Error Ratio: F3 - Omron K3NR Operation Manual

Error Ratio: f3

Error Ratio: f3
3-3
FUNCTION
SETTING
REFERENCE
28
Application example
Basic Operation
Displays the error ratio of the frequency of INA and INB in percentage. Obtain
display value D as follows:
D (%) =
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
Error ratio %
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 ratio of two conveyor speeds (m/min) using two rotary en-
coders each with 100 output pulses per revolution and a circumference of
0.125 m.
Prescale value of INA (α) = 0.125/100 = 0.00125 = 1.2500 x 10
Prescale value of INB (β) = 0.125/100 = 0.00125 = 1.2500 x 10
Y
Prescale value = X x 10
X (mantissa) of input A = 1.2500
Y (exponent) of input A = –3
X (mantissa) of input B = 1.2500
Y (exponent) of input B = –3
Refer to 4-2 Setting Mode.
x β – f x α
f
B A
x 100
x α
f
A
Prescale value
Na and Nb or
π
da/Na and
π
db/Nb
(X: mantissa, Y: exponent)
Section 3-3
Measures the speed
of the conveyor belts
and the error ratio in
the rotation of the
conveyor belts.
–3
–3