Omron K3NR User Manual

28
3-3 Error Ratio: f3
Application example
Measures the speed
of the conveyor belts
and the error ratio in
the rotation of the
conveyor belts.
Basic Operation
Displays the error ratio of the frequency of INA and INB in percentage. Obtain
display value D as follows:
D (%) =
x 100
f
B
x β – f
A
x α
f
A
x α
f
A
: Input frequency of INA (Hz)
f
B
: Input frequency of INB (Hz)
α: Prescale value of INA
β: Prescale value of INB
Mode Unit of display Prescale value
Error ratio % Na and Nb or
πda/Na and
πdb/Nb
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
–3
Prescale value of INB (β) = 0.125/100 = 0.00125 = 1.2500 x 10
–3
Prescale value = X x 10
Y
(X: mantissa, Y: exponent)
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.
FUNCTION
SETTING
REFERENCE
Error Ratio: f3
Section 3-3

Omron K3NR Specifications

General

Brand	Omron
Model	K3NR
Category	Measuring Instruments
Language	English