DUAL PULSE 125
STORED ENERGY RESISTANCE WELDING POWER SUPPLY
990-270 1-1
CHAPTER 1
SYSTEM DESCRIPTION
Section I: Features
The Miyachi Unitek™ Dual Pulse 125 (125DP) is a stored energy, capacitor discharge, power supply
designed to perform precision resistance welding. The circuitry is solid state, microprocessor controlled,
with components conservatively rated when used within the maximum specified repetition rates. The
charging circuit uses silicon controlled rectifiers in a patented manner which provides high reliability
and precise charging intervals. Special precautions protect against false triggering in high RFI and EMI
environments. It is a multi-voltage unit designed for operation at 100, 115, 200/208, or 230 VAC, 50/60
Hz. The features of the 125DP include:
Energy selectable up to 125 watt-seconds
Dual Pulse Capability which simplifies welding to plated materials
Digital Display allows operators to set energy levels accurately and quickly
Stores up to 8 Different Weld Schedules which facilitates multiple applications at a single
work station
Remote Schedule Selection for use in automation
Air Head Capability is standard feature which allows it to control air actuated welding
heads
Programmable Squeeze Time for non-force fired weld heads
Schedule Protection Feature protects Weld Schedules from changes by unauthorized
personnel
Weld Fire Lockout prevents welding whenever the energy level is not within 1% of the
preset level therefore weld quality is independent of line voltage and the speed at which
the power supply is operated
Protected from Radio Frequency Interference and Electro-Magnetic Interference to ensure
reliable operation even in high electrical noise environments
Multiple Line Voltages - can operate at 100, 115, 200/208, or 230 VAC, 50/60 Hz.
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