Rotary Pulse Indicator K3HB-R 9
■ What Is Prescaling?
To make calculations using the input pulse to display rotation (rpm)
or circumferential speed, the number of pulses per rotation or the
length of the circumference must be multiplied by a certain
coefficient. This coefficient is called the prescale value.
Rotation speed (rpm) = f
× 60 × a
f: Input pulse frequency (No. of pulses per second)
a: Prescale value
If there are 5 pulses per rotation, then
a = 1/5 (= 0.2 = 2
× 10
-1
)
and an accurate rotation speed (rpm) can be calculated.
The actual setting is X = 2.0000 (mantissa) and Y = 10
-1
(exponent).
■ What Is the Auto-zero Function?
(Set this function before using the Digital Indicator.)
If a function
f1 to f6 is set, the frequency can be force-set to zero if
there is no input pulse for a set period. This period is called the auto-
zero time. Set the auto-zero time to slightly longer than the longest
input pulse interval. (The display will not easily return to zero if the
auto-zero time is too long or left at the default setting.)
Time Unit Settings
Note: Time unit can be set only when passing time (F6) is selected.
Input Type Setting
Note: Set to 10 or 11 when there is a large variation in the display.
The largest measurement range is 30 Hz.
Proximity
sensor
K3HB-R
Setting Meaning
scal Prescale value menu setting
min Minute display
h.mm.ss h.mm.ss display
mm.ss.d mm.ss.d display (d = tenths of a second)
NO: Voltage pulse high NC: Voltage pulse low
No-contact or
voltage pulse
input
00 01
Contact 10 11
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