Sonics GXL - Manual (Page 26)

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I N S T R U C T I O N M A N U A L • M O D E L G X L P O W E R S U P P LY
25
TRIGGER
Selection of the trigger mode is achieved by pressing the Trigger Key and
then using the Up/Down arrow keys as a toggle to select one of the following
modes to act as the trigger to start ultrasonics.
Delay Timer – selecting this mode means that the ultrasonics will be
triggered when the Delay Time specified in the Time menu is reached.
Force/Pressure – selecting this mode means that the ultrasonics will be
triggered when the Trigger Force (Pressure) specified in the Amplitude/
Pressure menu is achieved.
Distance – selecting this mode means that the ultrasonics will be triggered
when the Pre-Trigger Distance specified in the Distance menu has been
traveled.
Effect of Trigger Selection
The measurement of the precise contact point (the position at which the horn
first contacts the parts), and subsequent Distance Incremental set point may
be affected by the trigger scenario. A better distance reference is produced
the longer the system is allowed to stop moving and come to rest. Using a
Delay Timer trigger will yield the best measurement of the reference contact
point. Using a Force/Pressure trigger will yield a better reference distance
measurement than the Distance trigger. The scenarios described below
illustrate how incremental distance measurement can be affected.
With Trigger Mode set for Distance – If the Pre-Trigger distance setting is
less than the travel distance to the parts, then the ultrasonics will already
be on when the horn contacts the parts. Since ultrasonics are on, the
reference distance measurement is taken immediately (if the system is
welding by incremental distance setpoint) and this is not ideal for reference
capture.
With Trigger Mode set for Delay Timer – If the system has been
programmed with a delay time value greater than 0.00, the system has
more time to stop moving and the reference point measurement will be
even better. That’s why the incremental weld measurement consistency
should improve.
A review of the Basic Weld Cycle Time Line on page 52 gives additional
information on the start/stop/measurement process.
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