Rotational Difference: F4 - Omron K3NR Operation Manual

Rotational Difference: f4

Rotational Difference: f4
3-4
FUNCTION
SETTING
Application example
Basic Operation
Displays the rotational difference of INA and INB. Obtain display value D as fol-
lows:
x 60 x β – f
D (rpm) = f
B A
f : Input frequency of INA (Hz)
A
f : Input frequency of INB (Hz)
B
α: Prescale value of INA
β: Prescale value of INB
Mode Unit of display
Rotational rpm
Difference
Hz (Input pulse
frequency)
mm/sec
m/sec
m/min
Where,
Na: Number of pulses per revolution from A input
Nb: Number of pulses per revolution from B input
πda: Circumference (m) per revolution for A input
πdb: Circumference (m) per revolution for B input
Example:
Displaying error in frequency (Hz) using two rotary encoders each with 100
output pulses per revolution.
Prescale value of INA (α) = 1/60 = 0.01666... 8 1.6666 x 10
Prescale value of INB (β) = 1/60 = 0.01666... 8 1.6666 x 10
Y
Prescale value = X x 10
X (mantissa) of input A = 1.6666
Y (exponent) of input A = –2
X (mantissa) of input B = 1.6666
Y (exponent) of input B = –2
x 60 x α
INA
INB
INA
INB
INA
INB
INA
INB
INA
INB
(X: mantissa, Y: exponent)
Section 3-4
Measures the rota-
tional difference of
the conveyor belts.
Prescale value
1/60Na
1/60Nb
1/60
1/60
π
1000 da/60Na
π
1000 db/60Nb
π
da/60Na
π
db/60Nb
π
da/Na
π
db/Nb
–2
–2
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