UB25 LINEAR DC RESISTANCE WELDING CONTROL
990-665 3-1
CHAPTER 3
Using UB25
Welding and Monitoring Functions
Section I: Introduction
To ensure accurate, consistent welds, the Power Supply delivers extremely precise pulses of energy to the
weld head. Each pulse is comprised of weld-time and weld-energy (voltage, current, or power) values
pre-programmed by the user. The Power Supply is a closed-loop welding control using internal and
external sensors to measure the weld-energy delivered to the weld head. Weld-energy feedback instantly
goes to the Power Supplies logic circuits that actively correct the pulse to compensate for any variation in
part resistance. The Power Supply also has several monitor functions that give you remarkable control
over the welding and production process. Together, these features ensure precise, consistent welds, higher
productivity, a lower rejection rate, and longer electrode life.
Before operating the Power Supply, it is important to know how to match the Power Supplies capabilities
to specific weld applications. This chapter provides Weld, Feedback, and Monitor details in the
following sections:
• Weld Schedules
− Single-Pulse
− Upslope / Downslope
− Dual-Pulse
• Programmable Feedback Modes
• Weld Monitor
− Active Part Conditioner
− Energy Limits
− Pre-Weld Check
Chapter 4, Operating Instructions, contains the step-by-step instructions on how to program each of the
functions above.
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