Amada 1-288-01, Operation Manual, Page: 50 / 144

CHAPTER 3: SYSTEM CONFIGURATION
HF28 DC RESISTANCE WELDING SYSTEM
3-18 990-372
Weld Head Applicability
The weld functions can be used with Miyachi Unitek force fired, manual weld heads; air actuated weld
heads; or Series 300 Weld Heads.
SQUEEZE TIME
is used to allow sufficient time for the electrodes to
close and apply the required weld force to the parts before the weld current begins. Weld current begins
when the squeeze period ends.
When the weld functions are used with any type of air actuated weld head, the hold period can be used
to automatically keep the electrodes closed on the parts after weld current has terminated to provide
additional heat sinking or parts cooling.
NOTES:

Miyachi Unitek Series 300 Electronic Force Controlled Weld Heads: The
SQUEEZE TIME
is controlled by the weld head, not the Control.
SQUEEZE TIME
begins when the force-firing
switch closes, therefore you will set the Control
SQUEEZE TIME
to zero and set the
DEBOUNCE
TIME
to zero.

Air-Actuated Weld Heads: For force fired, air actuated weld heads,
SQUEEZE TIME
begins
when both levels of a two-level foot switch are closed and the force firing switch in the air
actuated weld head closes.

Manual Weld Heads: For manually actuated weld heads,
SQUEEZE TIME
begins when the
force-firing switch closes. Using
SQUEEZE TIME
is optional, depending on the welding process
you have developed.
When To Use Functions
To ensure accurate, consistent welds, the Control 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 Control 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 Control's logic circuits that actively correct the pulse to compensate for any variation in part
resistance. The Control 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 Control, it is important to know how to match the Control's capabilities to specific
weld applications. This section provides Weld details in the following order:

Weld Schedules

Single-Pulse

Upslope/Downslope

Dual-Pulse
Chapter 5, Operating Instructions , contains the step-by-step instructions on how to program each of the
functions above.