CHAPTER 1: DESCRIPTION
UB25 LINEAR DC RESISTANCE WELDING CONTROL
1-6 990-665
STATE DESCRIPTION
RUN
This state indicates the Power Supply is ready to weld and waiting for a start signal. Press the RUN
key on the front of the Power Supply to put the Power Supply in this state.
NO WELD
In this state, the Power Supply does not deliver weld energy to the weld head heads in order to
prevent electrical shock. This state is used for cleaning electrodes or adjusting the air regulators on
air actuated weld. If a start signal is received, the Power Supply will execute its programmed weld
schedule(s) -- but no energy will go to the weld head, and the LCD will display a WELD SWITCH
IN NO WELD POSITION alarm. The WELD/NO WELD switch toggles the Power Supply
between the WELD and NO WELD states.
PROGRAM
In this state, the weld time and energy values can be modified and new schedules can be selected.
From the RUN state, press any one of the WELD SELECTOR KEYS to put the Power Supply in
the PROGRAM state.
TEST
When a weld schedule is changed, the Power Supply has the capability of performing a TEST weld
in order to optimize the feedback control loop and produce the fastest rise-time, minimum-overshoot
weld pulse. The Power Supply can be programmed to ALWAYS do a test weld after a schedule is
changed, ASK to do a test weld after a schedule is changed, or only IF REQUIRED, do a test weld
after a schedule is changed.
STANDBY
When an air actuated weld head is being used, the Power Supply will go to the STANDBY state
when the footswitch is pressed.
SQUEEZE
When a start signal has been received, the Power Supply enters the SQUEEZE state for the duration
programmed in the schedule. An adequate amount of squeeze time should be programmed to allow
the weld head to settle before the WELD period begins. The default SQUEEZE time is 150
milliseconds. NOTE: In addition to the debounce time, there is a delay of no greater than 2.5ms
before the start signal is recognized by the Power Supply.
WELD
The WELD period begins after SQUEEZE time has ended and includes both weld pulses as well as
the Cool time between Pulse 1 and Pulse 2.
HOLD
The HOLD period begins after the WELD period ends and lasts for the duration programmed in the
schedule. An adequate amount of hold time should be programmed to allow the electrodes to sink
the heat away from the welded parts. The default HOLD time is 50 milliseconds. It is during the
HOLD time that the weld strength is formed.
END
The Power Supply will enter the END state after the HOLD period if the firing switch or footswitch
has not yet been released.
MONITOR
This state allows you to view waveforms of weld voltage, current, power, and resistance. Press
the ENERGY key to go to the MONITOR state. The LCD will show the actual trace of energy of
the last weld performed. You can also view the peak or average energy value for each weld pulse as
selected by pressing the PEAK/AVERAGE key. If a start signal is received while in the MONITOR
state, the Power Supply will execute the programmed weld schedule and the waveform trace will
update with the new weld data. The operational state will then read RUN, and the LCD screen will
show the monitored data.
ALARM
The Power Supply automatically goes into an alarm state when it recognizes any alarm condition
(these are described in detail in Appendix E, LCD Display Messages).
MENU
Pressing the MENU key puts the Power Supply in the MENU state, which displays the MAIN MENU
on the LCD. A series of menu and sub-menu screens enable you to change the Power Supplies
operating parameters (see Chapter 4, Operating Instructions).
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