Tweco WC 1 Weld Sequence Controlle - Manual (Page 9)

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3.0 WELD SEQUENCE EVENTS
3.1 Weld Sequence Parameters
The WC 1 Plasma Weld Sequence Controller provides the following user defined parameters:
•
START CURRENT – The value of current to be used during the start time event.
•
START TIME – The amount of time to hold the start current before beginning the Ramp Up
Event.
•
RAMP UP TIME – The time required to ramp from the start current to the run current.
•
RUN CURRENT – The value of current to be used during the Run time of the weld cycle.
•
WELD TIME – The user defined spot weld time when enabled.
•
% TAPER CURRENT - The % of Run current used as the end current level for the taper
time and the start of the Ramp Down Event.
•
TAPER TIME – The amount of time required for the Current Taper Event.
•
RAMP DOWN TIME – The amount of time required to ramp from the % Taper current
value to the End current value prior to the End Current Event.
•
END CURRENT - The end cycle current level to be used during the End Cycle Time.
•
END TIME – The amount of time required for the end weld event.
3.2 Pulse Weld Mode Parameters
If the Pulse mode is enabled the following parameters will be used to define the pulse conditions:
•
PULSE ON TIME – Specifies the Pulse On time period when the Pulse mode is enabled.
•
PULSE OFF TIME – Specifies the Pulse Off time period when the Pulse mode is enabled.
•
% PULSE CURRENT – Specifies the percent of the Run current that will be used during
the Pulse Off time period.
3.3 Weld Cycle Events
The Weld cycle is initiated by asserting the Cycle Start Input. The controller will monitor the Arc
Active input and will assert the Active output when active. The controller will set the Thermal Arc
Power source to the value specified by the Start Current Parameter. After the Start time has expired
the Current output would be ramped to the Run current value over the Ramp Up time specified. At
the end of the Ramp Time the Run current value will be active. If the Pulse mode is enabled the
Pulse On time will be used to specify the time at Peak Current. The Pulse Off Time and Percent
Current will be used to define the background pulse condition. If the Spot Time is Disabled the
controller will continue to operate in the Run Event. When the Cycle Start is reset the controller will
begin the Taper Time and ramp the Run current to the level specified by the Percent Taper
parameter. If the Pulse mode is enabled the pulsing will start during the Ramp Up event and will
continue through the ramp down event. At the end of the ramp down time the controller will set the
End Current value and will hold this value for the time specified by the End Time parameter. The