DYNAPAR SimTach A STAE0 Technisches Handbuch - Seite 2

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OPERATION
Input Range Selection
The input signal is applied to a precision resistor voltage
divider network which scales the signal down to the 2
VDC internal range. The 20, 200 and 600 volt range
switches provide +10, +100 and + 1000 selections.
Gain Adjust Pot (ST AxO)
The potentiometer and amplifier provide gain adjustment
to calibrate the display to readout in engineering units.
Digital Calibrator (STAx1)
The divided input is routed through a digital-to-analog
converter (DAC) , which multiplies the signal by the scale
factor set on the BCD switches as O.XXX . (Note that a
setting of 0.000
=
Calibration of 1.)
Analog-to-Digital Converter
The ADC uses dual-slope conversion and auto-zero
circuitry to povide a full 4-1/2 digit range. A selectable
clock source allows fast or slow display updates to meet
differing application requirements.
LED Display
The 4-1/2 digit povides a sign for inputs that range below
zero, and selectable decimal point displays.
APPLICATIONS
Actual Speed Indicator
Using DC Tach Feedback
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DC Drive
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OCT,,,,
Motor
DC Tachometer Feedback
SimTach A
To provide a calibrated speed readout of motor RPM, a
DC tachometer with a1 0 volt-per-thousand RPM output
is mounted to the motor. The maximum motor speed is
7200 RPM, for which the tachometer will generate an
output of 72 volts DC.
The 200 VDC input range is selected; no decimal point
display is chosen for RPM readout. The display will read:
72 volts input
x 20,000 max. display
=
7200
200 volt range
No adjustment of the gain adjust pot is needed (factory
set for gain of 1).
Vin
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RANGE
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20 VOLT
'00 VOLT
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OPTIONAL DIGITAL CALIBRATOR
SlmTach A Block Diagram
Actual Speed Indicator
Using Motor Armature Voltage
+
Armature
Motor
Armature Voltage Feedback
ANALOG TO
DIGITAL
CONVERTER
SimTach A
fAST
An 480 volt DC motor is driving a conveyor at a maximum
speed of 360 inches per minute.
The 600 VDC range is needed, and a
.x
decimal point
display is selected. With no calibration, the display is:
480 volts input
x 20,000 max. display
=
480.0
2000 volt range
The calibrator is calculated by the folrmula:
360.0 desired
=
0.750
480.0 expected
The BCD switches are set to 0.750 to calibrate the unit.