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PRESYS
⏐ Instruments
f in Hz
f in rpm
For a 0 to 5000 Hz operation range from an encoder with 100 pulses per
revolution and 0 to 3000.0 rpm (= 60 × 5000 / 100) indication, configure the input as:
Lim Low = 0,
Lim High = 05000 (Hz),
Eng Low = 0.0 and Eng High = 3000.0 (rpm).
Example 6: Measurement of revolution frequency with a tachogenerator. The
relationship among the output frequency f of a tachogenerator with N poles and its shaft
revolution frequency f
f in Hz
f in rpm
For a 0 to 500 Hz signal operation range from a tachogenerator with 8 poles and
0 to 7500 rpm (= 120 × 500 / 8)
Lim High = 500 (Hz),
Eng High = 07500 (rpm).
Example 7: Flow measurement with use of a magnetic pickup sensor in order to
detect the passing blades of a turbine set in motion by the fluid. The flow is determined
by the sensor pulse frequency f and by the number of pulses per volume of fluid passing
through the turbine, N / V (in pulses/liter or pulses/m
f in Hz
f in rpm
For a 0 to 10000Hz operation range from the magnetic pickup, a rate of 100
3
pulses per 5 m
of fluid and 0 to 500.0 m
input as: Lim Low = 0, Lim High = 10000 (Hz), DC.PT = 8888.8 (one decimal place),
Eng Low = 0.0 and Eng High = 0500.0 (m
f
in Hz
R
f
= f / N
R
= f / (60 × N)
f
R
is given by:
R
f
in Hz
R
= 2 × f / N
f
R
= f / (30 × N)
f
R
indication,
DC.PT = 88888
flow in Volume/s
flow = f × (V / N)
flow = f × (V / N) / 60
DMY-2030-F / DMY-2030-F Light
f
R
DC.PT = 8888.8
= 120 × f / N
f
R
f
R
configure
the
(no
decimal
point),
3
, for instance):
flow in Volume/min
flow = 60 × f × (V / N)
flow = f × (V / N)
/s (= 10000 × 5 / 100) indication, configure the
3
3
/s).
f
in rpm
R
= 60 × f / N
f
= f / N
R
(one
decimal
f
in rpm
R
= 2 × f / N
input
as:
Lim Low = 0,
Eng Low = 0
Operation
Page 19
place),
and
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