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7.5 LCD Bar Graph
While ultrasonic power is active the LCD will always display the power value on the 20-
segment LCD bar graph as a percentage of the maximum output power.
At the end of a weld or test cycle, the bar graph is factory set to represent the cycle’s peak
power as a percentage of the maximum output power.
The power supply can also be configured to show a single bar on the LCD bargraph to
represent the stack operating frequency stored at the end of each weld or test cycle. This
option can be used to troubleshoot operating frequency changes as a result of heating
effects, coupling, tooling wear, etc. When using this feature the option “Store frequency at
end of weld” must also be enabled.
For information on how to set the power supply registers see 7.4 Configuring the Power
Supply Registers.
7.5.1 Power Bar Graph Interpretation
The lightning bolt left of the bar graph indicates ultrasonic power is running. Each of the
segments represent 5% increments of the maximum output power. The segments will only
appear if the output power has exceeded the value represented. For example if the power
is 4% only the lightning bolt will be on. When it reaches 5% the first bar graph segment
will appear.
Table 7.5 Power Bar Graph Interpretation Examples
Description Reference
In this example only the lightning bolt
appears left of the bar-graph. This
means power is between 0% and 5%. If
the power supply is 800 W the actual
output power is between 0 W and 40 W.
In this example the first six segments
appear on the bar-graph. This means
power is between 30% and 35%. If the
power supply is 800 W, the actual output
power is between 240 W and 280 W.
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