CY-210B | SC-210 Contactor |CT-110B

Using Secondary Constant Current to gain control of your resistance welding process can result in less down time, reduced scrap, and higher production efficiencies.

• Standard features include a built in weld monitor, conduction degree monitor, and error monitor for simultaneous viewing of both programmed and actual weld data.
• Standard functions include two stage initiation, pulsation, up and down slope, forge delay, and preheat/post heat.
• Increased flexibility with 15 weld schedules, 2 valve output signals, 9 steppers, and self diagnostics.
• Direct programming of the actual weld current
• AC weld controls and contactors with flexible options.

Miyachi’s Weltouch(tm) AC weld controls with secondary constant current feedback examine each half cycle of the actual weld current flow and compensate for the changes in secondary current during welding. Standard built-in current and conduction degree monitors allow for simultaneous viewing of both programmed and actual weld conditions. Miyachi’s secondary constant current feedback combined with our built-in weld monitors can provide a higher degree of accuracy, confidence, and control in AC resistance welding. The Weldtouch SC-210 and CY-110B offer a variety of SCR sizes and optional contactor accessories. The Weldtouch CY-210b and CT-110B are easily adaptable to most existing contractor cabinets.

The following graphs show the difference a Constant Current Control can make:

Trend Lines — CY-210B & CT-110B

Primary Line Voltage
This is what your primary line voltage does when presented with a load.

Secondary Welding Current – Open Loop
See the corresponding drop in secondary weld current.

Secondary Welding Current with Constant Current Feedback
Now see how the constant current control keeps the secondary current from dropping off.

Constant Current Feedback Theory

Using a toroidal coil, the current wave form is reconstructed from the output signal. It is then transformed into an RMS effective value using the following formula:

The control then compares this effective value with the set current value. The weld current is corrected with every half cycle through phase conversion and trigger pulse oscillation. The result is smooth, consistent secondary welding current delivered at the weld regardless of the line voltage fluctuations.

CT-110B Constant Current Weld Control

1. Schedule number: Up to 15 schedules can be stored in memory for instant recall.
2. Three impulse weld time: Provides weld time flexibility for a wide variety of welding applications.
3. Weld Current: Weld 1, 2, 3 can be set and displayed.
4. Current and Conduction degree monitor: Sets the High and Low current limit (1–>99%) and monitors current fluctuation and conduction degrees.
5. Valve and Mode Select: Step-up / Counters / Turn Ratio, +/-% Current Window
6. Caution and Error Indicators: No current, Overtemp, SCR Short, Current Limit, No weld, and Step End.
7. Emergency Stop
8. Reset

CY-210B Constant Current Weld Control | SC-210 Contactor

For more information, or help selecting or pricing a controls system, feel free to contact T. J. Snow.