Dukane Ultrasonic Generator 403-575-00 - Manual (Page 94)

The Cycle Terminates During Downstroke
The system is in downstroke when the cycle has been successfully started and the
head travels towards the part. If the cycle is terminated during downstroke, all trig-
ger, weld, and hold characteristics are displayed as zeroes.
Figure 6-2 shows results of a cycle terminated during downstroke due to either
an end of weld/ground detect error or a condition where activation switches were
released before the trigger (there is no error code for this condition).
PART DOWNSTROKE DOWNSTROKE WELD TIME WELD DIST WELD ENERGY HOLD TOTAL TOTAL
COUNT TIME DIST PRESSURE 1 PRESSURE 1 PRESSURE 1 TIME CYCLE TIME STROKE
39 0.655 1.1959 0 0 0 0 0.655 1.1959
40 0.748 1.4229 0 0 0 0 0.748 1.4229
41 0.819 1.7946 0 0 0 0 0.819 1.7946
Figure 6-2 Cycle Terminated by I/O During Downstroke
Process limits can be set for all process segments including downstroke.
Figure 6-3 shows the effect of a high bad part limit on Downstroke Time.
In this example, the Downstroke Time was limited to 0.500 second. When
the Downstroke Time reached 0.500 second, the cycle terminated and
marked the part as Bad.
PART DOWNSTROKE DOWNSTROKE WELD TIME WELD DIST WELD ENERGY HOLD TOTAL TOTAL
COUNT TIME DIST PRESSURE 1 PRESSURE 1 PRESSURE 1 TIME CYCLE TIME STROKE
12 >>0.500 0.3462 0 0 0 0 0.500 0.3462
Figure 6-3 Cycle Terminated by High Bad Limit During Downstroke
When using pre-trigger, part contact must occur within 0.75 inch after the
application of ultrasound. If the weld is not complete or the trigger switch
does not close within 0.75 inch from the start of pre-trigger, the cycle is
aborted. Figure 6-4 shows cycles terminated for this reason. The pre-trigger
distance was set at 1.000 inch. Note that the Downstroke Distance is 1.7527
inch for part number 56. This is equal to the 1.000 inch pre-trigger distance
plus the 0.75 inch overtravel. The system can overshoot slightly due to
thruster momentum.
Figure 6-4 Cycle Terminated Due to Pre-trigger Overtravel
PART DOWNSTROKE DOWNSTROKE WELD TIME WELD DIST WELD ENERGY HOLD TOTAL TOTAL
COUNT TIME DIST PRESSURE 1 PRESSURE 1 PRESSURE 1 TIME CYCLE TIME STROKE
56 0.887 1.7527 0 0 0 0 0.887 1.7527
57 0.831 1.7522 0 0 0 0 0.831 1.7522
58 0.827 1.7516 0 0 0 0 0.827 1.7516
Page 88
iQ Series Ultrasonic Generator/Power Supply ES User’s Manual
Dukane Manual Part No. 403-575-00