2 operation starting frequency [frun, 3 operation starting frequency hysteresis [fh*js, 2 operation starting – Toshiba VF-SX User Manual
Page 125: Frequency, Frurt, 4 toshiba, Figure 12.2 operation starting frequency, 2 operation starting frequency [ f r u n, F h ] ), F h ' d s
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12-4
TOSHIBA
12.2.2 Operation Starting Frequency
[ F r u n ]
The drive will output a frequency ramp when the operation starting frequency
[ F r u r i ]
is reached or exceeded by the frequency setting signal. The
operation starting frequency parameter can be set between 0 and the maximum
frequency
( [ F H ] )
setting.
12.2.3 Operation Starting Frequency Hysteresis
[ F H * J S ]
This value provides “hysteresis", or memory in the vicinity of the operation
starting frequency so that the drive will not toggle ON and OFF if a remote
control signal is oscillating just above and below the operation starting
frequency. In Figure 12.2 below, the drive will turn off when the remote setting
signal drops below [
F r u r t ]
-
[ F H ' d S
], and will not allow the drive to
turn on again until the frequency setting signal exceeds
[ F
i~UD] +
i F H y S ] .
Output
Frequency
Figure 12.2 Operation Starting Frequency