Amada Miyachi Unitek STA-100A, Operation Manual, Page: 25 / 154

STA SERIES AC CONTROLS
990-351 2-1
CHAPTER 2
INSTALLATION AND SETUP
Section I: Planning for Installation
Environmental Factors
We recommend that you install the Control in a well-ventilated area that is free from excessive dust,
weld expulsion, acids, corrosive gasses, salt, moisture, oil, coolant, and contaminants. Allow adequate
space around the unit for power and signal cabling runs, water-cooling hose connections, and full length
of open front door. Electrical and signal connections may be made from either the top or bottom of the
Control.
The Control is designed to work in the following ambient conditions:
Temperature: 32-104°F (0-40°C)
Humidity: 0% to 95%, non-condensing
Maximum altitude 9800 ft. (3000 m)
Space and Mounting Requirements
Outline drawings of the STA Controls, including dimensions for the mounting holes, are included in
Appendix A, Technical Specifications.
Power Requirements
Power requirements are: 230 or 460 VAC (nominal), single phase, 50/60 Hz. (See Appendix A,
Technical Specifications, for exact ranges.) Other voltages are available upon request.
NOTE: The Control is a component of a larger resistance welding system. Please review the complete
system requirements in order to install this component in compliance with all applicable codes and
requirements. The external disconnect device must be rated no less than 115 percent of the full load
current. If the Control does not have an internal circuit breaker, an external power control (ON/OFF
switch or contactor) must be provided at the junction box that feeds power to the Control.
Cooling Water Requirements
See Appendix A, Technical Specifications , for SCR cooling water requirements. The connections to the
SCR are made with ¼-18 NPT fittings through the bottom of the Control cabinet.