Moore Industries SCX User manual

SYI
Demand Moore Reliability
All product names are registered trademarks of their
respective companies.
User’s Manual
SCX
Signal Isolator and Converter (2-Wire)
No. 109-701-00F
July 2019

Customer Support
Moore Industries is recognized as the industry leader in delivering top quality to its customers in products
and services. We perform a sequence of stringent quality assurance checks on every unit we ship. If any
Moore Industries product fails to perform up to rated specications, call us for help. Our highly skilled sta󰀨 of
trained technicians and engineers pride themselves on their ability to provide timely, accurate, and practical
answers to your process instrumentation questions. Our headquarters and other facilities phone numbers
are listed below.
There are several pieces of information that can be gathered before you call the factory that will help our
sta󰀨 get the answers you need in the shortest time possible. For fastest service, gather the complete model
and serial number(s) of the problem unit(s) and the job number of the original sale.
www.miinet.com
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Locations
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Ask for the STAR Center
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4
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9
9
Table of Contents Introduction
Description
Calibration
Installation
Recommended Ground Wiring Practices
CE Conformity
Installation in Hazardous Locations
Specific Conditions of Use
Maintenance
9
10
13
8

Page 4
SCX
Options
The SCX is available with the following options:
RF Option — RFI and EMI protection to 50 V/m –
abc -0.1% of full-scale when tested according to
SAMA standard PMC 33.1 (not available for ECD
Housings).
RTB Option — Removable terminal block for DIN-
style units only.
WTD Option — Water-tight enclosure for ECD
housed units meeting NEMA 4 and SAA Type N
(IP65) requirements.
For information on availability of other SCX options,
contact your local Moore Industries’ Sales Represen-
tative.
Serial/Model Number. Moore Industries uses a
serial number-based tracking system to maintain
historical records on each individual product that we
sell or service. The model number contains impor-
tant configuration information about the product to
which it corresponds. Together, the serial and model
numbers provide the factory, and the user, with
information regarding the unit’s history and functional
configuration.
If service information is required, you must provide
the factory with the unit’s serial number. Providing
the model number is also important when technical
assistance is required. The serial and model num-
bers for PC units is etched into a stainless steel tag
on the front of the unit. For DIN-style and ECD units,
these numbers are printed on a label and affixed to
the side of each unit.
The model number contains information about the
configuration of the unit as it was shipped from the
factory. The following model number example
identifies the significance of each field of the SCX
model number.
Introduction
Moore Industries’ Signal Current Isolator (SCX) is a
process instrument that accepts a process variable
current input and provides an isolated current output.
This manual contains descriptive, calibration, and
installation information for the SCX. Notes are
presented in this manual to help you avoid minor
inconveniences while calibrating or installing this
instrument.
Description
The SCX accepts a 4-20 or 10-50 milliampere (mA)
input and outputs a proportional, isolated process
variable signal of the same value. Units with 10-50
mA inputs can be factory-configured to output 4-20
mA (not with ECD Housings). Units configured with
4-20 mA inputs have 4-20 mA outputs only. The
input and output are factory configured to user
specifications.
Power requirements for the SCX vary depending on
the combined input/output configuration of the unit.
Table 1 listed the voltage drops (requirements)
considerations for the SCX.
The SCX has no visual indicators, but does have one
adjustment; the TRIM potentiometer (pot). The TRIM
pot is located on the front panel and is used to adjust
the output signal for a precise span value.
The SCX is available in three basic housing styles;
the hockey-puck (HP), DIN-style, and economy DIN-
style (ECD). Functionally they are identical. The
housing style you select should be based on the
application and the environment in which the unit is
to be used.
Table 1 contains the operational and performance
specifications of the SCX.

Page 5
SCX
Specifications
4-20 mA, into 275ý
10-50 mA, into 150ý
4-20 mA, into 0-250ý
10-50 mA, into 0-100ý
Supplied as input, loop excitation:
5.5 V loop power, for 4-20 mA input and output
8.5 V loop power, for 10-50 mA input and output
4.5 V loop power, for 10-50 mA input and 4-20 mA output
(Power requirements listed are the voltage drops caused by the SCX
alone.)
Multiturn potentiometer, front panel
Trim: Adjusts output to ±1% of span accuracy
Accuracy: ±0.075% of span
Isolation: Input and output are transformer isolated to 500 Vrms, no dc
connections
Temperature Affect: ±0.018%/°C (±0.01%/°F) per degree change;
±0.005% per degree gain change
Ambient Operating Temperature: –29 to 82 °C (–20 to 180 °F)
Charateristic
Input
Output
Power
Controls
Performance
Environmental
Ratings
Table 1. SCX Operational and Performance Specifications
NOTE: Refer to the Installation Section of this manual for the unit’s outline dimensions.
SCX / 4-20MA / 4-20MA / 5.5VLP / -RF [HP]
Unit Type
Input
Output
Power
Option(s)
Housing
MODEL NUMBER
EXAMPLE

Page 6
SCX
Calibration
Every SCX is calibrated and tested at the factory
prior to shipment. Before placing an SCX into
service, you should set it up for a bench check and
verify that it responds to known inputs in a predict-
able manner. A bench check will indicate if the SCX
is ready to be placed into service or if it needs to be
re-calibrated. To bench check and calibrate an SCX
properly, your must use test equipment that allows
you to vary the input and monitor the output. The
equipment and setup requirements are described in
the Calibration Setup subsection later in this section.
SCX Controls
The SCX has one control; the Trim pot. This potenti-
ometer is located on the front panel (all housing
styles) and is labeled “TRIM”. This adjustment
changes the gain of the output span. This single
adjustment varies the zero- and 100-percent output
values equally so that you can adjust the signal to
have the same amount of offset at both extremes.
With the Trim adjustment you can set the 16 mA
span for 4-20 mA outputs with very high precision.
The same is true for the 40 mA span of the 10-50 mA
outputs.
Calibration Setup
Since the SCX has no visual indicators, its opera-
tional performance must be verified with calibration
equipment. The equipment required to bench check
and calibrate the SCX is listed in table 2. The
accuracy of the equipment used is very important. If
uncalibrated test equipment is used, the input you
apply and output readings you observe will be
unreliable, and the actual performance of the SCX
unpredictable.
Although the SCX can be calibrated in its installation
location, typically it is easier to work with the calibra-
tion equipment in a laboratory setting (e.g., a techni-
cians workbench).
Figure 1 illustrates the hookup requirements for
bench check and calibration of the SCX. The
terminal designations for each connection are clearly
marked on the front panel of each unit. The SCX
uses four terminals; +IN and –IN for the input signal
and +OUT and –OUT for the isolated output signal.
All housing styles use a compression-screw principle
to make individual wire connections. HP and ECD
housed units provide wire access through the top
and bottom of the terminal locations with compres-
sion screws accessed at the front of the unit. For
standard DIN-style units the wire and screw access
are both on the same plane (i.e., the front surface) of
the unit.
Table 2. SCX Calibration Equipment
Equipment
Adjustable Current
Source
Voltmeter & Load
Resistor
Milliammeter
Screwdriver
Characteristics
Capable of simulating specified input range (4-20 or 10-50 mA)
and voltage requirements (see table 1)
Voltmeter, accuracy of 0.05% or better; Load resistor, 250ý for 4-
20 mA output, 100ý for 10-50 mA output, tolerance of ±0.02%
Accuracy of 0.05% or better
Slotted-tip, head width no greater than 2.54 mm (0.1 inch)

Page 7
SCX
Figure 1. SCX Calibration Hookup
Calibration Procedure
Before beginning this procedure, check the model
number of the unit to be calibrated to verify the
power requirement of the unit and what the input and
output are configured for. The following procedure is
suitable for all SCX’s.
Refer to table 2 for a list of calibration equipment and
use figure 1 for hookup requirements.
1. Connect SCX and calibration equipment as
shown in figure 1.
2. Apply power and allow SCX to warm-up for 5
minutes.
3. Set adjustable input source for median input
based on input configuration (12 mA for 4-20 mA
input; 30 mA for 10-50 mA input).
4. Monitor output with voltmeter to verify propor-
tional output reading is present (3 Vdc).
NOTE
If your unit is configured for 10-50 mA
input and 4-20 mA output, an input of 30
mA should produce an output reading 12
mA (3 Vdc).
5. Adjust TRIM pot, as required, to bring the
median output reading to match the (appropriate)
median input.
6. Set adjustable input source for zero-percent
input as stated in model number.
7. Verify zero-percent output (1 Vdc, ±3 mV)
corresponds to zero-percent input.
8. Set adjustable input source for 100-percent input
as stated in model number.
9. Verify 100-percent output (5 Vdc, ±3 mV) corre-
sponds to 100-percent input.
10. If zero- or 100-percent output reading do not
correspond to appropriate inputs, repeats steps 3
through 9.
11. When output readings are stable and consistent,
remove power and disconnect calibration equip-
ment. Calibration is complete.
If you have difficulty performing the calibration
procedure, contact Moore Industries’ Customer
Service Department for assistance.
SCX DC
VOLTMETER
(SEE NOTE 1)
(SEE NOTE 2)
+OUT
–OUT
+
–
NOTES: 1.
2. Check unit's model number for input and output configuration. For a 1-5 Vdc reading, use a 250 resistor for 4-20 mA
outputs or a 100 resistor for 10-50 mA output.
ADJUSTABLE
CURRENT
SOURCE
MILLIAMMETER
+IN
+
––IN
+–

Page
Installation
Installing the SCX consists of physically mounting
the unit and completing the necessary electrical
connections. Before installing the SCX, you should
check its model number and bench check it to
ensure it is properly configured for the intended
application.
Installation is generally made easier by mounting the
unit before making the electrical connections.
Mounting the SCX
The SCX is available in three basic housing styles.
Regardless of the housing style chosen, mounting
the SCX in an area free of excessive dust, moisture,
or corrosive elements will prolong the life of the unit.
The HP Housing. The HP Housing is designed to
mount inside explosion-proof enclosures. Spring
clips on the basic HP Housing are used to hold the
unit in the base of the enclosure. By squeezing the
ends of the spring clips toward one another, the unit
can be positioned in the base. When released, the
spring clips apply adequate outward pressure to hold
the HP unit in the enclosure. If the basic HP Housing
is equipped with flange plates (FL Housing), it can be
mounted on flat surfaces or relay tracks. Figure 2 is
an outline dimension drawing of the HP Housing.
The spring clips have no dimensional significance so
they are not shown, but the flange plates do (see
figure 2).
The DIN-style Housing. The DIN-style Housing is
designed to mount directly on standard G-type
(EN50035) or Top-hat (EN50022) DIN rails. At the
rear of this unit are the lips and grooves for mounting
on a rail. This unit is mounted by positioning it so
that the upper portion of the DIN-rail mating elements
hook either under or over (depending on the rail
type) the top of the rail, then, rotate the front of the
unit downward. Figure 3 is an outline dimension
drawing of the DIN-style SCX.
The ECD Housing. The ECD Housing is a plastic
DIN-style housing. This housing mounts on the G-
type and Top-hat DIN rails in the same manner as
the DIN-style Housing. Figure 4 is an outline dimen-
sion drawing of the ECD Housing.
Figure 2. HP Housing Outline Dimensions (FL Housing shown)
62.2 mm
(2.45 in)
55 mm
(2.17 in)
49 mm
(1.92 in)
82.5 mm
(3.25 in)
72.6 mm
(2.86 in)
61 mm
(2.40 in)
75.4 mm
(2.97 in)
38 mm
(1.50 in)
+OUT –OUT
TRIM
GND
SIGNAL
CURRENT ISOLATOR
1 3 5
2 4 6
+IN –IN

Recommended Ground Wiring Practices
Moore Industries recommends the following ground wiring practices:
•Moore Industries product in a metal case or housing should be grounded.
•The protective earth conductor must be connected to a system safety earth ground before
making other connections.
•All input signals to, and output signals from, Moore Industries’ products should be wired using a
shielded, twisted pair wiring technique. Shields should be connected to an earth or safety
ground.
•For the best shielding, the shield should be run all the way from the signal source to the
receiving device (see note below).
•The maximum length of unshielded input and output signal wiring should be 2 inches.
Note: Some of Moore Industries’ instruments can be classified as receivers (IPT2, IPX2, etc.) and
some can be classified as transmitters (TRX, TRY, etc.) while some are both a receiver and a transmitter
(SPA2, HIM, etc.). Hence, your shield ground connections should be appropriate for the type of signal
line being shielded. The shield should be grounded at the receiver and not at the signal source.
CE Conformity
Installation of Moore Industries’ products that carry CE marking must adhere to the guidelines in the
Recommended Ground Wiring Practices section in order to meet the requirements in EN 61326 and the
relevant EMC directive.
Installation in Hazardous Locations
This section contains important information regarding installation of the MIX 2 wire 4 channel in
Hazardous Area locations.
NOTE The SCX is suitable for Class I Division 2, Groups A-D or General Locations only.
WARNING Do not disconnect equipment when a flammable or combustible atmosphere is present.
AVERTISSEMENT Risque d’explosion. Ne pas débrancher tant que le circuit est sous tension, à moins
qu’il ne s’agisse d’un emplacement non dangereux.
AVERTISSEMENT Risque d’explosion. La substitution de composants peut render ce materiel
inacceptable pour les emplacements de Classe I, Division 2.
Page 9
SCX

Specific Conditions of Use
The following instructions must be adhered to when the SCX is used in hazardous locations and
potentially explosive atmospheres.
The SCX shall be installed in compliance with the enclosure, mounting, spacing and segregation
requirements of the ultimate application.
cULus Installation
Nonincendive Applications
Class I, Division 2, Groups A-D
The SCX DIN shall be installed into an enclosure that utilizes a tool removable door or cover.
cFMus Installation
Nonincendive Applications
Class I, Division 2, Groups A-D
The SCX DIN shall be installed into an enclosure that utilizes a tool removable door or cover.
Page 10
SCX