Rockwell Automation 937CU-DIFRQ_1 Universal Frequency Converter Installation Instructions - Manual (Page 19)

Bul. 937
C Universal Frequency Converter Installation Instructions
Pulses/unit
The menu option Pulses/unit only appears if you have selected a unit other than Hz for the measurement
value display (See
Units).
Depending on the unit chosen, you must enter the number of pulses per revolution, per liter, per m3, or per
km. Pulses per km should also be entered for the unit m/s. For conversions, please consult
section .
Examples:
•The speed of a stirring mechanism will be displayed in rpm (or r/sec). The stirring mechanism consists of
8 stirring blades that are detected by the sensor. The number of pulses to enter per unit (revolution) is
therefore 8.
•Flow through a water meter will be displayed in l/min (or l/h). The meter returns 20 pulses per liter. This
value should be entered. For a display in m3/h, 20,000 pulses per unit (m3) should be entered.
•The speed of a conveyor belt will be displayed in m/s (or km/h). The sensor detects 8 pulses per
revolution on the drive wheel. The drive wheel has a diameter of 0.4 m, thus its circumference is 1.256 m.
Therefore, you should enter 8  1000/1.256 = 6369 pulses per unit (m).
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