Moore Industries DDA Series User manual

DDA
DDA
DIN-style
Direct Current Alarm
May 2016
192-720-00 C
DIN-style
Direct Current Alarm

Table of Contents
Introduction .......................................................................................................1
Description.........................................................................................................1
Specifications ....................................................................................................1
Ordering Information......................................................................................... 2
DDA Model Numbers .......................................................................................................... 2
Options ............................................................................................................................... 2
Calibration..........................................................................................................3
Alarm Terminology .............................................................................................................. 4
DDA Controls ......................................................................................................................5
Calibration Setup ................................................................................................................8
Calibration Procedures ..................................................................................................... 11
Calibrating a Unit with the DA Option................................................................................ 12
Setting Deadband for AD Equipped Units ......................................................................... 12
Installation ....................................................................................................... 13
Mounting the DDA............................................................................................................. 13
Making the Electrical Connections .................................................................................... 14
Recommended Ground Wiring Practices .......................................................................... 14
CE Conformity...................................................................................................................14
Operation ......................................................................................................... 21
Customer Support........................................................................................... 22
List of Figures andTables
Figure 1. How the DDA Alarm Operates .............................................................................................................. 4
Figure 2. Disassembling the DDA ........................................................................................................................ 5
Figure 3. PC4 Component Locations ................................................................................................................... 6
Figure 4. Calibrating the Single-alarm DDA ......................................................................................................... 8
Figure 5. Calibrating the Dual-alarm DDA ............................................................................................................ 9
Figure 6. Calibrating Single-alarm DDAs with the Transistor Switch Output Option ............................................. 9
Figure 7. Calibrating the Dual-alarm DDA with the Transistor Switch Output Option ......................................... 10
Figure 8. Calibrating the DDA with the Deviation Alarm Option.......................................................................... 10
Figure 9. Dimensions of the DDA ....................................................................................................................... 13
Figure 10. Installing the Single-alarm DDA ........................................................................................................ 15
Figure 11. Installing the Dual-alarm DDA ........................................................................................................... 15
Figure 12. Installing the Single-alarm DDA with the Transistor Switch Output Option ........................................ 16
Figure 13. Installing the Dual-alarm DDA with the Transistor Switch Output Option .......................................... 16
Figure 14. Installing the Dual-alarm DDA with the Double-pole/Single-throw, Normally Open Relays Option ... 17
Figure 15. Installing the Dual-alarm DDA with the Double-pole/Single-Throw, Normally Closed Relays Option 18
Figure 16. Installing the Dual-alarm DDA with the Double-pole/Single Throw, Normally Open/Normally Closed
Relays Option ................................................................................................ .................................... 19
Figure 17. Installing the Single-alarm DDA with the Deviation Alarm Option .....................................................19
Figure 18. Installing the Dual-alarm DDA with the Deviation Alarm Option ........................................................ 20
Figure 19. Installing the Single-alarm DDA with the Transmitter Excitation Option ............................................ 20
Figure 20. Installing the Dual-alarm DDA with the Transmitter Excitation Option ............................................... 21
Table 1. Failsafe/Non-failsafe Jumper Settings .................................................................................................... 7
Table 2. High/Low Alarm Jumper Settings ........................................................................................................... 7
Table 3. EU Option Display Range Jumper Settings ............................................................................................ 7
Table 4. Calibration Equipment ............................................................................................................................ 8

DDA
Page 1
The Interface Solution Experts
Introduction
Moore Industries’ DIN-style Direct Current alarm, the
DDA, accepts all standard process current and volt-
age inputs and provides an alarm response to input
that falls outside of an adjustable preset limit. The
DDA comes in single- and dual- alarm models. The
dual-alarm model allows two separate trip points to
be configured per module.
This manual contains the information necessary to
calibrate, install, operate, maintain, and troubleshoot
the DDA. It includes a brief unit description, a table
of performance and operational specifications, and
an explanation of Moore Industries’ model number
based product data tracking system.
The following guidelines are used throughout the
manual:
WARNING – Hazardous procedure or condition that
could injure the operator.
Caution – Hazardous procedure or condition that
could damage or destroy the unit.
Note – Information that is helpful for a procedure,
condition, or operation of the unit.
Description
The DDA is a 4-wire, process alarm that is powered
by an external 24 Vdc power source. It accepts stan-
dard process current or voltage (factory-set) and re-
sponds to a user-adjustable trip point by changing
the output state when the input exceeds the trip point
setting. The output is either a normally-open (NO) or
normally-closed (NC) relay contact-closure (stan-
dard), or an opto-isolated, open-collector transistor
(optional).
The DDA is factory-set for single- or dual-alarm
operation. Standard single-alarm units have a
double-pole, double-throw (DPDT) relay output (out-
put A). Standard dual-alarm units have two single-
pole, double-throw (SPDT) relay outputs (outputs A
and B).
The standard DDA has a built-in 1.0 percent dead
band. The unit resets when the input signal has
crossed over the trip point on its return to the user-
selected non-alarm range, and is 1.0 percent of span
beyond the trip point.
The unit housing is a plastic, DIN-style case that can
be mounted on either a DIN-style top-hat rail (stan-
dard) or G-rail (optional). Refer to the Installation
Section for housing dimensions.
Specifications
Display Accuracy:
±0.1% of input span;
±1 count to include
repeatability,
hysteresis, and
adjustment
resolution
Repeatability: Trip
point repeats within
±0.1% of input span
Dead Band: 1% of
input span (stan-
dard)
Signal Response:
-3dB @ 5Hz typical
(low pass)
Alarm Response:
50 milliseconds
standard
Isolation: 500Vac,
input to output to
power
RFI/EMI Effect: With field
strengths of 10V/m, at
frequencies of 20-500 Mhz,
unit will not go into alarm
status unless process
variable is within ±1.0% of
trip point
Range: -18°C to 65°C
(0°F to 149°F)
Effect: ±0.018% of span/°C
Front Panel Adjustments
Type: Multiturn
potentiometers
Trip Point(s): Adjust over a
range of -5% to 105% of
span, typical
Input/Trip Point Viewing:
Two or three-position rotary
switch allows selection of
viewing the Input, Trip A, or
Trip B on the integral LCD
Internal Adjustments Type:
Multiturn potentiometers
Zero: Adjustable to ±10% of
span
Span: With full scale input,
output is adjustable to 100%,
±10% of span.
Display: 3½ digit LCD
displays either Input, Trip A
setting, or Trip B setting as
determined by rotary switch;
display indicates from -5.0%
to 105% of input span and id
linear with respect to the
input signal
Trip Point: Led(s) on front
panel indicates alarm status
for each trip point ("ON" LED
indicates energized relay)
297 grams (10.5 ounces)
Peformance Peformance
(continued)
Ambient
Temperature
Adjustments
Adjustments
(continued)
Indicators
Weight

Page 2
DDA
The Interface Solution Experts
DDA Model Numbers
To order additional or replacement modules for your
system, refer to the Ordering Information table and
“build” a model number using the information in bold
text. Specify the following in order:
Product / Input / Output / Power / Option
[Housing]
For example, specify:
DDA / 4-20MA / DH1L2 / 24DC / -AR5 [DIN]
Options
The following options are available with the DDA:
AD Option. Adjustable Deadband. Allows you to
adjust the deadband to any value between 1 and 20
percent of span. (Not available with MR Option.)
AR Option. Alarm Response delay. A factory-set
option which causes the output to react to an alarm
condition after a specified time delay. The available
delays are between 1-30 seconds.
DA Option. Deviation Alarm. Accepts input from
two sources and then displays a value that is pro-
portional to the difference between the two signals.
When both input signals are equal to each other, the
LCD will display 50.0 percent. This is true regard-
less of what the actual value of the inputs are, as
long as they are of equal value. If either input sig-
nal varies, the proportional difference between the
two values will be added to or subtracted from the
balanced indication of 50.0 percent that is displayed
on the LCD. (Not available with TX Option.)
DPSTNO Option. Double-Pole/Single-Throw with
Normally Open relays . Requires dual alarms.
DPSTNC Option. DPST Normally Closed relays.
Requires dual alarms.
DPSTNONC Option. DPST with one normally open
and one normally closed contact per relay. Requires
dual alarms.
EU Option. Engineering Units . Provides user-
selectable values for display in the range of 0-200
through 0-1999. (Consult factory for engineering
unit values not starting at zero.) This option also al-
lows for changing the position of the decimal point to
any one of three locations.
GR Option. G-Rail. Adaptor for mounting on a DIN
(EN50035) G-rail.
Ordering Information
DDA Current:
0-20 mA @25Ω
1-5 mA @100Ω
4-20 mA @25Ω
10-50 mA @10Ω
Voltage @ 1MΩ
0-1V
0-5V
1-5V
0-10V
Alarm Configuration: (High/Low and
Failsafe/Non-Failsafe are jumper-
selectable)
SH1 Single, High, Failsafe
SH2 Single, High, Non-Failsafe
SL1 Single, Low, Failsafe
SL2 Single, Low, Non-Failsafe
DH1L1 Dual, High/Low, Failsafe
DH2L2 Dual, High/Low, Non-Failsafe
DH1H1 Dual, High/High, Failsafe
DH2H2 Dual, High/High, Non-Failsafe
DL1L1 Dual, Low/Low, Failsafe
DL2L2 Dual, Low/Low, Non-Failsafe
(DPDT relays standard on single alarms,
SPDT relays standard on dual alarms;
relay contacts rated 5A @ 116Vac or
28Vdc or 2A @ 249Vac; all non-inductive
loads, 50/60Hz)
24DC
Accepts
24Vdc,
±10% (1.5
to 2.5 watts
nominal;
3.3 watts
max., with
TX option)
-AD Adjustable Deadband
-AR Alarm Response time delay
-DA Deviation Alarm
-DPSTNO DPST Normally Open
relays (dual alarms)
-DPSTNONC DPST with one
Normally Open and one
Normally Closed contact per
relay (dual alarms)
-EU Indicator displays in
engineering units
-GR Adaptor for mounting on a
DIN (50035-G32) G-rail
-HS Hermetically Sealed relays
-MR Manual Reset
-TSO Transistor Switch Output
-TX 2-wire Transmitter Excita-
tion
DIN
Thermoplastic,
DIN-style rail
(35mm Top Hat
Rail) mount
housing with
removable
terminal blocks.
Unit Input Output Power Options Housing

DDA
Page 3
The Interface Solution Experts
Calibration
Prior to shipment, every DDA is subjected to rigor-
ous testing by our team of skilled technicians. Ev-
ery product Moore Industries manufactures, sells
and services is guaranteed to meet the strict quality
standards that have become synonymous with our
name.
Before placing your DDA into service, a bench
check of basic operation is recommended to ensure
that the unit hasn’t sustained any damage during
transit, and to set zero and span for your application.
Every unit should be:
• Checked to verify that the appropriate DDA
model has been ordered for the intended
application.
• Connected in a calibration setup and checked
for desired output.
• Adjusted for desired zero and span.
• Checked for proper trip point, TSO output or
relay function.
Even if a unit has been configured to your specifica-
tions by the factory (factory calibration), it is a good
idea to perform a simple bench check. The proce-
dures provide a safe means to uncover any unit
damage that may have occurred during shipping,
and offer a familiarization with DDA operation in the
safety of a testing environment, separate from the
intended process or application.
These procedures should be carried out in an envi-
ronment appropriate for general testing of electronic
equipment. Use a technician’s bench or a similar,
lab-type environment.
The DDA has internal and external potentiometer
adjustments. All configuration jumpers are inside
the unit. Some user-selectable features require a
combination of potentiometer adjustments and
jumper settings to set them. Use of the jumpers and
potentiometers is described later in this section.
Although the front panel LCD and LEDs are very
useful for making adjustments, additional test equip-
ment is required to bench check and calibrate the
DDA. A list of the calibration equipment required
and its hookup are described later in this section.
HS Option. Hermetically sealed relays rated 3A @
28Vdc non-inductive or 1A @ 120Vac non-inductive,
50/60Hz.
MR Option. Manual Reset. A pair of terminals (la-
beled “RS” and located on the same terminal strip as
the other alarm output contacts) are provided for
each output. These must be shorted momentarily to
clear an alarm condition. (Non-latching pushbut-
tons must be supplied by the user. Toggle or latch-
ing switches are not recommended because the
alarm cannot go into an alarm state if the RS termi-
nals are permanently closed.) (Not available with
the AD Option.)
Note:
Units equipped with the MR option must be
reset manually after input returns to a non-
alarm level.
TSO Option. Transistor Switch Output. Provides
an open-collector transistor output instead of the
standard contact closure relay(s). Can switch 60mA
at 60Vdc maximum.
TX Option. Transmitter Excitation. Provides 24 Vdc
at 25 mA to drive a process loop directly from the
DDA. (Not available with the DA Option or with 10-
50 mA input units.)

Page 4
DDA
The Interface Solution Experts
Alarm Terminology
Moore Industries suggests that all users take a few
moments to become familiar with some of the terms
associated with the use of process instrumentation
alarms.
Figure 1 illustrates the way the DDA alarm operates.
For more in depth information, contact the factory for
a copy of Moore Industries’ publication “Alarm Trips:
The Ups and Downs”.
Trip Point is the process input level at which the
user wants an alarm relay to change state, typically
going into an alarm condition, or “tripping”. The DDA
alarm trip point is set by adjusting the TRIP poten-
tiometer.
High Alarms trip when the process input goes
above the trip point. Low Alarms trip when the
process input drops below the trip point. The DDA
alarm output can be set to function as either a high
or low alarm.
Reset Point is the process input level at which the
alarm relay changes state, going from alarm to non-
alarm. The reset point is not necessarily the same
as the trip point, because most applications call for
a buffer zone or “deadband” around the trip point to
allow for minute fluctuations in the process input.
Deadband is the range in which an alarm relay re-
mains in an alarm condition even after the monitored
process variable input has returned to a safe level,
at or below/above the trip point setting. The stan-
dard deadband for the DDA is 1% of the input span
unless the unit is equipped with the AD option. AD
units have an adjustable deadband of 1-20% of the
input span.
The relays of a Failsafe Alarm are de-energized
when tripped or power is lost, energized when the
process input is at a non-alarm level. Non-failsafe
Alarm relays are energized when tripped, de-en-
ergized when the process input is at a non-alarm
level. The DDA alarm option can be switched from
failsafe to non-failsafe at any time by changing the
jumper settings.
Figure 1. How the DDA Alarm Operates
IN ALARM
IN NON-ALARM
PROCESS INPUT
HIGH ALARM
TRIP POINT
RESET
LOW ALARM
TRIP POINT
RESET
TIME
DEADBAND
DEADBAND
RESET
RESET
TRIP
TRIP

DDA
Page 5
The Interface Solution Experts
INNER CONNECTING
RIBBON CABLE
RELEASE TABS
PC4
TRIP
POINT A
LED
LCD
TRIP
POINT B
LED
TRIP POINT A
ADJUSTMENT
TRIP POINT B
ADJUSTMENT
ZERO ADJUSTMENT
SPAN ADJUSTM ENT
PC3
DISPLAY
CONTROL
NOTE: Disassembly is required to access
jumper s and i nter nal potentiometer s.
TRIP POINT B
AD OPTION ADJUSTM ENT
TRIP POINT A
AD OPTION ADJUSTM ENT
DDA Controls
The DDA’s controls consist of: the Display Control
located on the front panel, the internal jumpers, and
the internal and external potentiometer adjustments.
Display Control. The Display Control allows you to
select the currently applied input signal or a trip point
setting for viewing on the LCD.
When the Display Control is rotated to the position
labeled “INPUT”, the LCD displays a percent of
span. For units equipped with the EU Option, the
displayed values depend on the user-selected range
that the unit is configured for.
To view the A or B trip point setting, rotate the Dis-
play Control to the position labeled “A” or “B”, re-
spectively. The trip point setting(s) can be varied at
this point by adjusting the corresponding trip point
potentiometer.
Single-alarm units have a single trip point setting
designated as “A” on the front panel. Rotating the
Display Control to position A displays the trip point
setting for output A in a percent of span for standard
units (a unique value is displayed for DDAs with the
EU Option). The A trip point potentiometer is used to
adjust the trip point setting to the desired value (see
Figure 2).
Dual-alarm units have two trip point settings: A and
B. Rotating the Display Control to either trip point
displays the corresponding trip point setting on the
LCD. A separate potentiometer is provided for each
trip point. Single-alarm units have only an “A” trip
point potentiometer. Figure 2 shows the location of
the trip point potentiometers for dual and single-
alarm units. Single-alarm units do not have “B” trip
point potentiometers.
Units equipped with the Engineering Units (EU) Op-
tion display the input and trip point values in user-
specified units-of-measure.
Figure 2. Disassembling the DDA

Page 6
DDA
The Interface Solution Experts
Jumpers. The DDA is field-configured with remov-
able jumpers for the following functions:
• High- or low-alarm configuration
• Failsafe or non-failsafe operation
• Engineering units range (EU Option)
• Decimal point position on the LCD (EU Option)
All jumpers are located on PC4 (see Figure 2).
These are accessed by removing the DIN housing.
To remove the housing, pry each of the release tabs
outward with a screwdriver. After the first release
tab is open, pull the unit forward to keep the tab from
reinserting itself. Use the screwdriver to pry out the
second tab, then pull the unit from the housing. The
jumper and potentiometer locations are shown in
Figure 3.
Table 1 (see page 7) lists the jumper settings for
failsafe or non-failsafe modes. Table 2 (see page 7)
lists the jumper settings for high- or low-alarm op-
eration. Table 3 (see page 7) lists the jumper set-
tings for the EU Option and decimal point position.
Match the jumper designations in Figure 3 with the
jumper tables to identify the location of the jumper
pins to be shorted.
Caution:
Use static control procedures when
changing jumper settings in order to avoid
damaging the DDA’s internal components.
Potentiometers. The trip point adjustments are the
external potentiometers located on the front panel.
One trip-point potentiometer is provided for single-
alarm units, and two are provided for dual-alarm
units. The trip point potentiometers vary the trip
point settings within the established display range of
the unit. Figure 2 on page 5 shows the location of
trip point potentiometers A and B.
The Zero and Span Potentiometers and the Adjust-
able Dead Band Potentiometers (with AD Option
only) are adjusted internally. These potentiometers
are located on PC4. The DDA must be disas-
sembled to access them. Figure 3 shows the loca-
tion of these potentiometers on PC4.
Figure 3. PC4 Component Locations
J409
J411
J412
J410
EU OPTION
JUMPERS
J417
J418
J419
DECIMAL POI
JUMPERS (
E
OPTION ON
L
J413 J415
TRI
AD
J
LC
D
TRI
AD
J
R409 R410
R428
R429
TRIP POINT B
AD OPTION
ADJUSTMENT
TRIP POINT A
J404
J406
J405
J407
(OR)(OR)

DDA
Page 7
The Interface Solution Experts
Table 1. Failsafe/Non-failsafe Jumper Settings Table 2. High/Low Alarm Jumper Settings
Table 3. EU Option Display Range Jumper Settings
J404
Installed
Stored
J405
Stored
Installed
J406
Installed
Stored
J407
Stored
Installed
Channel/Mode
A/Failsafe
A/Non-Failsafe
B/Failsafe
B/Non-Failsafe
Display Ranges
0-.200 to 0-.249
0-.250 to 0-.499
0-.500 to 0-.999
0-1.000 to 0-1.999
0-2.00 to 0-2.49
0-2.50 to 0-4.99
0-5.00 to 0-9.99
0-10.00 to 0-19.99
0-20.0 to 0-24.9
0-25.0 to 0-49.0
0-50.0 to 0-99.9
0-100.0 to 0-199.9
0-200 to 0-249
0-250 to 0-499
0-500 to 0-999
0-1000 to 0-1999
J401
Stored
Stored
Installed
Stored
Stored
Stored
Installed
Stored
Stored
Stored
Installed
Stored
Stored
Stored
Installed
Stored
J402
Stored
Installed
Stored
Stored
Stored
Installed
Stored
Stored
Stored
Installed
Stored
Stored
Stored
Installed
Stored
Stored
J403
Installed
Stored
Stored
Stored
Installed
Stored
Stored
Stored
Installed
Stored
Stored
Stored
Installed
Stored
Stored
Stored
J417
Stored
Stored
Stored
Stored
Stored
Stored
Stored
Stored
Installed
Installed
Installed
Installed
Stored
Stored
Stored
Stored
J418
Stored
Stored
Stored
Stored
Installed
Installed
Installed
Installed
Stored
Stored
Stored
Stored
Stored
Stored
Stored
Stored
J418
Installed
Installed
Installed
Installed
Stored
Stored
Stored
Stored
Stored
Stored
Stored
Stored
Stored
Stored
Stored
Stored
Range Jumpers Decimal Point Jumpers
Channel/
Status
A/High
A/Low
B/High
B/Low
J409
Stored
Installed
J413
Stored
Installed
J410
Installed
Stored
J414
Installed
Stored
J411
Stored
Installed
J415
Stored
Installed
J412
Installed
Stored
J416
Installed
Stored
Jumpers

Page 8
DDA
The Interface Solution Experts
Calibration Setup
Table 4 lists the equipment required to calibrate the
DDA.
Figures 4 and 5 (see pages 8 and 9, respectively)
show the calibration hookup required for single- and
dual-alarm units with relay outputs. Figures 6 and 7
(see pages 9 and 10, respectively) show the hookup
required for single- and dual-alarm units with the
TSO Option. Figure 8 on page 10 shows the hookup
required to calibrate a unit with the (DA) Option. The
tables adjacent to each drawing contain the terminal
designations. Use these in conjunction with the cali-
bration drawings to connect the DDA.
Table 4. Calibration Equipment
Figure 4. Calibrating the Single-alarm DDA
Equipment
Adjustable
Current or
Voltage Source
Ohmmeter
DC Voltmeter
(optional)
Milliammeter
(optional)
Power Supply
Screwdriver
Description
Appropriate for the input type and
capable of producing the input range
necessary for the unit (two sources
required for -DA option)
Accurate to within 1%
Voltmeter: accuracy to 0.05% or better
Accuracy of 0.05% or better
24Vdc @ 1A
Slotted-head; head width no greater
than 2.54 mm (0.1 in)
Terminal
Numbers
1
2
9
10
11
12
13
14
15
16
17
18
Terminal
Numbers
+IN
-IN
Manual Reset (Optional)
Manual Reset (Optional)
+ Power
- Power
Normally Open, Contact 1
Common, Contact 1
Normally Closed, Contact 1
Normally Open, Contact 2
Common, Contact 2
Normally Closed, Contact 2
ADDA TRIP
A
D C CURRE NT ALARM
%
+
—
+—
MIL L IAMETER
+
—
ADJUSTABL E
CURRENT / VOL TAGE
INPUT SOURCE
VOL TMETER
NOTES:
1) Either a milliameter or a
dc voltmeter is required
for calibraion, but not both.
2) On actual units, the
terminal numbers appear on
the side of the unit.
3) On most ohmmeters, only
NO or NC can be tested at a
time. Connect the one that is
needed.
4) See adjacent table for
terminal designations.
5) The manual reset
pushbuttons are not supplied
with the DDA, however, they
are required for MR equipped
units.
+IN —IN
12
11 12 13 14 15 16 1718
910
24 VDC
POWER SOURCE
+
—
OHMMETER
See n o t es
See n o t es
See n o t es
OPT IONA L MA NUA L
RESET PUSHBUTTON
( See n o t es)

DDA
Page 9
The Interface Solution Experts
Terminal
Numbers
1
2
9
10
11
12
13
14
Terminal Labels
+IN
-IN
Manual Reset, (Optional)
Manual Reset, (Optional)
+ Power
- Power
+ Transistor Switch Output
- Transistor Switch Output
Figure 5. Calibrating the Dual-alarm DDA
Figure 6. Calibrating Single-alarm DDAs with the Transistor Switch Output Option
Terminal
Numbers
1
2
7
8
9
10
11
12
13
14
15
16
17
18
Terminal Labels
+IN
-IN
Channel B, Manual Reset, (Optional)
Channel B, Manual Reset, (Optional)
Channel A, Manual Reset, (Optional)
Channel A, Manual Reset, (Optional)
+ Power
- Power
Channel A, Normally Open
Channel A, Common
Channel A, Normally Closed
Channel B, Normally Open
Channel B, Common
Channel B, Normally Closed
A
B
DDA
TRIP
TRIP
A
B
INPUT
D C CURRENT ALARM
%
MILLIAMETER
ADJUSTABLE
CURRENT/VOLTAGE
INPUT SOURCE
VOLTMETER
See notes
+IN —IN
12 78910
NN
NN
OO
OO
TT
TT
EE
EE
SS
SS
::::
1) Either a millammeter or a
dc voltmeter is required
for calibration, but not both.
2) On actual units, the
terminal numbers appear on
the side of the unit.
3) On most ohmmeters, only
NO or NC can be tested at a
time. Connect the one that is
needed.
4) See the adjacent table for
terminal desegnations.
5) The manual reset
pushbuttons are not supplied
with the DDA, however they
are required for MR equipped
units.
11 12 13 14 15 16 17 18
24 VDC
POWER
SOURCE
OHMMETER
See notes
See notes
OPTIONAL
MANUAL
RESET
PUSHBUTTON
(See notes)
OPTIONAL
MANUAL
RESET
PUSHBUTTON
(See notes)
—
+
—
+
ADDA TRIP
A
INPUT
D C CURRENT ALARM
%
ADJUSTABLE
CURRENT/VOLTAGE
INPUT SOURCE
12
NN
NN
OO
OO
TT
TT
EE
EE
SS
SS
::::
1) On actual units, the terminal
numbers apear on the side
of the unit.
2) See adjacent table for
terminal designations.
11 12 13 14 15 16 17 18
24 VDC
POWER
SOURCE
—
+
3
ADJUSTABLE
CURRENT/VOLTAGE
INPUT SOURCE

Page 10
DDA
The Interface Solution Experts
Figure 7. Calibrating the Dual-alarm DDA with the Transistor Switch Output Option
Figure 8. Calibrating the DDA with the Deviation Alarm Option
Terminal
Numbers
1
2
7
8
9
10
11
12
13
14
17
18
Terminal Labels
+IN
-IN
Channel B, Manual Reset, (Optional)
Channel B, Manual Reset, (Optional)
Channel A, Manual Reset, (Optional)
Channel A, Manual Reset, (Optional)
+ Power
- Power
+ Channel A, Transistor Switch Output
- Channel A, Transistor Switch Output
+ Channel B, Transistor Switch Output
- Channel B, Transistor Switch Output
Terminal
Labels
+IN
+ Reference
Common
+ Power
- Power
Terminal
Numbers
1
2
3
11
12
A
B
DDA
TRIP
TRIP
A
B
INPUT
D C CURRENT ALARM
%
MILLIAMETER
ADJUSTABLE
CURRENT/VOLTAGE
INPUT SOURCE
VOLTMETER
See notes
12 78910
NN
NN
OO
OO
TT
TT
EE
EE
SS
SS
::::
1) Either a millammeter or a
dc voltmeter is required
for calibration, but not both.
2) On actual units, the
terminal numbers appear on
the side of the unit.
3) See the adjacent table for
terminal designations.
4) The manual reset
pushbuttons are not supplied
with the DDA, however they
are required for MR equipped
units.
11 12 13 14 15 16 17 18
24 VDC
POWER
SOURCE
See notes
POWER
SUPPLY
(60 V, MAX)
VOLTMETER
–
+
VOLTMETER
–
+
–
+– +
+
–
+–
+
–
+
–
OPTIONAL
MANUAL
RESET
PUSHBUTTON
(See notes)
OPTIONAL
MANUAL
RESET
PUSHBUTTON
(See notes)
ADDA TRIP
A
INPUT
D C CURRENT ALARM
%
123
11 12
ADJUSTABLE
CURRENT/VOLTAGE
INPUT SOURCE
ADJUSTABLE
CURRENT/VOLTAGE
INPUT SOURCE
++––
SOURCE B SOURCE A
24 VDC
POWER SOURCE
+–
Notes:
1) On actual units, the terminal
numbers appear on the side
of the unit.
2) See the adjacent table for
terminal designations.
4

DDA
Page 11
The Interface Solution Experts
Calibration Procedures
Note:
Before calibration, partially disassemble the
DDA (see Figures 2 and 3 on pages 5 and
6, respectively).
DA equipped DDAs are calibrated differently than
standard units (see page 12).
To calibrate the DDA:
1. Set jumpers J409 through J416 on PC4
for a high- or low-alarm (see Table 2 on
page 7 and Figure 3 on page 6).
2. Connect the DDA in the correct
calibrationhookup (see Figures4-7on
pages8-10).
3. Turn the Display Control to INPUT.
4. Apply power to the unit.
5. Set the input signal to 0 percent of the
input range. The DDA display should
read 00.0. If not, adjust the Zero
Potentiometer(R409)until00.0is
displayed.
Note:
On EU-equipped DDAs, the display may be
set to any user-selected value less than
1999 by adjusting the Zero potentiometer
(R409) (refer to Table 3 on page 7).
6. Set the input signal source to 100
percent of the input range. The DDA’s
display should read 100.0. If not,
adjusttheSpanPotentiometer(R410)
until 100.0 is displayed (see Figure 3
on page 6).
Note:
For units with the EU option, the display
may be set to any user-selected value less
than 1999 by adjusting the Span
potentiometer (R410) (refer to Table 3 on
page 7).
7. Verify the 0 and 100 percent readings
by repeating steps 5-6. Then apply 25-,
50-, and 75 percent inputs to verify that
the input is linear. If the input is not
linear,repeat steps 5-6.
8. Turn the Display Control to TRIP A.
9. Adjust the TRIP A Potentiometer for a
display reading of the desired trip point
value, as a percent of span.
10. For dual alarm units, turn the Display
Control to TRIP B and repeat step 9
usingtheTRIP B Potentiometer.
11. Turn the Display Control to INPUT and
set the input source to a value outside
thealarmrange.
12. Observe the DDA output (A or B) with
anoutput monitoring device and
increaseor decrease the inputtowards
the trip point setting.
13. Verify the output trips at selected trip
pointsettings by observing thereaction
oftheohmmeter.
14. Increaseanddecreasetheinput
through the trip point setting and verify
that the output changes state.
Note:
Units with the MR Option require manual
resetting after the input has exceeded the
trip point. Reset the trip point manually
after returning to the non-alarm range.
Units with the AR Option will trip after the
input has remained beyond the trip point
setting for the built-in time delay.
Units with the AD Option will reset at a user-
selected setting (see page 12).
15. Disconnectcalibrationequipmentand
re-assembletheDDA.

Page 12
DDA
The Interface Solution Experts
Setting Deadband for AD
Equipped Units
The Adjustable Dead Band (AD) Option provides an
adjustable 1-20 percent deadband. After calibrating
the DDA, deadband is set for AD equipped units by
performing the following steps:
1. TurntheDeadband A Potentiometer
(R429)fullycounterclockwise(see
Figure 3 on page 6).
2. Apply power and an input signal equal
to the desired trip point setting.
3. Slowlyturnthe TRIP A Potentiometer
on the front panel until the unit goes
into an alarm state. Then turn the
DeadbandAPotentiometerfully
clockwise.
4. Apply an input signal equal to the
desired reset point. Slowly turn the
DeadbandApotentiometer
counterclockwiseuntilthealarm
resets (output returns to a non-alarm
state).
5. Increaseand decrease inputthrough
trip point and deadband to verify
reactionofoutput.
6. For dual alarm units, repeat steps 1
through 5 for trip point B using the
TRIP B and Deadband B
Potentiometers
CalibratingaUnitwiththeDAOption
To calibrate units equipped with the DA Option, the
DDA must be set up as shown in Figure 8 on page
10. Two input sources are required for this calibra-
tion procedure.
To calibrate DA equipped units:
1. Set input source A to 100 percent of
input span and source B to 0 percent
of input span.
2. Adjust the Zero Potentiometer to a
displayreading of 00.0.
3. Set input source A to 0 percent of input
span and source B to 100 percent of
inputspan.
4. Adjust the Span Potentiometer for a
displayreadingof 100.0.
5. Set the input sources to the same
values within the input span range.
Verify that the display reading is 50.0.
6. Select another value within the input
span and set both sources to the new
value. Verify that the display reading is
50.0.
7. Change the input settings to various
values and note that the display
changesin proportion to thedifference
in the two inputs by adding or
subtractingthedifferencefrom50.0
percent.
8. Disconnectthecalibrationequipment
andreassembletheDDA.

DDA
Page 13
The Interface Solution Experts
Installation
Installing the DDA consists of physically mounting
the unit and making the appropriate electrical con-
nections.
Mounting the DDA
The standard DDA is designed to mount directly on
a DIN-style, top-hat rail. With the optional DIN-style
G-rail adaptor, the DDA can also be mounted on a
DIN-style G-rail.
To mount the DDA on hat rail, place the upper extru-
sion on the back of the unit over the top edge of the
hat rail. Insert the screwdriver over the bottom edge
of the sliding retainer clip. Pull the clip down until the
unit snaps onto the hat rail.
Figure 9 shows the outline dimensions of the DDA.
Note:
Attention should be given to spacing
beneath the unit to ensure adequate room
for inserting the screwdriver required to
mount and remove the unit (see Figure 9).
Figure 9. Dimensions of the DDA
INSERT SLOTTED SCREWDRIVER
HERE TO REMOVE/MOUNT UNIT
FROM/ONTO RAIL
80 mm
(3.15 in)
60 mm
(2.36 in)
A
B
DDA
TRIP
TRIP
A
B
INPUT
D C CURRENT ALARM
125.73 mm
(4.95 in)
146.05 mm
(5.75 in)
%
OPTIONAL
G RAIL
ADAPTOR
TOP-HAT RAIL
C
L
39.84 mm
(1.57 in)

Page 14
DDA
The Interface Solution Experts
Making the Electrical Connections
All electrical connections are made to removable
blocks across the top and bottom of the front panel.
Terminals are labeled on the top and bottom sur-
faces of the unit with the corresponding connection
for each terminal.
Figures 10-20 on pages 14-21 illustrate typical in-
stallation hookups for the DDA. The tables adjacent
to each drawing contain the terminal designations.
Use these in conjunction with the drawings to install
the DDA.
Recommended Ground
Wiring Practices
Moore Industries recommends the following ground
wiring practices:
• Any Moore Industries product in a metal case
or housing should be grounded.
• All input signals to, and output signals from,
Moore Industries’ products should be wired
using a shielded, twisted pair technique.
Shields are to be connected to an earth or
safety ground at the unit itself.
• The maximum length of unshielded input
and/or output signal wiring should be 2
inches.
• Static control procedures must be used when
the cover or housing is removed from a unit.
CE Conformity
Installation of any Moore Industries products that
carry the CE certification (Commission Electrotech-
nique) must adhere to the guidelines above in order
to meet the requirements set forth in applicable EMC
(Electromagnetic Compatibility) directives
(EN55011, EN 50082-1, EN50082-2, etc.)
Consult the factory for the most current information
on products that have been CE certified.
Operation
Once properly calibrated, connected, and powered,
the DDA will operate reliably for an extended period
of time. Unit maintenance is a simple check of ter-
minal connections every six months. A specific
maintenance schedule for the DDA should be devel-
oped based on the environment in which it is oper-
ated.
If a DDA begins to malfunction or to function below
rated specifications, complete the following checklist
before calling the factory for assistance:
• Verify that all electrical connections are clean
and tight.
• Verify that the power source for the unit is
supplying power at levels rated safe and
appropriate according to product
specifications.
• Verify that the process signal has not changed
dramatically in an unexpected manner.
• Check the calibration of the instruments used
in calibrating the DDA.
• Verify that other devices in the process loop
are not the cause of the problem.
• Verify that input to output isolation still exists.
• If the unit is equipped with the MR option,
verify that the shorting pushbutton is working
properly.
If the difficulties continue, remove the unit from ser-
vice and recalibrate. The removable terminal blocks
on the front panel make it easy to replace the DDA
without having to rewire.

DDA
Page 15
The Interface Solution Experts
Figure 10. Installing the Single-alarm DDA
Figure 11. Installing the Dual-alarm DDA
ADDA TRIP
A
INPUT
D C CURRENT ALARM
%
CURRENT OR
VOLTAGE OUTPUT
DEVICE
+–
12
11 12 13 14 15 16 17 18
24 VDC
POWER
SOURCE +
–
910
CURRENT
DRIVEN
DEVICE
NN
NNOO OOTT TTEE EE::::
1) On actual units, the
terminal numbers appear on
the side of the unit.
2) See the adjacent table
for terminal designations.
3) Manual Reset pushbutton
is not supplied but is
required for —MR equipped
units.
4) The manual reset
pushbutton is not supplied
with the DDA, however it is
required for MR equipped
units.
OPTIONAL
MANUAL
RESET
PUSHBUTTON
(See notes)
CURRENT
DRIVEN
DEVICE
ADDA TRIP
TRIP
A
INPUT
D C CURRENT ALARM
%
CURRENT OR
VOLTAGE OUTPUT
DEVICE
+–
12
11 12 13 14 15 16 17 18
24 VDC
POWER
SOURCE +
–
910
CURRENT
DRIVEN
DEVICE
NN
NNOO OOTT TTEE EE::::
1) On actual units, the
terminal numbers appear on
the side of the unit.
2) See the adjacent table
for terminal designations.
3) The manual reset
pushbuttons are not supplied
with the DDA, however they
are required for MR equipped
units.
BB
78
OPTIONAL
MANUAL
RESET
PUSHBUTTON
(see note)
OPTIONAL
MANUAL
RESET
PUSHBUTTON
(see note)
CURRENT
DRIVEN
DEVICE
Terminal
Numbers
1
2
9
10
11
12
13
14
15
16
17
18
Terminal Labels
+IN
-IN
Manual Reset, (Optional)
Manual Reset, (Optional)
+ Power
- Power
Normally Open, Contact 1
Common, Contact 1
Normally Closed, Contact 1
Normally Open, Contact 2
Common, Contact 2
Normally Closed, Contact 2
Terminal
Numbers
1
2
7
8
9
10
11
12
13
14
15
16
17
18
Terminal Labels
+IN
-IN
Channel B, Manual Reset, (Optional)
Channel B, Manual Reset, (Optional)
Channel A, Manual Reset, (Optional)
Channel A, Manual Reset, (Optional)
+ Power
- Power
Channel A, Normally Open
Channel A, Common
Channel A, Normally Closed
Channel B, Normally Open
Channel B, Common
Channel B, Normally Closed

Page 16
DDA
The Interface Solution Experts
Figure 13. Installing the Dual-alarm DDA with the Transistor Switch Output Option
ADDA TRIP
TRIP
A
INPUT
D C CURRENT ALARM
%
CURRENT OR
VOLTAGE OUTPUT
DEVICE
+–
12
11 12 13 14 17 18
+
–
910
NN
NN
OO
OO
TT
TT
EE
EE
::::
1) On actual units, the
terminal numbers appear on
the side of the unit.
2) See adjacent table for
terminal designations.
3) The manual reset
pushbuttons are not supplied
with the DDA, however they
are required for MR equipped
units.
BB
78
POWER SUPPLY
60V MAXIMUM
+
–
OPTIONAL
MANUAL
RESET
PUSHBUTTON
(See notes)
OPTIONAL
MANUAL
RESET
PUSHBUTTON
(See notes)
–+
VOLTMETER
24 VDC
POWER
SOURCE
Figure 12. Installing the Single-alarm DDA with the Transistor Switch Output Option
ADDA TRIP
TRIP
A
INPUT
D C CURRENT ALARM
%
CURRENT OR
VOLTAGE OUTPUT
DEVICE
+–
12
11 12 13 14 15 16 17 18
24 VDC
POWER
SOURCE +
–
910
NN
NN
OO
OO
TT
TT
EE
EE
::::
1) On actual units, the
terminal numbers appear on
the side of the unit.
2) See the adjacent table for
terminal designations.
3) The manual reset
pushbutton is not supplied
with the DDA, however it is
required for MR equipped units.
POWER SUPPLY
60V MAXIMUM
+–
VOLTMETER
+
–
OPTIONAL
MANUAL
RESET
PUSHBUTTON
(See notes)
Terminal
Numbers
1
2
9
10
11
12
13
14
Terminal Labels
+IN
-IN
Manual Reset, (Optional)
Manual Reset, (Optional)
+ Power
- Power
+ Transistor Switch Output
- Transistor Switch Output
Terminal
Numbers
1
2
7
8
9
10
11
12
13
14
17
18
Terminal Labels
+IN
-IN
B Manual Reset, (Optional)
B Manual Reset, (Optional)
A Manual Reset, (Optional)
A Manual Reset, (Optional)
+ Power
- Power
+ A Transistor Switch Output
- A Transistor Switch Output
+ B Transistor Switch Output
- B Transistor Switch Output

DDA
Page 17
The Interface Solution Experts
Figure 14. Installing the Dual-alarm DDA with the Double-Pole/Single-Throw, Normally Open Relays Option
ADDA TRIP
TRIP
A
INPUT
D C CURRE NT ALARM
%
CURRENT O R
VOLTAGE OUTPUT
DEVICE
+–
12
11 12 13 14 15 16 17 18
24 VDC
POWER
SO URCE +
–
910
CURRENT
DRIVEN
DEVICE
NOTE:
1) On act ual unit s, t he
terminal numbers appear on
the side of the unit .
2) See t he adjacent table for
terminal designat ions.
3) Th e man u al reset
pushbut t ons are not supplied
wit h the DDA, however t hey
are required for MR equipped
unit s.
B
B
78
19 20
OPTIONAL
MANUAL
RESET
PUSHBUTTON
(See not es)
OPTIONAL
MANUAL
RESET
PUSHBUTTON
(See not es)
CURRENT
DRIVEN
DEVICE
Terminal
Numbers
1
2
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Terminal Labels
+IN
-IN
B Manual Reset, (Optional)
B Manual Reset, (Optional)
A Manual Reset, (Optional)
A Manual Reset, (Optional)
+ Power
- Power
Channel A, Normally Open, Contact 1
Channel A, Common, Contact 1
Channel A, Normally Open, Contact 2
Channel A, Common, Contact 2
Channel B, Normally Open, Contact 1
Channel B, Common, Contact 1
Channel B, Normally Open, Contact 2
Channel B, Common, Contact 2

Page 18
DDA
The Interface Solution Experts
Figure 15. Installing the Dual-alarm DDA with the Double-Pole/Single-Throw, Normally Closed Relays Option
A
DDA
TRIP
TRIP
A
INPUT
D C CURRE NT ALARM
%
CURRENT O R
VOLTAGE OUTPUT
DEVICE
+–
12
11 12 13 14 15 16 17 18
24 VDC
POWER
SO URCE +
–
910
CURRENT
DRIVEN
DEVICE
NOTE:
1) On act ual unit s, t he
terminal numbers appear on
the side of the unit .
2) See t he adjacent table for
terminal designat ions.
3) Th e man u al reset
pushbut t ons are not supplied
wit h the DDA, however t hey
are required for MR equipped
unit s.
B
B
78
19 20
OPTIONAL
MANUAL
RESET
PUSHBUTTON
(See not es)
OPTIONAL
MANUAL
RESET
PUSHBUTTON
(See not es)
CURRENT
DRIVEN
DEVICE
Terminal
Numbers
1
2
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Terminal Labels
+IN
-IN
Channel B Manual Reset, (Optional)
Channel B Manual Reset, (Optional)
Channel A Manual Reset, (Optional)
Channel A Manual Reset, (Optional)
+ Power
- Power
Channel A, Normally Closed, Contact 1
Channel A, Common, Contact 1
Channel A, Normally Closed, Contact 2
Channel A, Common, Contact 2
Channel B, Normally Closed, Contact 1
Channel B, Common, Contact 1
Channel B, Normally Closed, Contact 2
Channel B, Common, Contact 2