CHAPTER 3: USING PROGRAMMING FUNCTIONS
HF25 DC RESISTANCE WELDING SYSTEM
990-333
3-11
3. Firing Switch
With the
SETUP 1
screen displayed, press the
3
key to select this function. The firing switch input, in
conjunction with or without inputs from the foot switch input, initiates the weld energy sequence. Select
the required switch type by pressing the
1
,
2
, or
3
key. Pressing the numeric keys automatically returns
the display to the
SETUP 1
screen.
1. Auto
The Control accepts a single pole, double pole or
optical firing switch input from a Unitek Peco
weld head. Firing switch activation indicates
that the weld head has reached the set weld
force, thus permitting the weld energy sequence
to start.
<FIRING SWITCH>
1. AUTO
2. NONE
3. REMOTE
NUMBER Select, MENU Previous menu
2. None
When using a non-force fired weld head, weld energy initiation must be supplied with the foot switch
input. Additionally, you must select sufficient squeeze time to permit the weld force to stabilize after
contacting the weld pieces.
3. Remote
Use this setting in an automation application or when using PLC control. The BCD input lines, via the
CONTROL SIGNALS
connector (see
Appendix B. Electrical and Data Connections
), select weld energy
schedules and initiate the weld energy sequence.
4. Input Switch Select
This function selects the type of external switch to be used by the firing switch, foot switch, emergency
stop, and process inhibit inputs; and how these switches are activated.
NOTE:
Before
selecting any of these options, connect
all
desired closed input switches to the Control.
Otherwise an input switch alarm will occur.
1.
From the
SETUP 1
screen, press the
4
key.
2.
Select the required switch type by
pressing the
1
,
2
, or
3
key. Pressing the
numeric keys automatically returns the
display to the
SETUP 1
screen.
<INPUT SWITCH SELECT>
1. MECHANICAL
2. OPTO
3. PLC
NUMBER Select, MENU Previous menu
The
FIRING SWITCH
option will now reflect your switch type selection.
1. MECHANICAL
: Accepts dry contact, single or double pole switch or read relay devices.
2. OPTO
: Accepts opto coupler switch for eliminating switch debounce problems.
3. PLC
: A24 VDC from a PLC as a source for activating the Control inputs.
NOTE:
For detailed electrical interface information on these input switch selections, see
Appendix B. Electrical and Data Connections
.
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