Signal Isolator/Converter
USER’S MANUAL
May 2016 N
SIX
o. 297-701-00 C
© 1991 by Moore Industries-International, Inc.
Table of Contents
Introduction 1
Description 1
Calibration 1
Installation 5
Operation 7
Maintenance 7
Troubleshooting 7
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48
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Page 1
SIX
Introduction
Moore Industries’ Signal Isolator/Converter (SIX) is a
DIN-style, loop-powered device, used to provide
complete isolation of instrumentation input and
output. This helps eliminate faulty readings in
measurement and control equipment caused by
ground loops, electrical interference, or motor noise.
This manual provides a brief description of the SIX, a
list of performance and functional specifications, a
calibration procedure, operations notes, and troubleshooting information.
Notes and Cautions, where they appear in text or
illustrations, are provided to assist the user in
avoiding operational inconveniences (Notes), or
practices that otherwise might result in damage to
the unit (Cautions).
Description
The SIX is loop-powered. When connected in a 1242 Vdc loop, it converts a standard process current
or voltage signal to a proportional, isolated 4-20 or
10-50 mA output; breaking the galvanic path between a transmitted signal source and its receiving
device.
The unit is packaged in a compact, DIN-style housing that snaps easily on to G-rail mounting hardware
(DIN EN50035). This makes it ideal for use in high
density installations.
Controls
Table 1 consists of the SIX performance and functional specifications.
Options
Units may be ordered with RFI-filtered terminals and
case assembly (RF Option). RF-equipped units
provide RFI/EMI protection up to 50V/M - abc =
±0.1% F.S., as defined by SAMA standard 33.1.
Contact your Sales Representative or Moore Industries for more information on available SIX options
and compatible devices.
Serial Number. A complete history of every unit
sold and serviced by Moore Industries is kept at the
factory. This data is keyed to each unit’s serial
number. If service data is required on an SIX,
providing the factory with the unit serial number will
allow our highly skilled technicians to better assist
you.
The SIX serial number is located on a label affixed to
the side panel of the unit.
Model Number. Moore Industries' model numbers
identify the type of instrument, functional characteristics, operating parameters, any options ordered,
and housing type. If all accompanying documentation for a unit is missing, the model number may be
used to obtain technical information.
The model number for the SIX is located on the
same label as its serial number.
The example following Table 1 is provided to assist
in deciphering the fields of the SIX model number.
The SIX has Zero and Span potentiometers located
on the front panel of the unit. On older units these
were labeled:
for Zero, and
for Span.
On newer the words “ZERO” and “SPAN” may be
used to identify the potentiometers.
Calibration
Prior to unit shipment, each SIX is calibrated and
tested according to Moore Industries’ strict quality
control guidelines. It is recommended, however, that
a bench check of potentiometer settings and output
levels be performed before placing the SIX into
service.
Page 2
SIX
Table 1. SIX Specifications
Characteristics
Input
Output
Power
Performance
Adjustability
Environmental
Ratings
Specifications
Factory-set. Available ranges are:
0 to 20 mA
4 to 20 mA
–1 to +1 mA
0 to 10 V
1 to 5 V
0 to 1 V
Factory-set. 4 to 20, or 10 to 50 mA.
2-wire loop-power; 12 to 42 Vdc.
Isolation: Input and output are transformer-isolated with no galvanic path (dc connection)
up to 500 Vrms.
Frequency Response: 10 Hz at the 3 dB point.
Maximum Input Over-range: ±60 V
Input Impedance: 1.0 Mohm for voltage inputs; 50ohms for 4-20 mA input;
1 kohm for –1 to +1 mA input.
Load Capability: 4-20 mA into 1500ohms; limited to 50 mA, maximum.
Power Supply Effect: Less than 0.05% of span over the full power supply range.
Calibration Accuracy: ±0.1% of span.
Zero potentiometer adjusts unit zero to within ±5% of span.
Span potentiometer allows for 100% adjustment, ±10%, with full-scale input.
RFI/EMI Effect: Without RF Option, effect is negligible @ 25 V/m at typical communications frequencies. With RF, protection of 50 V/m-abc = ±0.1% F.S., as defined by SAMA
Standard 33.1.
Ambient Operating Temperature Range: –30 to +82 °C (–22 to +180 °F).
Temperature Change Effect on Unit Operation: 0.015% of span per °C change over a
0 to 70 °C range.
Weight
Approximately 215 grams (7.6 ounces).
NOTE: Refer to Installation Section of this manual for unit dimensions.
Calibration Equipment
Table 2 lists the calibration equipment required for this
bench check procedure. This equipment is not
supplied with the unit.
Calibration Setup
Figure 1 shows the calibration setup for the SIX. To
check or calibrate the SIX, connect the unit as shown
in the illustration, and apply the power according
specification (refer to the specifications table and the
model number of your unit).
EXAMPLE
]
t
r
s
Unit Type
Inpu
Output
Powe
Option
Page 3
SIX
SIX / 4-20mA / 10-50mA / 12-42DC / -RF [DIN
Housing
Table 2. SIX Calibration Equipment
Equipment Characteristics
Signal Source Appropriate for the intended SIX application, accurate to within ±0.05% of span, minimum
DC milliammeter Fluke model 8899, or equivalent unit accurate to within ±0.05% of span, minimum.
or
DC voltmeter with
Precision resistor
Power Supply Capable of 12 to 42 Vdc.
Screwdriver Slotted head, width 2.54 mm (0.1 inch).
Voltmeter accurate to within ±0.05% of span, minimum.
Resistor: 250ohm (±0.1%), rated for 4-20 mA.
Page 4
–
+
–
)
SIX
MILLIAMMETER
+
SIGNAL
SOURCE
–
NOTE: Either milliammeter or voltmeter may be used for monitoring output.
Note that there are no internal adjustments or settings
to effect on the SIX. Disassembly of any kind is not
recommended.
After applying power, allow approximately five minutes for stabilization/warm-up.
IN
IN
+ PS
SIX
PS
Figure 1. SIX Calibration Setup
Calibration Procedures
There are two options for monitoring the output of the
SIX shown in the figures; either a dc milliammeter or
a dc voltmeter with load resistor may be used to
monitor and set output levels.
1. With the calibration setup complete, adjust both
potentiometers 15 turns counterclockwise, then
7.5 turns clockwise (mid-scale).
2. Simulate zero percent input.
–
+
+
12-42 Vdc
(SEE NOTE
POWER
SOUCE
–
+
VOLTMETER
3. Adjust zero potentiometer until milliammeter
4. Set input to 100 percent.
5. Adjust span potentiometer until milliammeter
6. Repeat steps 2 through 5 until zero and 100
–
reads 4 mA for 4-20 mA units, 10 mA for
10-50 mA units, or until voltmeter reads 1 volt.
CAUTION
To avoid damaging the housings, use a
screwdriver with a head not wider than
2.54 mm (0.1 inch) to adjust the zero and
span potentiometers.
reads 20 mA for 4-20 mA units, 50 mA for
10-50 mA units, or until voltmeter reads 5 volts.
percent readings are stable, ±0.1%.
Page 5
m
SIX
Installation
In this manual, the installation of the SIX is divided
into two phases: physically mounting the unit, and
making the electrical connections. It is recommended that the unit(s) be mounted before making
any connections.
Mounting
When mounting the SIX, make every effort to install it
in an area that is relatively free of dust, moisture, and
corrosive materials.
Figure 2 shows the mounting dimensions for the SIX.
25.40 m
(1.0 in)
To mount the unit on a DIN-style G-rail, insert the
metal clip on the unit’s back panel under the top lip of
the rail. Pivoting on the clip, press down firmly until
the SIX snaps into place.
If it becomes necessary to remove the unit, grasp the
bottom of its front panel and lift upward.
NOTE
The SIX has no case ground connection.
If possible, avoid mounting the unit in any
electrical field. Secure the case to a
good conductor at zero potential.
119 mm
(4.67 in)
80 mm
(3.15 in)
+IN
SIX
-IN +PS
SIGNAL
ISOLATOR
SPAN
ZERO
-PS
Figure 2. SIX Outline Dimensions
Page 6
SIX
Electrical Connections
The SIX has four terminals on its front panel. They
are labeled “+IN” and “–IN” for connection of the
signal input, and “+PS” and “–PS” for connection of
the unit’s output.
Figure 3 illustrates the connection of the SIX in a
generic application.
Figure 4 shows the unit connected in another typical
operational scenario.
+ IN + PS
FIELD SERVICE
(NON-ISOLATED
TRANSMITTER)
SIX
– IN – PS
To complete these connections, use a small, slotted
screwdriver to loosen the SIX terminal screws, and
slip the appropriate stripped wire end into the terminal
hole. Tighten the terminal screw.
Both the input and output may be grounded. The SIX
input and output are transformer-isolated with no dc
connection between them. This isolation provides 67
dB common mode rejection, and allows the input to
float with respect to the output.
12-42 Vdc
POWER SOURCE
+–
(ISOLATED 4-20 or 10-50 mA SIGNAL)
–
RECEIVER
+
Figure 3. SIX Typical Installation Hookup
TRANSMITTER
Page 7
SIX
+
1-5 Vdc
DCS
–
–IN +IN
SIX
–PS +PS
Figure 4. SIX Installed as a Repeater/Diverter
Operation
Once mounted and connected according to the
instructions, the SIX operates unattended. After the
initial calibration of the Zero and Span potentiometers, no further adjustment is required.
Maintenance
A check of terminal connections is recommended
every six months. Ensure that all terminal screws are
tight and free of corrosion. Check that adequate
ventilation exists, or that heat sinking materials are
used in mounting.
POWER
–+
–
RECORDER
+
Troubleshooting
If the SIX is found to be performing below specification, complete the following checklist:
1. Make sure all connections are clean and tight.
2. Verify the accuracy and calibration of bench
instruments used to take measurements.
3. Ensure that signal and power levels in the
instrumentation loop have not changed since the
unit was installed. Make sure that power is
within specified limits (refer to table 1).
If problems persist, note the serial and model numbers of the offending unit, and contact Moore Industries’ Customer Service Department. Instructions for
return of Moore Industries equipment are on the back
cover of this manual.
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