Acromag microBlox Series User manual

microBlox® Series
Model uBTA-H-1MR, uBTA-H-1SR, and uBTX-H-1
DIN Rail Transmitter/Alarm Carriers for Bluetooth® Wireless
Technology microBlox® Input Modules
USER’S MANUAL
ACROMAG INCORPORATED Tel: [phone]
30765 South Wixom Road Fax: [phone]
Wixom, MI 48393-2417 U.S.A. email: [email protected]
Copyright 2018, Acromag, Inc., Printed in the USA.
Data and specifications are subject to change without notice. 8501079B
retired

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 2 -
http://www.acromag.com
- 2 -
https://www.acromag.com
TABLE OF CONTENTS
GETTING STARTED ............................................................................................ 3
Description ..........................................................................................................................3
Key Features........................................................................................................................5
Application ..........................................................................................................................6
Mechanical Dimensions .......................................................................................................6
DIN Rail Mounting & Removal..............................................................................................7
ELECTRICAL CONNECTIONS ............................................................................ 8
Isolation Barriers .................................................................................................................8
Power Connections..............................................................................................................9
Input Connections, BLE Jumper, and CJC Jumper ................................................................11
Earth Ground Connections .................................................................................................12
Interposing Relay Connections ...........................................................................................12
Add Contact Protection When Switching Inductive Loads ...................................................13
Transmitter Output Connections........................................................................................14
CONFIGURATION SOFTWARE...................................................................... 15
Quick Overview .................................................................................................................15
Optional Output Current Trim Adjustment .........................................................................16
TECHNICAL REFERENCE ................................................................................ 17
Block Diagram ...................................................................................................................17
How It Works.....................................................................................................................18
Alarm Operation................................................................................................................18
TROUBLESHOOTING....................................................................................... 19
Diagnostics Table...............................................................................................................19
Service & Repair Assistance ...............................................................................................20
ACCESSORIES .................................................................................................... 21
DIN Rail Bus Connector Kit .................................................................................................21
End Stops...........................................................................................................................21
SPECIFICATIONS .............................................................................................. 22
Model Number ..................................................................................................................22
Analog (Field) Input ...........................................................................................................22
Alarm Relay Outputs..........................................................................................................23
Transmitter Outputs ..........................................................................................................23
Controls.............................................................................................................................24
Alarm Configuration ..........................................................................................................25
Power................................................................................................................................26
Enclosure & Physical ..........................................................................................................27
Environmental ...................................................................................................................27

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 3 -
http://www.acromag.com
- 3 -
https://www.acromag.com
Agency Approvals ..............................................................................................................28
Reliability Prediction..........................................................................................................28
REVISION HISTORY ......................................................................................... 29
All trademarks are the property of their respective owners.
IMPORTANT SAFETY CONSIDERATIONS
You must consider the possible negative effects of power, wiring, component, sensor, or software failure in the design of
any control or monitoring system. This is very important where property loss or human life is involved. It is important
that you perform satisfactory overall system design and it is agreed between you and Acromag, this is your responsibility.
The information of this manual may change without notice. Acromag makes no warranty of any kind with respect to
this information, including, but not limited to, the implied warranties of merchantability and fitness for a specific
purpose. Further, Acromag assumes no responsibility for any errors that may appear in this manual and makes no
commitment to update, or keep current, the information contained in this manual. No part of this manual may be
copied, or reproduced in any form without the prior written consent of Acromag, Inc.
GETTING STARTED
Description
Symbols on equipment:
Means “Refer to User’s Manual
(this document) for additional
information”.
uBTA-H-1MR Combination Transmitter/Alarm Carrier for a single uB input
module with dual SPDT mechanical relays.
uBTX-H-1 A Transmitter-Only Carrier for a single uB input module with
both a 0-5V voltage output and a 0-20mA current output.
uBTA-H-1SR Combination Transmitter/Alarm Carrier for a single uB input
module with dual SPST AC/DC solid-state relays.
These carriers are used with Bluetooth wireless technology versions of Acromag
microBlox® modules to build powerful alarms and voltage/current transmitters
(input module not included, see below for compatible models). Modules are
isolated input-to-output and these carriers add power isolation and alarm
capability to the microBlox® module with two relays provided. A high or Low limit,
or a window alarm, may be configured for each relay via Bluetooth wireless
technology communication from your Android or iOS smartphone or tablet.
uB Input Models Supported (10/11 Bluetooth Wireless Technology Models)
Input Model
Module Input Limits
Module Output
uB31-B/uB41-B
±1V to ±60V
0-5V
uB30-B/uB40-B
±10mV to ±100mV
uB32-B/uB42-B
4-20mA/0-11.17mA DC
uB34-B/uB35-B
2/3/4-Wire Pt RTD
uB37-B/uB47-B
J/K/T/R/S Thermocouple
This microBlox® module carrier adds wide-input isolated power (including
redundant power capability), cold junction compensation for thermocouple
modules, dual isolated alarm relays, plus simultaneous voltage and current output,
and LED indication for Bluetooth wireless technology link, power, and each relay.
The microBlox® (uB) modules offer a flexible space-saving solution for isolating,
monitoring, and driving industrial process signals to interface with modern data
acquisition equipment. A single uB input module plugs into this carrier to build a
!

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 4 -
http://www.acromag.com
- 4 -
https://www.acromag.com
dual output alarm and voltage/current transmitter (uBTA models), or just a
voltage/current transmitter (uBTX model). Different input types can be plugged
into this carrier to form different alarm types, normally without recalibration. Like
all microBlox® components, these carriers offer high immunity in harsh industrial
environments, are CE and ATEX / IECEx compliant, and UL approved for installation
in Class I, Division II hazardous locations.

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 5 -
http://www.acromag.com
- 5 -
https://www.acromag.com
Key Features
•High-Density 22.5mm wide enclosure mounts on standard DIN rails and
includes pluggable, front-facing terminals. Front-panel LED indicators for
Bluetooth wireless technology link, power, and relays aide trouble-shooting.
•Field-pluggable microBlox® input modules (sold separately) allow you to
change input types on this carrier, usually without recalibration. Modules are
over-molded and RoHS compliant, and offer superior shock, moisture, and
dust protection.
•Channel has dual alarm outputs that is configured using Bluetooth wireless
technology. Two alarm carrier models are available—one with mechanical
relays (5A/250VAC/30VDC), one with solid-state relays (1A/200Vpk AC/DC).
•Free Bluetooth wireless technology Configuration App with Android™ or iOS™
support, no additional software required.
•16-character Password Protection for Bluetooth wireless technology access.
•Designed, hardened, and thoroughly tested for use in Harsh Environments.
•CE Approved & UL/cUL Class I, Division 2 Approvals.
•FCC Conformity Class B.
•ATEX / IECEx Certified for Explosive Atmospheres:
II 3 G Ex nA nC* IIC T4 Gc -40oC ≤Ta ≤+75oC (* for Model uBTA-H-1MR)
DEMKO 18 ATEX 2086X and IECEx UL 18.0092X
•Designed and manufactured for High Quality/High Reliability with AS9100
(Aerospace Quality)/ISO9001.
•Carrier includes both 0-5V/1-5V and 0-20mA/4-20mA transmitter outputs.
•Better than ±0.1% alarm and transmitter output accuracy.
•Wide ambient temperature operation from -40°C to +75°C.
•All I/O and power ports are transient protected.
•Wide-range DC powered from 6-32V and Bus Power Ready for optional clean
wired power along the DIN Rail and/or Redundant Power Connection.
•High 1500VAC Safety Isolation: Field input, transmitter output, power, and
relay contacts (including between contacts) are individually isolated for
common-mode voltages up to 250VAC, or 354V DC off DC power ground, on a
continuous basis (will withstand 1500VAC HIPOT/dielectric strength test for
one minute without breakdown). This complies with test requirements of
ANSI/ISA-82.01-1988 for voltage rating specified.
•High Shock & Vibration Immunity - Conforms to: IEC 60068-2-6: 10-500 Hz,
5G, 2 Hours/axis, for sinusoidal vibration; IEC 60068-2-64: 10-500 Hz, 5G-rms,
2 Hours/axis, for random vibration, and IEC 60068-2-27: 30G, 11ms half-sine,
18 shocks at 6 orientations and 50G, 3ms half-sine, 18 shocks at 6
orientations, for mechanical shock.
•EMC (Electromagnetic Compatibility) –Min Immunity per BS EN 61000-6-1
(2007); CE marked, per EMC Directive +
•2014/30/EU. Electrostatic Discharge Immunity (ESD), per IEC 61000-4-2;
Radiated Field Immunity (RFI), per IEC 61000-4-3 and ETSI EN 301 489;
Electrical Fast Transient Immunity (EFT), per IEC 61000-4-4; Surge Immunity,
per IEC 61000-4-5. Conducted RF Immunity (CRFI), per IEC 61000-4-6.
•Low Emissions - This is a Class B Product with Emissions per BS EN 61000-6-3
(2007+A1:2011) and Spurious Emissions per ETSI EN 300 328. Enclosure Port,
per CISPR 16. Low Voltage AC Mains Port, per CISPR 16.
•Installation Category - Suitable for installation in a Pollution Degree 2
environment with an Installation Category (Over-voltage Category) II rating
per IEC 1010-1 (1990).

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 6 -
http://www.acromag.com
- 6 -
https://www.acromag.com
Application
This carrier allows a single Bluetooth-enabled microBlox® input module to be
plugged into its housing as shown at left and mounted on a T-type DIN rail. Carriers
can mount side-by-side on 22.5mm centers and can also plug-together for modular
expansion with a shared input power connection along the DIN rail. These alarm
carriers support ten of eleven available uBxx-B input model types with Bluetooth
wireless technology (it does not support the uB45-B frequency model for alarm
functionality, but will accept the uB45 for transmitter operation). The carrier
provides isolated host power to the module, and separate isolated relay contacts
(dual FORM C mechanical or dual FORM A solid-state relay contacts). The carrier
also provides a wired interface for the module’s 0-5V output and adds a tandem 0-
20mA current output. Independent High/Low alarm levels or a window alarm may
be configured for each relay. Alarm levels are configured in the captive Bluetooth
wireless technology module via a smartphone or tablet and our free mobile app.
Note: For alarm operation, the plugged-in Bluetooth wireless technology input
module must be configured for the alarm carrier with 0-5V output, and have any
input sub-range scaled to 0-5V output. However, for transmitter-only operation, it
will additionally support any uB input model that has 0-5V output, and will provide
isolated power to the module, and drive separate transmitter outputs of 0-5V/5mA,
or 0-20mA/0-550Ω.
Mechanical Dimensions
Units may be mounted to 35mm “T” type DIN rail (35mm, type EN50022), and side-by-
side on 22.5mm (0.9-inch) centers.
WARNING: IEC Safety Standards may require that this device be mounted within an
approved metal enclosure or sub-system, particularly for applications with exposure to
voltages greater than or equal to 75VDC or 50VAC.

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 7 -
http://www.acromag.com
- 7 -
https://www.acromag.com
DIN Rail Mounting & Removal
When removing the carrier from the DIN rail, it is recommended that your uB input
module be unplugged from the top of the carrier first. Refer to the figure below for
attaching and removing the carrier from the DIN rail. The DIN rail clip located on
the bottom side is spring-loaded. The opposite rounded edge at the bottom of the
top side allows you to tilt the unit upward to lift it from the rail while prying the
spring clip back with a screwdriver along the bottom as shown below.
To attach the carrier to T-type DIN rail, angle the top of the unit towards the rail and
place the top groove of the carrier over the upper lip of the DIN rail. Firmly push
the unit downward towards the rail until it snaps into place.
To remove it from the DIN rail, first separate the input and power terminal blocks
(TB1-TB3) from the bottom side of the module to create clearance to the DIN
mounting clip. You can use a screwdriver to pry the pluggable terminals out of their
sockets. Next, while holding the carrier in place from above, insert a screwdriver
along the bottom side path of the carrier to the DIN rail clip and use it as a lever to
force the DIN rail spring clip down, while pulling the bottom of the carrier outward
until it disengages from the rail. Then simply tilt the carrier upward to lift it off the
rail.

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 8 -
http://www.acromag.com
- 8 -
https://www.acromag.com
ELECTRICAL CONNECTIONS
WARNING –EXPLOSION HAZARD –Do not disconnect equipment unless power has
been removed or the area is known to be non-hazardous.
WARNING –EXPLOSION HAZARD –Substitution of any components may impair
suitability for Class I, Division 2.
WARNING –EXPLOSION HAZARD –The area must be known to be non-hazardous
before servicing/replacing the unit and before installing.
Carrier terminals can accommodate 14–26 AWG (2.5–0.14mm2) solid or stranded wire
with a minimum temperature rating of 85oC. Input wiring may be shielded or
unshielded type (twisted pair or shielded twisted pair input wiring is recommended).
Terminals are pluggable and can be removed from their sockets by prying outward from
the top with a flat-head screwdriver. Strip back wire insulation 0.25-inch on each lead
and insert the wire ends into the cage-clamp terminal block connector. Use a
screwdriver to tighten the screw by turning it clockwise to secure the wire (use 0.5-
0.6nM torque). Since common mode voltages can exist on I/O wiring, adequate wire
insulation should be used and proper wiring practices followed. As a rule, input wires
are normally separated from power, output, and relay wiring for safety and isolation
support, as well as for low noise pickup.
Isolation Barriers
uBTA-H-1MR Shown or uBTA-H-1SR
!

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 9 -
http://www.acromag.com
- 9 -
https://www.acromag.com
Power Connections
Connect DC power from 6-32V as shown in the drawing below. Observe proper polarity
(input power is safety-isolated and reverse-polarity protected). For supply connections,
use 14 AWG wire rated for at least 85°C. Do not exceed 36V DC peak.
The unit may be optionally powered (or redundantly powered) via its DIN rail connector
as shown below (optional terminal is required). The bus power connector of the
module can be used to interconnect between modules by plugging them together and
then connecting them as a group to a suitable power supply using an optional left or
right terminal block, 1005-220 or 1005-221, as shown.
!

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 10 -
http://www.acromag.com
- 10 -
https://www.acromag.com
Power
Connections…
IMPORTANT –End Stops: If this module uses optional bus power, or is redundantly powered via
the DIN rail bus, then for hazardous location installations (Class I, Division 2 or ATEX Zone 2) it
must also use two end stops to help secure the terminal block and module assembly to the DIN
rail (Acromag part 1027-222 not shown but included in XTBUS-KIT).
IMPORTANT - Fusing: It is recommended that supplies capable of delivering more than 2.5A of
power to the carrier (or bussed carriers) be fused with a surge tolerant fuse. Unit includes a
transient voltage suppressor clamp across its power input that will clamp transient overvoltage
conditions. A sustained over-voltage condition from an unfused power supply could drive
excessive fault current flow in the circuit that can damage the carrier if allowed to exceed 3A.

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 11 -
http://www.acromag.com
- 11 -
https://www.acromag.com
Input Connections, BLE Jumper, and CJC Jumper
A single MicroBlox input module plugs directly into the front panel opening of this carrier and is retained by
an internal spring clip. Input connections are wired to the carrier terminals in the same fashion as input
connections to uB modules when mounted on uB back-panels (refer to your uB manual per specific model).
Wired jumpers are also used on this carrier to enable BLE linking and CJC connections, and have the same
effect as setting the standard uB backpanel BLE and CJC switches (a jumper present equals switch ON).
Observe proper polarity when making input connections. TB1 of this carrier connects INPUT ±, while TB2
connects EXC ±. The last two terminals of TB1 are for installation of a CJC jump-wire to enable CJC for some
input models (see table above) and this has the equivalent function of the CJC DIP switch of uB back-panels.
Similarly, TB2 includes two jumper terminals to enable Bluetooth wireless technology linking (refer to your uB
model instructions) and adding this jumper is equivalent to switching the BLE DIP switch of uB back-panels
ON.Refer to the table above and add or remove this jump-wire between the last two terminals of TB1—some
modules will require a CJC connection, while others do not. Installing a jump wire between the first two
terminals of TB2 will enable you to link to the installed uB module using Bluetooth wireless technology from
your smartphone or tablet (remove this jumper to block access). Refer to the figure above and your specific
uB module manual (see below) for info on making input connections, or for information about CJC jumper
installation, or enabling Bluetooth wireless technology linking:
REFERENCE
DESCRIPTION
8501-037
uB31 & uB41 Voltage Input User Manual
8501-040
uB30 & uB40 mV Input User Manual
8501-041
uB32 DC Current Input User Manual
8501-042
uB42 DC Current Input w/2-Wire Excitation User Manual
8501-043
uB34 2/3-Wire & uB35 4-Wire RTD Input User's Manual
8501-044
Introduction to Agility Configuration Tool for microBlox®
8501-047
uB37 & uB47 TC Input User Manual
8501-050
uB04/uB08/uB16 Back-Panel User Manual

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 12 -
http://www.acromag.com
- 12 -
https://www.acromag.com
Earth Ground Connections
The unit housing is plastic and does not require an earth ground connection
to itself. If the module is mounted in a metal housing, an earth ground wire
connection to that metal housing’s ground terminal (green screw) is usually
required using suitable wire per applicable codes. Isolated circuits wired to
this carrier are normally earth grounded. Power connections usually apply
earth ground at DC- to the unit. Output connections apply earth ground to
the transmitter output common terminal. Circuits wired to analog inputs
should be earth grounded as reflected in their connection diagram for the
specific module model. Ground connections noted are recommended for best
results and help protect the unit and its isolated circuitry by giving it a low
impedance path to ground for shunting potentially destructive transient
energy away from sensitive module circuitry. Refer to the Electrical
Connection Drawings for recommended input, transmitter output, and power
ground connections.
Interposing Relay Connections
If you need to raise your alarm control capability and drive larger loads with
load voltages and/or current demands greater than the rated capacity of this
unit’s mechanical or solid-state outputs, then you may choose to instead drive
a higher capacity interposing relay that connects to the load, in similar fashion
to the following figures (always be sure to also include inductive load
protection at your load as shown on the next page):

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 13 -
http://www.acromag.com
- 13 -
https://www.acromag.com
Interposing Relay Connections
IMPORTANT: Because the solid-state relay of the uBTA-H-1SR model is both AC and DC rated, it is not possible
to also include contact protection built-into the relay output of this device (a diode is normally used for DC,
and a MOV for AC). The required protection is always best placed at the load as shown above. You should
always include this protection in your installation when switching inductive loads, or damage to the relay could
occur.
Add Contact Protection When Switching Inductive Loads
If any of your alarm relays are controlling inductive loads or driving interposing relay
coils, then it is recommended that you add additional protection local to the
inductive load or interposing relay as shown in the figures above (these carriers do
not already include this protection which is different for AC and DC loads). For DC
loads, this protection typically takes the form of a diode placed in reverse of normal
current flow through the load, but right at the load terminals (see this protection
illustrated in the prior figure for driving an interposing relay where it is placed
across the terminals of the interposing relay coil). When choosing this protection, it
is recommended that you select a diode with an inverse voltage rating at least twice
the load voltage, and a continuous current rating greater than your load current.
The purpose of this diode is to squelch the high reverse voltage that develops in the
coil when current through the coil is switched OFF. By placing it local to the load, it
prevents this switching transient from being distributed along the wiring to the
carrier which could also inductively couple noise into adjacent circuits and will raise
emissions. It also helps protect and extend the life of the relay contacts or the
switch controlling the load. For more information on this protection, please refer to
Acromag Application Note 8501-088 available for download at www.acromag.com.

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 14 -
http://www.acromag.com
- 14 -
https://www.acromag.com
Transmitter Output Connections
This carrier includes both 0-20mA current (550Ω max), and 0-5V voltage (1KΩ min)
transmitter output connections at TB4 as shown below. Output voltage is driven
directly by the plug-in module, while the carrier includes a voltage to current
converter to also output 0-20mA DC for 0-5V driven by the module. The
simultaneous current and voltage outputs are not isolated from each other and
share common. This output circuit is normally earth grounded at the output
common terminal as shown below.
Note –For 4-20mA Transmitter Output: The alarm carrier normally requires that
the input module scales its input range to 0-5V for use on this carrier, and this
will drive 0-20mA at the carrier’s current output. If your application requires a 4-
20mA current output, you may use the I/O Scaling function of the Agility mobile
app to scale your module’s input range to 1-5V output instead of 0-5V, and this
will produce 4-20mA from the alarm carrier (note that the tandem voltage output
of the carrier also becomes 1-5V, not 0-5V). The Agility App can also scale this for
you if you select 4-20mA as an output type option under the uBTA Alarm tab.

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 15 -
http://www.acromag.com
- 15 -
https://www.acromag.com
CONFIGURATION SOFTWARE
The alarm functionality of this carrier is setup inside the Bluetooth wireless technology uB module plugged into it. You
may configure alarm operation via our Agility mobile app and a Bluetooth wireless technology link to your Android or iOS
smartphone or tablet. The Agility software can be downloaded free of charge from our web site at www.acromag.com.
Quick Overview
The screen at left is the uBTA Alarm configuration screen of
the Agility mobile app. To configure a uB input module for
installation in the alarm carrier, select the uBTA Alarm tab
and drag the “Alarm Carrier Attached” switch right to ON as
shown. Scroll down the page to complete the Alarm
configuration.
This carrier provides two independent alarm relays for the
input module and one or both relays may be configured as
either a high, low, or window alarm, each with its own dead-
band control using the screen at left (scroll down). You can
set limits for each relay and/or specify a Reverse Acting
alarm if you want fail-safe alarm action (failsafe refers to
matching the alarm state of the contacts to the power-off
state). Note that a window alarm may be configured for
either relay and would trip for any input level outside the
window defined by the high and low values specified for the
relay (see Alarm operation on page 15). Orange Relay LED’s
on the unit indicate the relay energized condition.
For complete information on Agility, please refer to its
instruction manual 8501-044, available for download from
our web site at www.acromag.com

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 16 -
http://www.acromag.com
- 16 -
https://www.acromag.com
Optional Output Current Trim Adjustment
IMPORTANT: This adjustment has
already been done at the factory
using precision instruments and
should not be attempted in the
field unless fine accuracy can be
assured (precision load, DVM,
input source, etc.). Otherwise, you
could make the current output less
accurate.
This carrier includes both analog voltage (0-5V) and current output (0-20mA). The
voltage output is driven by the plug-in module directly, while the carrier includes a
voltage to current converter on-board to drive 0-20mA from the 0-5V provided by
the module. Normally, the current output will not require a trim adjustment,
except perhaps to precisely set its output to tighter accuracy or to correct for long-
term component aging. A 15-turn mechanical trim pot is included in this circuit to
fine tune the full-scale 20mA output with 5V full-scale from the module. It provides
roughly ±0.08mA of adjustment around 20mA and is accessible with a screw-driver
inserted through one of the vent openings on the bottom/input side of the module
as shown in the drawing below. If your full-scale current output is not within ±0.1%
of 20mA, you may utilize this trim pot to make fine adjustment to its current output
at full-scale (with 5V full-scale from module).
CAUTION: You must be very careful when inserting a screwdriver into this vent to
adjust the trim pot. Most screwdrivers are conductive and it would be very easy to
inadvertently short circuit the enclosed circuit if the screwdriver blade did not align
with the trim pot screw and was inadvertently pushed too far into the circuit
enclosure. This could damage the live circuit and may be unsafe if isolation is
inadvertently violated.
Refer to the following figure to locate this adjustment screw. Turn the pot screw
clockwise to increase the output current at full-scale, and counter-clockwise to
reduce the full-scale current. To monitor the output current, it is best to use a
precision load resistor with greater accuracy than ±0.1%, and measure output
current as a function of the voltage drop across this load resistor. A 250Ω precision
resistor will indicate 5V across it with precisely 20mA through it.
Note that you can optionally make this adjustment without plugging a module into
a powered carrier by simply connecting a precision 5V signal to the voltage output
terminals to mimic a module present (with no module plugged in, observe proper
polarity), then adjusting the current output to precisely 20mA by adjusting this pot
as required. With a precision 250Ω load across the current output terminals, you
would adjust this pot until you read precisely 5V±5mV on a DVM placed across the
load resistor. Of course, doing it this way would not additionally compensate for
any potential module offset of up to ±0.05% or ±2.5mV between different
calibrated modules in the same carrier socket.

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 17 -
http://www.acromag.com
- 17 -
https://www.acromag.com
TECHNICAL REFERENCE
Block Diagram

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 18 -
http://www.acromag.com
- 18 -
https://www.acromag.com
How It Works
Key Points of Operation
- Input Module plugs in and are
available for current, voltage,
RTD, and temperature input.
- Carriers include dual mechanical
or solid-state alarm contacts.
-Carriers also drive voltage and
current transmitter outputs.
- All I/O uses 16-bit A/D and D/A
conversion.
-Isolated 6-32V DC Powered.
-Input, Output, Power, and each
Relay are isolated from each
other.
A microBlox® input module is captively-plugged into this carrier through its front
panel. The carrier drives isolated 5V power to the module from an isolated flyback
converter that operates from 6-32V. It receives a 0-5V output signal from the
plugged-in module, isolated from and proportional to the module’s field input
signal. A local microcontroller on the carrier handles alarm management. It
retrieves alarm configuration information from the module via a serial bus. Alarm
configuration parameters are set inside the module via a Bluetooth wireless
technology link to the module from a smartphone or tablet using the Acromag
Agility mobile app. The carrier includes separate analog output terminals for
module output voltage (0-5V/5mA), and locally derived output current (0-
20mA/550Ω). The carrier includes dual FORM C (SPDT) mechanical relay contacts,
or dual FORM A (SPST) solid-state relay contacts depending on model. A 15-turn
mechanical pot on the carrier allows optional fine adjustment of its current output
for long-term maintenance purposes or to correct for circuit aging. Refer to the
block diagram above to gain a better understanding of how this carrier works.
Alarm Operation
uBTA-H-1x Models Only
With two relays, this product supports two High or Low limits, or two window
alarms. Refer to the following figures to understand how the limit and window
alarms operate:

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 19 -
http://www.acromag.com
- 19 -
https://www.acromag.com
TROUBLESHOOTING
Diagnostics Table
Before attempting repair or
replacement of this carrier, be sure
that all installation and
configuration procedures have
been followed and that the carrier
is wired properly. Verify that 6-
32V power is applied to the carrier.
Verify that any input module
plugged into this carrier is
operating properly.
If you still have a problem after
checking your power, your wiring,
and your module, and after
reviewing this information, or if
other evidence points to an
unknown problem with the carrier,
an effective and convenient fault
diagnosis method is to exchange
the questionable carrier or module
with a known good unit.
Acromag’s Application Engineers
can provide further technical
assistance if required. Repair
services are also available from
Acromag.
POSSIBLE CAUSE
POSSIBLE FIX
Green RUN LED of Carrier does not light…
Is Power ON at the Carrier? Is a
module plugged into the carrier?
Check power to the carrier. The Green PWR
LED will be ON if a module is plugged in and
unit is powered?
The plug-in Module’s +3.3V rail
drives this LED and has failed, or
the carriers 5V power to the
module has failed.
Check power to the carrier which drives 5V
power to the module. The green LED is
sourced by the module’s 3.3V rail. Check if
the module is bad by plugging-in a known
good module. Return failed modules for
repair or replacement. If the module is
good, the carrier’s power converter may be
bad and you can return it for repair or
replacement.
Blue BLE LED of Carrier does not light…
Cannot Communicate with Module Using Bluetooth wireless technology…
Is the BLE jump wire installed at
TB2?
Is the BLE jump-wire connected
between the wrong TB2
terminals?
Check your TB2 connections. A wire jumper
should be inserted between the first two
terminals of TB2, which turns the BLE LED
ON and allows you to link to the plug-in
module using the Agility mobile app to
accomplish alarm reconfiguration.
Unit Fails to Start-up or Initialize…
Carrier input power voltage is
below 6V, or the input supply is
current-limited below twice the
module/carrier current draw and
has shut down.
Check your power voltage and capacity and
make sure that it is at least 6V and of
sufficient current capacity (refer to Power
and make sure the supply current capacity
is twice the max current draw of your
application).
Input Polarity is Wrong…
Are your input terminals
reversed? The unit has reverse
polarity protection to 60V.
Check your input (field) wiring and observe
proper polarity. Voltage is positive and
current is input at the IN+ terminal, while
voltage is negative and current is returned
at the IN- terminal.
Your uB Module Does Not Appear to Work in This Carrier
Is your module a Model
uB45-B?
The uB45-B frequency model is not
compatible with this carrier for alarms, but
permissible for transmitter functionality.
Is your module Bluetooth
wireless technology enabled?
Only uBxx-B models with Bluetooth wireless
technology may be used in this alarm
carrier. Optionally, for transmitter-only
operation, fixed range uB models with 0-5V
output may be used to convert their output
voltage to output current on this carrier.

microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: [phone] - 20 -
http://www.acromag.com
- 20 -
https://www.acromag.com
TROUBLESHOOTING
Diagnostics Table
POSSIBLE CAUSE
POSSIBLE FIX
Alarm Contacts are “Chattering” or Alarm LED is blinking...
Have you applied dead-band
correctly?
Increase the alarm dead-band setting (Refer
to Alarm Operation on Page 16 to see how
dead-band can combat chatter).
Output Signal Appears Noisy or Unstable...
Is the uB module fully inserted
into the carrier socket?
Check that the module is fully plugged into
its socket. Note that uB45-B models are not
compatible with this carrier for alarms, but
acceptable for transmitter functionality.
Have you grounded your input
signal? Ungrounded inputs
require an earth connection as
noted in the module
specifications.
Earth ground keeps isolated signals from
floating and provides a safe path to shunt
away destructive transient energy. If your
input source is not already earth grounded,
then refer to its connection diagram and
apply earth ground as noted (typically to the
IN- terminal of an input, see module wiring).
Voltage Output is noisy
The voltage output of this carrier is driven
directly by the plug-in module. If noisy, the
field input signal may be floating or is not
earth grounded, or perhaps the output is not
earth grounded.
Check CJC Jumper
Refer to your module specifications and
determine the required CJC jumper status.
Install or remove this jumper as required.
Voltage Output is Over-Loaded
The 0-5V output can only drive up to 5mA
into loads greater than or equal 1KΩ.
Current Output cannot drive
full-scale current of 20mA.
The current output load resistance is greater
than 550Ω. If load resistance is equal to or
less than 550Ω, then the carrier’s 14.5V
internal rail may have failed and the carrier
can be returned for repair or replacement.
Service & Repair Assistance
Plug-in modules are encapsulated and cannot normally be repaired, except for
possible reconfiguration and factory reprogramming. The carrier itself contains
solid-state components and requires no maintenance, except perhaps for periodic
cleaning. Additionally, the carrier enclosure is not meant to be opened for access
and can be easily damaged if snapped apart. Thus, it is highly recommended that a
non-functioning carrier be returned to Acromag for repair or replacement.
Acromag has automated test equipment that thoroughly checks and calibrates the
performance of each unit, and can restore or update firmware if needed. Please
refer to Acromag’s Service Policy and Warranty Bulletins, or contact Acromag for
complete details on how to obtain repair or replacement.