Toshiba G7 Series Applications Workbook page 28

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Frequency Priority Switching
Introduction
In some applications where the analog speed reference input needs to be switched during operation,
the drive can be programmed to accommodate that. In this application note, two methods are
described to switch the frequency input. The first method uses a discrete input to switch between two
analog inputs for speed reference. The second method uses a programmed parameter value for
switching reference, but it is different from the first one in terms of when the switching back to the
other is taking place.
In both examples, Maximum Frequency and Upper Limit are set to 60 hz for ease of explanation. II
and RR inputs are both scaled as 0 – 60 hz span. Please see application note on configuring the
analog input if required.
Method 1 -
Connections
TERMINAL STRIP
S1 CC II CC RR PP
4 – 20 mA 0 – 10 VDC
0 – 60 Hz 0 – 60 Hz
In this example, RR input is programmed as Frequency mode #1 and II as the #2.
When S1 is left open, the drive takes the input from RR as its speed reference. When S1 is closed,
the drive takes the II as its speed reference. The S1 can be opened and closed while the drive is
running.
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For additional assistance, please contact Toshiba Adjustable Speed Drive Marketing Dept. at (800) 872-2192