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Inrush
Tips and Hints15
15-3
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:
F1
Assign up/down arrow keys to select a set of trends for
display.
F2
Cursor on/off.
F3
Assign arrow keys to Cursor or Zoom operation.
F5
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.