Amada 1-288-01, Operation Manual, Page: 15 / 144

HF28 DC RESISTANCE WELDING SYSTEM
990-372 1-1
CHAPTER 1
Description
Section I: Features
Features
For the rest of this manual, the Miyachi Unitek HF28 High Frequency Resistance Welding System
control will simply be referred to as the Control .
NOTE: This manual describes HF28 Models
1-310-01, 1-310-01-01, 1-310-01-02
manufactured after
June 2005. These contain significant differences than earlier models. HF28 models
1-288-01 and 1-288-
01-01
manufactured before June 2005 require a different manual.
For information on getting that manual, use the phone number or e-mail address listed under
Contact Us
in the front of this manual.

The Control is a 25 kHz, three-phase, state-
of-the-art inverter power supply for joining
precision small parts at high speed with
controllable rise times. The delivered
welding energy is in the form of DC welding
energy. High speed (40 microseconds)
digital feedback automatically controls weld
current, voltage, or power, providing more
welding consistency compared to traditional
direct energy (AC) or capacitive discharge
(CD) technologies.

Microprocessor technology automatically
compensates for changes in work piece
resistance, load inductance, weld
transformer saturation, and changes in line
voltage. Special power device technology
precisely controls the weld energy at both
high and low energy levels.

Easy to use constant weld current, voltage,
or power feedback ensures repeatable
welding and has proven to extend electrode
life in many applications by a factor of 3 or
more.
HF28 Front Panel