BALTECH VP-3470
Operation manual
Operation conditions and prestarting procedures 29
The laser tachometer must be installed at a distance of not less than 0.1 m and
not more than 0.2 m.
Apply the reflective film (included in the delivery set) on the open area of the rotor.
Minimum angular dimension of the mark in degrees:
α
min
= K
α
* n / 1000
where n – shaft rotation frequency, rpm,
K
α
= 3º - conversion factor
Minimum linear dimension of the mark in millimeters (when applying on the cylindrical
surface of the shaft):
L
min
=K
L
* n * D / 100000 L
min
=K
L
* n * D / 100000
where n - shaft rotation frequency, rpm,
D – shaft diameter, mm
K
L
= 2,618 rpm - conversion factor
Example:
If n = 9000 rpm and D = 120 mm, the mark length must be more than 28 mm
(27º). The width of the mark must be sufficient for convenient positioning of the
laser beam.
The laser beam of the tachometer must fall on the reflective film. During the shaft
rotation the tachometer will give an impulse when detecting the mark.
To set up the maximum sensitivity of the tachometer turn the shaft in such a way
that the mark doesn’t reflect the beam and press the button on the tachometer.
Hold the button till the status led lights up.
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