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Digital Panel Meter: Set Parameter to Display Rotation Speed

FAQ No. FAQ00768

Primary Contents

Question

Which parameter should be set in order to display the K3NR Digital Panel Indicator's rotation speed?

Answer

When you want to display the rotation speed on the K3NR, the rotation speed will be expressed as:
Rotation speed (rpm) = Input frequency f (Hz) × 60 × α.

α = Prescale value

When displaying rpm with 2 pulses/rotation, make the following settings from the setup menu.

When 2 pulses are output/revolution, α = 1/N = 1/2 = 0.5 = 5.0000 × 10-1 m:

Reference: Calculating the Prescale Values

Equation variablesDisplay unitsPrescale value (a)
Speedrpm1/N
rps1/60N
Frequency (of input pulses)Hz1/60
kHz1/60000
Circumferential speedmm/s1000 πd/60N
cm/s100 πd/60N
m/sπd/60N
m/minπd/N
km/h0.06 πd/N

N: Number of pulses per rotation
πd: Circumference (units: m)