SG1000D general description
The SG1000D is a Damper-valve Monitor with a 4-20 mA
output. The SG1000D is a rugged, medium cost encoder-based
monitoring device that enables the end-user to very accurately
monitor a damper-valve’s position, allowing very accurate
operations. The SG1000D has two modes: calibration mode,
and normal operating mode. A simple calibration procedure
teaches (programs) the SG1000D the fully-closed (0% open) and
fully-open (100% open) valve positions. Once programmed,
the SG1000D outputs a 4 mA DC signal when the valve is in the
fully-closed position, and outputs a 20 mA DC signal when the
valve is in the fully-open position. Any valve position between
fully-closed and fully-open, is represented by the output signal
being proportionally between 4 and 20 mA.
Physical Appearance and Installation Overview
Figure 1 is the front-view of the SG1000D, showing the encoder-
output-shaft.
Encoder-Shaft
3/8"-16 UNC-2A threads
3/8" Split Lockwasher
(Washer Shipped with
Stabilizer Bracket Kit)
Cable
Figure 1:
The SG1000D attaches to the damper-valve’s shaft, or similar
rotating mechanical component, using an “end-of-shaft”
mounting method. See Figure 2. The SG1000D’s encoder-
shaft-end screws into a single 3/8-inch diameter hole, to a depth
of 0.625 inch, having 3/8” – 16 UNC-2B threads. (Install 3/8”
split lockwasher, apply thread locker compound, and tighten to
8 ft-lb).
Even though the SG1000D is mounted to the process shaft via
the “end-of-shaft” mounting method, installation of flexible
conduit and the stabilizer bracket is recommended, which
allows the SG1000D to “float” along with any wobble of the
process’s shaft while still preventing the SG1000D from rotating
along with that shaft (see Fig. 2).
Note:
The stabilizer bracket’s U-bolt is slightly oversized
to provide about 1/8” of slack between it and the
SG1000D. The U-bolt’s slack prevents it from
rigidly clamping to the SG1000D’s conduit port.
Process Shaft
SG1000
Stabilizer bracket
U-Bolt
with slack
Structural Framework
Flexible
conduit
Figure 2:
Electrical connections
The SG1000D’s electrical cable has three wires, plus a shield-
wire. Connect as follows: (See Figure 3):
Requires
User Installed
Class 2 Isolated
+24Vdc
Power Supply
(
-
)
(+)
PLC, Etc.
SG1000
-
+
Clear 4-20mA
4-20mA
Shield
Red
Black
250 to 500
ohm load
Ammeter
(optional)
Figure 3:
• Connect the shield wire to the earth ground.
• Connect the black wire to the power-supply (-) terminal.
• Connect the red wire to the power-supply (+24 Vdc)
terminal.
• Connect the clear wire to a resistive load of 250 Ω to
500 Ω, (usually this load is internal to a PLC, etc.).
Note:
The clear wire is the 4-20 mA DC output line.
The other side of the 250 Ω to 500 Ω load must be
connected to the power-supply (-) terminal.
• See Figure 4 below for related information.
Calibration Procedure
Calibration consists of teaching the SG1000D the encoder
values for the fully-closed (0% open) and fully-open (100%
open) positions. The eight calibration steps are as follows (once
the user is familiar with the calibration procedure they need only
follow the
underlined
portions as a quick calibration guide):
1) Remove (twist CCW) the back-end-cover from the
SG1000D.
This provides access to the edge of the SG1000D’s printed
circuit board, namely the direction switch SW1 (the slide
switch), and the calibration switch SW2 (the push-button
switch). See Figure 4 for locations of these switches.
Shield
Black
Clear
Red
CCW
CW
R8
SW1 Detail
CW(OFF)
CCW(ON)
SW2
SW1
R7
TB1
Ground
Screw
Figure 4:
SG1000D Damper-Valve Position Monitor
6111 Blue Circle Drive
Minnetonka, MN 55343
Phone: 952.930.0100
Fax: 952.930.0130
ISO 9001:2000 Certified
Free Catalog and Application Assistance
1.800.328.6170
Visit Us Online
www.electro-sensors.com
990-002430 Revision F