Dwyer LCT216 - Manual (Page 14)

Page 14
TACHOMETER SETTINGS
Parameter Configuration
PV
SV
FUnC tACH Sets the controller to function as a tachometer.
tAotmd Tachometer Output Mode determines the output condition when the
process value exceeds the set point value. See output mode charts
below for more information.
C SPEd Maximum Input Frequency can be set from one count per second up
to 10,000 counts per second.
Point Sets the number of digits to the right of the decimal point on the
display.
PSCALE Pre-Scale is used when converting the process value’s units of
measure. This value is commonly used to convert the input
frequency (counts per second) to a rotational speed (rpm) using the
below equation.
Frequency (Hz) * Pre-Scale = Rotation Speed (rpm)
Pre-Scale = 60 / n (where n = number of pulses per
revolution).
St tAC Initial Power Up Interrupt delays the output from triggering for up to
99.9 seconds.
St AvG Input Filter allows the tachometer to average 2, 4, or 8 readings to
give a more stable reading. (1= 2 data points, 2 = 4 data points, and
3 = 8 data points).
rtSr Minimum Width of Reset Signal determines how long the
reset terminals must be engaged to reset the device.
inPtLC Input signal can be set for PNP or NPN. This parameter
determines which wiring diagram should be used.
Tachometer Output Mode Charts
OUT2 set value
Measurement value
OUT1 set value
OUT1
OUT2
OUT1 set value : OUT1 ON
Measurement value OUT2 set value : OUT2 ON
(LO-LO)
OUT2 set value
Measurement value
OUT1 set value
OUT1
OUT2
Measurement value OUT1 set value : OUT1 ON
Measurement value OUT2 set value : OUT2 ON
(LO-HI)
OUT2 set value
Measurement value
OUT1 set value
OUT1
OUT2
(HI-LO)
Measurement value OUT1 set value : OUT1 ON
Measurement value OUT2 set value : OUT2 ON
OUT2 set value
Measurement value
OUT1 set value
OUT1
OUT2
(HI-HI)
Measurement value OUT1 set value : OUT1 ON
Measurement value OUT2 set value : OUT2 ON