the selection of a spot time period suited to the individual welding opera- tion.

When spot welding is desired, the SPOT TIME switch must be placed in the ON position. Conversely, by plac- ing the SPOT TIME switch in the OFF position, spot welding is not available, despite the position of the SPOT TIME control.

The spot weld timer begins to time out as soon as an arc is initiated. When the time set on the SPOT TIME control has elapsed, weld output is cut off and the postflow timer starts.

Upon closure of the remote contactor control switch, the operator may proceed with establishing an arc provided that the preflow timer, if applicable, has timed out. As

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Miller Electric KC237900 manual Percentage Final Amperage, Spot Time, Preflow Time Control & Switch Optional Figure
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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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