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990-007000 Revision A
5-6
button. (This is referred to as “on-the-fly” entry into Calibration
Mode). (Technically, at this point for on-the-fly” entry into
Calibration Mode, the old calibration does NOT get wiped-out
until the new calibration points have been acquired).
See the “
Calibration Procedure
” section for complete details.
SG1000RA General Specifications:
Input Power
Input Current
115 - 230VAC
±10% 50/60Hz
60 mA for internal electronics
(but if supplying Vac to the output relays then
allow for a maximum of 0.5 A @115Vac,
or 0.25 A @ 230 Vac,
for each of the two relays
)
Input Signal
Parameters
Type
Rotating shaft connected to internal 10 bit, 0
to 1023 count, absolute position magnetic-field
encoder
Range of Operation
Continuous rotation with no physical end stops.
Calibratable span of 1/4 to 6 turns of output
shaft. Output shaft max RPM = 200.
Internal Gear Ratio 6:1
Output
Parameters
Relay
Outputs
Two Form C Relays, w/programmable set-points:
(Relay1 @ user’s fully-closed position).
(Relay2 @ user’s fully-open position).
Relay
Ratings
(Resistive
Loads
Only)
125Vac @ 0.5A,
250Vac @ 0.25A,
30Vdc @ 0.5A,
110Vdc @ 0.3 A, and
220Vdc @ 0.27 A.
Accuracy
The internal magnetic-field encoder has a
Nominal accuracy of +/- 0.7°-turn, and a
Worst case accuracy of +/- 1.4°-turn,
of its internal shaft.
After going through the 6:1 gear-ratio inside of the
SG1000RA, this results in a
Nominal accuracy of +/- 4.2°-turn, and a
Worst case accuracy of +/- 8.4°-turn,
of the SG1000RA’s output shaft.
Encoder
Resolution
The SG1000RA
resolves down to 2 encoder counts of
the user’s calibrated span
(span from fully-closed to
fully-open). This means the resolution varies linearly
from best of 0.2% of span, to worst of 5.0% of span,
depending on calibration (see details down below).
Note
: The internal encoder resolves down to 1 count
of the user’s calibrated span. However the SG1000RA
software uses a +/- 1 count anti-jitter-filter, resulting in
more stable operation but at the expense of resolution,
for a final resolution of 2 counts of the user’s calibrated
span.
Note
: The SG1000RA software also monitors
a long-term trend, so if no jitter is present then a
resolution of 1 count of the user’s calibrated span may be
achieved (but is not guaranteed).
Resolution details as per the calibrated span:
A
0.2% resolution
occurs when the application can make full use of
the 6-turn maximum capability of the SG1000RA, and in such a case
calibration is done at the maximum span of 1024 encoder counts.
That is, 1 count out of 1024 counts is about 0.001, or 0.1 %, but after
running through the SG1000RA’s anti-jitter-filter becomes 2 counts
out of 1024 counts, which is about 0.002 = 0.2%.
A
5.0% resolution
occurs when calibrated at the minimum span of 43
encoder counts, which is 1/4th-turn of the output shaft. Allowing for
the +/- 1 count anti-jitter-filter, a 1 count out of 43 counts becomes 2
out of 43, which is about 0.05, or 5 %.
At temperatures -20F (-29C) and colder, the SG1000RA (relays
specifically) may be unstable for a few seconds during a ‘cold-start’
power-up if the it has been sitting in the cold unpowered for awhile.
Mechanical
Parameters
Mounting
End of Shaft, single drilled and tapped hole.
Mounting Threads
3/8-16 UNC x 0.625 in.
(Other options available.)
Housing Material
Cast Aluminum
Housing Dimensions
Cylindrical, with diameter of 3-11/16”, length
of 7-5/8” (length includes housing & shaft)
Stabilizer Bracket
Mounted semi-rigidly to application’s
framework using two user supplied 5/16”
bolts.
Terminal Block
Torque
0.35Nm to 0.4Nm
3.10in-lb to 3.54in-lb
Physical/Enviroment
Parameters
Class I, Groups C, D
Class II, Groups E, F, G
UL File: E249019
For use in Pollution Degree 2 Environments.
Additional Rating
NEMA 4X, Gasket Provided
Temperature Range
-40ºC to +65ºC (-40ºF to +149ºF)
Humidity
0% to 90% non-condensing
Operator Interface
Parameters
One Pushbutton
Enter Calibration Mode, and calibrate for
fully closed/fully open positions
One Rotary Switch
Select relay set-point hysteresis
Memory
EEPROM retains calibration during power
failure or power shut down
Operation Modes
Normal Operating Mode:
(output relays per gate position)
.
- Output: Energize/de-energize two relays as per gate position, for a
properly calibrated SG1000R.
- Output: Both relays remain de-energized for an uncalibrated or
mis-calibrated SG1000R.
Calibration Mode:
(calibrate for fully-closed / fully-open gate
positions, and select Relay set-point and hysteresis)
.
- Output: Both relays remain de-energized in this mode.
Additional Information
To get additional information about the SG1000RA, visit our
website at: www.electro-sensors.com
Notice:
Copyright © 2018 Electro-Sensors, Inc. All rights reserved. No part
of this document can be duplicated or distributed without the express
written permission of Electro-Sensors, Inc.
