129506 2012-12
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KFU8-DW-1.D
Operation
Example:
In normal operation, a machine requires a maximum of 50 s to run up
to a nominal speed of 500 rpm. Set the startup override time to a
value greater than 50 s. When the period of 50 s has elapsed, the
underspeed monitoring function (relay function 5) is active. If the
startup runs according to plan within this time, the relay will not have
actuated.
If the startup takes longer than anticipated, then the relay will switch
50 s after commencement of the startup override, until the upper
hysteresis limit has been reached.
Display rate
(factory preset: 0.33 s)
In order to ensure good readability of the display, the time taken to
indicate the current measured value in the display can be selected
between 0.01 s and 2.5 s.
Note!
The display rate influences neither the time required to calculate the
measured value nor the switching characteristics of the output relay.
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