Minarik DIGI-LOK DLC300, User Manual, Page: 30 / 44

Programming Instructions 20
The governing equation is:
SSF= [(SPEED SETTING)/(SHAFT RPM)] X [3000/PPR] [1]
Select any speed setting and the corresponding shaft rpm. The
entire numerical speed setting entry has to be used in this
equation. Delete the decimal point, if present. The number of
feedback pulses per revolution is known. Substitute these values
into Equation 1 and calculate SSF. Round off this value to the
nearest whole number. Any value from 1 through 9999 can be
accepted as the DLC Speed Scaling Factor.
The DLC is set at the factory for use with a 60 pulse-per-
revolution feedback device. It is set for entering directly the speed
of the monitored shaft in rpm. By Equation 1, then, the correct
value for the Speed Scaling Factor under these conditions is 50.
Assume that you need to calculate the SSF for an application
involving a different set of parameters: A 100-line encoder is
mounted on a pinch roller shaft. Speed is to be set in feet per
minute, to one decimal place. A setting of 180.0 fpm is equivalent
to the roller rotating at 120 rpm. Substituting into Equation 1:
SSF = [(1800)/(120)] X [3000/100] = 450
Notice that the first term substituted into the equation is "1800",
not "180.0". Always drop the decimal point, if there is one, when
using the speed setting value in this equation.
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