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3-1 Rotational/Circumferential Speed: f1
Application example
Measures the rotations of the roll.
Basic Operation
Multiplies the input frequency (Hz) of INA by 60 and displays the result in rpm.
When the appropriate prescale value is selected, the rotational speed of the ob-
ject is displayed. Obtain display value D as follows:
D = f
A
x 60 x α
f
A
: Input frequency of INA (Hz)
α: Prescale value
INB input will be ignored.
Item Unit of display Prescale value
Rotations rpm 1/N
rps 1/60N
Frequency of input
pulse
Hz 1/60
kHz 1/60000
Rotational speed mm/s
1000πd/60N
cm/s
100πd/60N
m/s
πd/60N
m/min
πd/N
km/h
0.06πd/N
Where,
N: Number of pulses per rotation
πD: Length (m) of one rotation
Example:
Displaying rotations (rpm) on condition that there are two pulses per revolu-
tion.
Prescaling value (α) = 1/2 = 0.5 = 5.0000 x 10
–1
Prescale value = X x 10
Y
(X: mantissa, Y: exponent)
X (mantissa) of input A = 5.0000
Y (exponent) of input A = –1
Refer to 4-2 Setting Mode.
FUNCTION
SETTING
REFERENCE
Rotational/Circumferential Speed: f1
Section 3-1
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