Elgar SW 5550AE Operation Manual page 54

Operation
the ramp. The SW will calculate an even number of voltage or frequency steps, over
the time period of the current segment (value specified in the Time field), to reach the
values specified in the following segment.
A ramp must always consist of at least two segments so that starting and ending
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values can be specified.
Ramps can be increasing or decreasing in value.
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Voltage ramping for Phase A, Phase B, Phase C, and Frequency are all
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independently controlled and can be run in any combination. For example,
Phase A could be ramping a Sine wave from 0 to 120 VAC, Phase B could be
ramping from 28 to 0 VDC, Phase C could be a steady 230 VAC Square wave,
and the Frequency could be ramping from 50 Hz to 400 Hz - all at the same time.
Phase angles cannot use the ramping function.
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Ramp steps occur in increments of the period specified in the FREQ field. If
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FREQ is 60 Hz, steps occur at 16.67 ms intervals. If the FREQ field is 500 Hz,
updates occur at 200 µs intervals. For DC ramping, use the highest frequency
(500 Hz) to make the ramp as smooth as possible.
If the specified ramp time is less than one period, one period will be used.
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Function keys F1 through F3 are required to create and edit sequences. These keys
are dependent on the field select cursor position and are defined as follows:
The "SEG" Edit Field
The SEG edit field is used to move through the segment list and accept integer values
from 0 to 99. Since a Sequence is made up of a continuous list of segments, segments
must be created in sequential order. When the Sequence scratchpad is initialized, only
a single segment is available for editing. Trying to access segments other than seg-
ment 0 will result in an "end of sequence" error message. An existing segment number
can be entered directly into the SEG field, or you can select the SEG field by pressing
the Enter key, then use the Arrows or the Knob to scroll through all existing segments.
The function keys are used to insert, delete or copy segments:
Inserts a new segment in the position immediately following the current
F1
segment. The new segment number will be one greater than the currently
displayed segment. The Segment edit field will be automatically updated to
display the newly created segment.
Deletes the currently displayed segment.
F2
Copies the previous segment information to the currently displayed segment.
F3
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SW 5550AE • SW 3700AE • SW 1850AE
Operation Manual