STA Series

The STA-Series are the most advanced, yet simplest welding controls on the market. The STA Series features an intuitive, easy-to-use programming interface and is designed to control and integrate projection welders, press welders, multi-gun machines, portable guns, seam welders, robotic systems, rocker arm welders and special purpose machines.

sta series

Large Scale AC Resistance Weld Controls - STA Series

The STA Series has a wide variety of options, some are installed at the time of purchase, some may be added later. In addition, the operating controls and LCD display screen on STA200A through STA-800A Controls may be installed on the front or side of the Control, depending on your space requirements. As a result, each Control is essentially “custom-built” to your specifications even though it is assembled using standard Amada Miyachi components.

If you have questions about custom items in your Control that are not covered in this manual, contact Us using the phone or email.

Standard Features:

  • Operates on 50Hz or 60Hz, self-detecting, no adjustments needed.
  • Multiple pulse capability.
  • Controlled current ramps.
  • 300, 600, 1200, 1800, or 2200 amp SCRs with constant current control.
  • Water-cooling of the 600A and larger SCR assemblies.
  • Programming features with LCD display.
  • Programmable for spot, repeat, successive, or chaining modes.
  • Continuous seam weld and roll spot seam welding capabilities.
  • Programmable for 64 welding schedules.
  • Valve drivers for up to four user-programmable valves are included in the basic unit.
  • Supports air-actuated Retraction Valves.

Optional Features:

  • A circuit breaker that removes power to the Control when the door is opened (STA-200 through STA-800).
  • A Communications card that allows remote data collection and remote programming of the Control.
  • A Cascade Board Option that allows a Control to operate multiple SCRs. Depending upon the model, up to 8 SCRs can be cascade fired.


A Valve Expansion Option to increase user-programmable valve-driver capability to 12 valves.

A Voltage Monitor Option that allows you to compare results against high and low limits, and monitor either peak or average voltage. This feature allows you to select when the voltage is monitored, either during both weld periods (excluding up/downslope) or during the last cycle of each weld only, which is useful for welding to a specific resistance.

A Force Control (Force Output) Option that can control up to 8 separate (user supplied) electronic pressure regulators. Force is programmed in pounds using front panel controls. The Control makes calculations to create accurate air pressure. Calibration is a simple 2-step procedure using front panel controls.

A Pressure Control Option (Force Input) that uses differential pressure sensors is available for up to eight channels. You may use this feature in a Force-Firing function (welds only when correct pressure is reached), or as a pressure monitor to see if air pressure is in the desired range. Force firing can reduce cycle time by eliminating the need to program squeeze time, and it assures that every weld is made at the optimum force.

High, low and Firing Force limits are programmed in pounds using front panel controls. Calibration is a simple 2-step procedure using front panel controls. Calibration correlates the pounds desired to the equivalent air pressure. This feature will check the air pressure for up to 5 seconds at the start of the squeeze delay period. If the force is within limits, the weld will continue. Otherwise, the weld will be aborted and an alarm will be triggered. If the pressure was out of limits at the end of a weld an alarm will be triggered.

NOTE: This feature requires presence of the Force Control (Force Output) board, but does not require usage of the Force Output feature in order for Force Input to be functional.

Miyachi controls are widely-used throughout the following industries:

  • Consumer Appliances
  • Nut and Stud Projection Welding
  • Electronic and Automotive Components
  • Aircraft Components
  • Office Furniture
  • Automotive Sheet Metal

The following illustrations show a “typical” Control. Your Control may be different due to options that have been installed or to the physical configuration. For example, the LCD Display and operating controls can be factory-installed on the front or on the side of the Control.

miyachi internal



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