Installation Instructions User guide

Bul. 937C 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 m, 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 m/h, 20,000 pulses per unit (m) 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).