Inrush15
Tips and Hints
Use Cursor and Zoom to investigate details of the recorded Trends. Selection of channels to be displayed is done with the up/down arrow keys. Press function key F1 to assign the arrow keys to this.
Via the SETUP key and function key F3 - FUNCTION PREF you can set up the default values of the trigger limits (expected inrush time, maximum current, nominal current, threshold, hysteresis) and Offset and Span of the Trend display. For detailed information see Chapter 20, FUNCTION PREFerences.
Available function keys:
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| Assign up/down arrow keys to select a set of trends for |
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F2
F3
F5
Cursor on/off.
Assign arrow keys to Cursor or Zoom operation.
Switch between HOLD and RUN of screen update. Switching from HOLD to RUN invokes a menu to select immediate (NOW) or TIMED start time which allows you to define start and duration of the measurement.
Tips and Hints
Check the peak currents and their duration. Use the Cursor for readout of momentary values. Check if fuses, circuit breakers, and conductors in the power distribution system can withstand the inrush current during this period. Check also if phase voltages stay stable enough.
High peak currents can cause circuit breakers to trip unexpectedly. Measuring Inrush Current can help in setting trip levels. Since the Analyzer simultaneously captures Inrush Current and Voltage Trends you can use this measurement to check voltage stability as large loads come on line.
