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1.2.6 Upper Limit Switch
The optical Upper Limit Switch (ULS) signals the control circuits in the
programmer that the carriage has returned to the top of its stroke and the
welder is ready to start another weld cycle.
The programmer uses this ULS signal to perform various control functions.
For example:
• Indexing control — in automated systems, the READY signal
developed by the programmer after the ULS is activated can be
used by external devices to prevent movement of the material
handling equipment (indexing) when the horn is not fully retracted.
• Electronic pretriggering — the programmer can use the ULS signal
to activate ultrasonic energy before the horn contacts the
workpiece. Pretriggering is used with large or difficult-to-start horns
and in a variety of applications.
1.2.7 Alarm Connector
External controls and devices, such as ALARMS, WELD ON and EX'IERNAL
RESET signals, are available through a +24V DC interface on the back
panel of the welder. In addition, a READY signal is available as both +24V
DC and isolated contact closure. Using this interface, selected faults or
weld errors sensed by the welder can be communicated outside the
welder for monitoring cycles and sorting suspect workpieces.
1.2.8 Dynamic Triggering and Follow
-
Through
Many weld applications require that force be applied to the workpiece
before ultrasonic energy is activated. To achieve this, the welder contains
a Dynamic Triggering Mechanism, located between the air cylinder and
the carriage. The Dynamic Triggering Mechanism initiates (triggers)
ultrasonic energy after a preset force is applied to the workpiece. Dynamic
follow-through maintains a consistent force on the workpiece during the
weld collapse. This system helps provide uniform weld quality.
The calibrated TRIGGER PRESSURE control, located on the front panel,
allows you to record and duplicate the dynamic triggering force.
Introduction
1-6
900IW+
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