Unitec Peco HF25A, User Manual

Page: 38 / 177

CHAPTER 3: USING PROGRAMMING FUNCTIONS
HF25 DC RESISTANCE WELDING SYSTEM
3-10 990-333
SETUP 1
1. Footswitch Weld Abort
From the
SETUP 1
screen, press the
1
key to toggle between
ON
and
OFF
. This function controls how
the Control interfaces with a foot switch, a force firing switch, or a programmable logic control (PLC).
Any of these switches could be the weld initiation switch in your system setup.
ON
means that the welding process is initiated by closure of the initiation switch and continues to its
conclusion while the initiation switch remains closed. If the initiation switch opens during the welding
process, the welding process will terminate. The
ON
state is preferred for human operated welding
stations since it allows you to abort the weld process by releasing the foot switch (or the foot pedal in the
case of a manually actuated weld head).
OFF
is preferred for computer or PLC controlled welding stations since a single start pulse can be used
to initiate the welding process. To select the
ON/OFF
states, press the
1
key. The
FOOTSWITCH WELD
ABORT
line will now reflect your selection.
2. Switch Debounce Time
The contacts of single pole mechanical firing switches “bounce” when they close. The switch de-
bounce time function allows you to specify that the initiation switch contacts must remain closed for 10,
20, or 30 milliseconds before the weld period can be initiated, thereby avoiding false starts caused by the
switch contact bouncing.
1. From the
SETUP 1
screen, press the
2
key to go to the
SWITCH DE-BOUNCE
TIME
menu screen.
2. Select the required debounce time by
pressing the
1
,
2
,
3
or
4
key.
NONE
represents a debounce time of 0 ms.
<SWITCH DEBOUNCE TIME>
1. NONE
2. 10 ms
3. 20 ms
4. 30 ms
NUMBER Select, MENU Previous menu
Use
NONE
for interfacing with the Unitek Peco Model 350C Electronic Weld Force Control.
3. Press the
MENU
key to return to the
SETUP 1
screen. The
SWITCH DEBOUNCE TIME
line
will now reflect your switch debounce time selection.