Moore Industries DDA Installation Manual
May 2016
192-720-00 C
DIN-style
Direct Current Alarm
DDA
DIN-style
Direct Current Alarm
DDA
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 and Tables
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
Page 1
DDA
Introduction
Moore Industries’ DIN-style Direct Current alarm, the
DDA, accepts all standard process current and voltage 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
could injure the operator.
Caution
could damage or destroy the unit.
Note
condition, or operation of the unit.
– Hazardous procedure or condition that
– Hazardous procedure or condition that
– Information that is helpful for a procedure,
Description
The DDA is a 4-wire, process alarm that is powered
by an external 24 Vdc power source. It accepts standard process current or voltage (factory-set) and responds 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 (standard), 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 (output A). Standard dual-alarm units have two singlepole, 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 userselected 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 (standard) or G-rail (optional). Refer to the Installation
Section for housing dimensions.
Specifications
Peformance
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 (standard)
Signal Response:
-3dB @ 5Hz typical
(low pass)
Alarm Response:
50 milliseconds
standard
Isolation: 500Vac,
input to output to
power
Peformance
(continued)
Ambient
Temperature
Adjustments
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
Adjustments
(continued)
Indicators
Weight
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)
The Interface Solution Experts
Page 2
DDA
Ordering Information
Unit Input Output Power Options Housing
Current:
DDA
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 jumperselectable)
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.
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.
adjust the deadband to any value between 1 and 20
percent of span. (Not available with MR Option.)
AR Option.
option which causes the output to react to an alarm
condition after a specified time delay. The available
delays are between 1-30 seconds.
Adjustable Deadband.
Alarm Response delay.
Allows you to
A factory-set
DA Option.
Deviation Alarm.
Accepts input from
two sources and then displays a value that is proportional 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 regardless of what the actual value of the inputs are, as
long as they are of equal value. If either input signal 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.
Normally Open relays
DPSTNC Option.
Double-Pole/Single-Throw with
. Requires dual alarms.
DPST Normally Closed relays.
Requires dual alarms.
DPSTNONC Option.
and one normally closed contact per relay.
DPST with one normally open
Requires
dual alarms.
EU Option.
Engineering Units
. Provides userselectable 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 allows for changing the position of the decimal point to
any one of three locations.
The Interface Solution Experts
GR Option.
G-Rail.
(EN50035) G-rail.
Adaptor for mounting on a DIN
Page 3
DDA
HS Option.
28Vdc non-inductive or 1A @ 120Vac non-inductive,
50/60Hz.
MR Option.
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 pushbuttons must be supplied by the user. Toggle or latching switches are not recommended because the
alarm cannot go into an alarm state if the RS terminals are permanently closed.) (Not available with
the AD Option.)
Units equipped with the MR option must be
reset manually after input returns to a non-
TSO Option.
an open-collector transistor output instead of the
standard contact closure relay(s). Can switch 60mA
at 60Vdc maximum.
TX Option.
at 25 mA to drive a process loop directly from the
DDA. (Not available with the DA Option or with 1050 mA input units.)
Hermetically sealed
Manual Reset.
Note:
alarm level.
Transistor Switch Output.
Transmitter Excitation.
relays rated 3A @
A pair of terminals (la-
Provides 24 Vdc
Provides
Calibration
Prior to shipment, every DDA is subjected to rigorous testing by our team of skilled technicians. Every 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 specifications by the factory (factory calibration), it is a good
idea to perform a simple bench check. The procedures 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 environment 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 equipment 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.
The Interface Solution Experts
Page 4
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
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 potentiometer.
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 nonalarm. 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 fl uctuations in the process input.
Deadband is the range in which an alarm relay remains 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 standard 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-energized 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
The Interface Solution Experts
Page 5
DDA
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 Display Control to the position labeled “A” or “B”, respectively. The trip point setting(s) can be varied at
this point by adjusting the corresponding trip point
potentiometer.
Figure 2. Disassembling the DDA
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 singlealarm units. Single-alarm units do not have “B” trip
point potentiometers.
Units equipped with the Engineering Units (EU) Option display the input and trip point values in userspecified units-of-measure.
TRIP
POINT A
LED
LCD
TRIP
POINT B
LED
DISPLAY
CONTROL
PC3
INNER CONNECTING
RIBBON CABLE
TRIP POIN T B
ADJUSTMEN T
TRIP POIN T A
ADJUSTMEN T
PC4
ZERO ADJUSTMENT
SPAN AD JU STM ENT
TRIP POIN T B
AD OPT ION ADJUSTM ENT
TRIP POIN T A
AD OPT ION ADJUSTM ENT
NOTE: D is ass embly is requir ed to acces s
jum pers and i nternal potenti om eter s.
RELEASE TABS
The Interface Solution Experts
Page 6
E
L
J
D
J
DDA
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 operation. Table 3 (see page 7) lists the jumper settings 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 singlealarm 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 Adjustable Dead Band Potentiometers (with AD Option
only) are adjusted internally. These potentiometers
are located on PC4. The DDA must be disassembled to access them. Figure 3 shows the location of these potentiometers on PC4.
Figure 3. PC4 Component Locations
J405
J407
J404
J406
TRIP POINT B
AD OPTION
ADJUSTMENT
TRIP POINT A
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R429
R428
J409
J411
R409
R410
J412
J410
EU OPTION
JUMPERS
DECIMAL POI
OPTION ON
J413
TRI
AD
LC
TRI
AD
J417
J418
JUMPERS (
J415
(OR)(OR)
J419
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