Amada Miyachi / Unitek Miyachi Dual Pulse 125 Stored Energy Power Supply

The Amada Miyachi / Unitek Miyachi Dual Pulse 125 is a stored energy, capacitor discharge power supply engineered for high-precision resistance welding in medical devices, electronics, and critical industrial applications. Microprocessor control delivers digital precision with selectable energy output up to 125 Watt-seconds (Ws) and dual pulse capability to improve weld quality on plated materials, eliminate splash, and enhance consistency on small wire assemblies.

Technical Specifications

• Energy Output: Selectable up to 125 Ws with display resolution from 0.1% to 0.5% depending on selected energy level


• Energy Display Accuracy: 0.5%


• Line Voltage Regulation: ±0.25% capacitor bank voltage maintenance across ±13% line voltage deviation from nominal


• Turndown Circuit: Resistive discharge across capacitor bank with 0.6% full-scale deadband


• Output Pulse Characteristics: Rise time measured zero to peak amplitude; pulse width measured between 10% amplitude points across 0.001 Ω non-inductive load

Key Features

• Dual Pulse Technology: Two-stage weld sequence - first pulse seats electrodes and removes surface contamination at lower energy; second pulse joins base metals at three to four times first pulse energy


• Weld Schedule Storage: Up to 128 programmable weld schedules with protection on 7 schedules against unauthorized changes; one schedule designated as scratch-pad


• Charging Circuit: Silicon controlled rectifiers in patented configuration for high reliability and precise charging intervals; proprietary charging unit improves pulse rise times and repetition rates


• Microprocessor Control: Digital precision control for consistent performance


• Repetition Rate & Hit Rate: Rep Rate defined as average welds per minute based on thermal component ratings with up to 20-minute averaging period; Hit Rate specifies maximum consecutive weld speed on non-continuous basis

Typical Applications Medical device assembly, electronics manufacturing, precision interconnect welding, plated material joining, and small-gauge wire applications requiring repeatable, high-quality results.