AN24 & AN28 ANNUNCIATORS • • • • • • • • • • • • • 8 Field Selectable Sequences All Common ISA Sequences 4 or 8-Point (Channel) Monitoring Free Replaceable Message Labels Type 4X, NEMA 4X, IP65 Front Universal Power Supply 85-265 VAC 12-36 VDC/12-24 VAC Power Option Built-In 85 dB Horn 2 SPDT Relays 24 VDC Isolated Power Supply (AC Models) Multiple-Unit First-Out Indication 3 Pushbutton Operation Sunlight Readable Indication Monitor up to 8 Inputs! DWYER INSTRUMENTS PO Box 373 • Michigan City IN 46361 U
AN24 & AN28 Annunciators Instruction Manual INTRODUCTION The Series AN24/AN28 is a multipurpose panel mounted alarm annunciator. It has 8 field selectable alarm types, including all common ISA sequences. The alarm channels accept normally open, normally closed, NPN open collector transistor, and logic level inputs. Three front panel pushbuttons are used during alarm operation to silence the horn, acknowledge the first out alarm, and reset cleared channels as required by the sequences.
AN24 & AN28 Annunciators Instruction Manual ORDERING INFORMATION 85-265 VAC* Model 12-36 VDC* Model Description AN24-1 AN24-2 4 Channel Annunciator AN28-1 AN28-2 8 Channel Annunciator *All models may be powered from AC or DC, see Specifications for details.
AN24 & AN28 Annunciators Instruction Manual QUICK SETUP GUIDE The following overview details how to set up the annunciator for most common uses. Alarm Selection The two most common alarm types are ISA A and ISA F2A. Select the alarm type using the four-position switch on the rear of the unit above the signal connector. For complete sequence details, see page 31. ISA A ISA F2A NO/NC Inputs Each input can be set for normally open (NO) or normally closed (NC) contacts.
AN24 & AN28 Annunciators Instruction Manual Basic Connections All connections are made to removable screw terminal connectors located at the rear of the instrument. For complete connection details, see page 13. ! Use copper wire with 60°C or 60/75°C insulation for all line voltage connections. Observe all safety regulations. Electrical wiring should be performed in accordance with all applicable national, state, and local codes to prevent damage to the instrument and ensure personnel safety.
AN24 & AN28 Annunciators Instruction Manual Table of Contents INTRODUCTION ------------------------------------------------------------ 2 ORDERING INFORMATION --------------------------------------------- 3 QUICK SETUP GUIDE ---------------------------------------------------- 4 Alarm Selection ------------------------------------------------------------------- 4 NO/NC Inputs ---------------------------------------------------------------------- 4 Basic Connections ----------------------------------------
AN24 & AN28 Annunciators Instruction Manual Relay 2 Operation ------------------------------------------------------------ 24 Relay Fail-Safe---------------------------------------------------------------- 24 Programming Relay Fail-Safe --------------------------------------------- 24 Relay Fail-Safe Programming Example -------------------------------- 25 Relay Operation Overview ------------------------------------------------- 26 Audible Horn Enable/Disable -----------------------------------------------
AN24 & AN28 Annunciators Instruction Manual SPECIFICATIONS Except where noted all specifications apply to operation at +25°C. General DISPLAY AN24; Four red LED channel/point indicators. AN28; Eight red LED channel/point indicators. One green LED power indicator. ALARM MESSAGES Custom printed adhesive clear labels. Area: AN24, 1.25" x .60" (32 mm x 15 mm), 4 messages AN28, 1.25" x .
AN24 & AN28 Annunciators Instruction Manual TIGHTENING TORQUE Screw terminal connectors: Gray: 4.5 lb-in (0.5 Nm) Green: 5 lb-in (0.5 Nm) OVERALL DIMENSIONS 4.68" x 2.45" x 4.19" (62 mm x 119 mm x 106 mm) (H x W x D) WEIGHT 9.6 oz (272 g) WARRANTY 1 year parts & labor Inputs INPUT TYPES UPDATE RATE ALARM TYPES SEQUENCE OPTIONS NO or NC switches: No external excitation required Open collector transistor (NPN): Open circuit voltage approximately 3.3 VDC Logic Levels: LOW = 0 to 0.9 VDC HIGH = 2.
AN24 & AN28 Annunciators Instruction Manual COMPLIANCE INFORMATION Safety UL LISTED USA and Canada UL 508 Industrial Control Equipment UL FILE NUMBER E212517 FRONT PANEL UL Type 4X, NEMA 4X, IP65; panel gasket provided LOW VOLTAGE DIRECTIVE EN 61010-1:2001 (UL 61010C-1) Safety requirements for measurement, control, and laboratory use Electromagnetic Compatibility EMISSIONS EN 55022:1998/A1:2000/A2:2003 Class A ITE emissions requirements (EU) ICES-003 Issue 4 Class A Digital Apparatus emissions re
AN24 & AN28 Annunciators Instruction Manual Power-Frequency Magnetic Field 30 A/m Voltage Dips 70%V for 0.5 period 40%V for 5 & 50 periods Voltage Interruptions 0%V for 250 periods SAFETY INFORMATION ! CAUTION: Read complete instructions prior to installation and operation of the instrument. WARNING: Risk of electric shock. WARNING Hazardous voltages exist within enclosure. Installation and service should be performed only by trained service personnel.
AN24 & AN28 Annunciators Instruction Manual INSTALLATION There is no need to remove the instrument from its case to complete the installation, wiring, and setup. Unpacking Remove the instrument from box. Inspect the packaging and contents for damage. Report damages, if any, to the carrier. If any part is missing or the unit malfunctions, please contact your supplier or the factory for assistance. Panel Mounting • Prepare a standard 1/8 DIN vertical panel cutout – 1.772" x 3.622” (45 mm x 92 mm).
AN24 & AN28 Annunciators Instruction Manual Connections All connections are made to removable screw terminal connectors located at the rear of the instrument. Use copper wire with 60°C or 60/75°C insulation for all line voltage connections. Observe all safety regulations. Electrical wiring should be performed in accordance with all applicable national, state, and local codes to prevent damage to the instrument and ensure personnel safety.
AN24 & AN28 Annunciators Instruction Manual Signal Connections Input signal connections are made to a 14-terminal connector at terminals labeled INPUT CHANNELS on Figure 2. The COM (common) terminal is the return for all types of input signals. Normally Open (NO) or Normally Closed (NC) Switches The following figure shows an example of normally open or normally closed contact inputs.
AN24 & AN28 Annunciators Instruction Manual SIGNAL CONNECTOR CH4 CH3 CH2 C CH1 COM E C B E B NPN Transistor Figure 5. Open Collector NPN Transistor Inputs Logic Level Inputs Each logic level input is connected to an input channel with common as the return. Logic level inputs are factory set for normally high active logic level inputs. For normally low input logic levels, program inputs for normally closed input operation, see page 22. Logic Level Low: 0 to 1.4 VDC Logic Level High: 1.
AN24 & AN28 Annunciators Instruction Manual Switching Inductive Loads The use of suppressors (snubbers) is strongly recommended when switching inductive loads to prevent disrupting the microprocessor’s operation. The suppressors also prolong the life of the relay contacts. Suppression can be obtained with resistor-capacitor (RC) networks assembled by the user or purchased as complete assemblies.
AN24 & AN28 Annunciators Instruction Manual External Input Types The external Silence (SIL), Acknowledge (ACK), and Reset (RST) inputs may be: contacts (i.e. pushbuttons, relay contacts, etc), open collector inputs (OC), or TTL signals. However, throughout this manual, the term “pushbutton” is used to describe these external inputs. Please refer to the chart below for signal logic.
AN24 & AN28 Annunciators UNIT 1 Instruction Manual UNIT 2 UNIT 3 FO FO FO FI FI FI RST RST RST ACK ACK ACK SIL SIL SIL COM COM COM Figure 10. System with Multiple Units Share First-Out SETUP AND PROGRAMMING Overview There are no jumpers involved in the setup process of the annunciator. Alarm type selector switch, located on the rear of the annunciator above the signal connector must be set accordingly for annunciator sequence desired.
AN24 & AN28 Annunciators Instruction Manual Front Panel Pushbuttons and Status LED Indicators Button Description Silence Horn Acknowledge Alarm Reset Clear Input Channels LED Description Red Indicators1 Green Indicator Channel status indicators Indicates power is on. POWER 1. Quantity 4 red LED on the AN24 Quantity 8 red LED on the AN28 SILENCE ACK RESET Pushbutton Descriptions SILENCE Silences the audible alarm without affecting the indication alarm states.
AN24 & AN28 Annunciators Instruction Manual Full Function Test Press and hold SILENCE and ACK for 5 seconds to perform a function test. This tests the alarm operation and hardware by simulating alarm inputs that are cleared in the normal sequence progression. During the function test, all channels enter a simulated alarm state for 3 seconds. All LEDs, pushbuttons, relays, and the audible alarm will follow the selected sequence as if the simulated alarm inputs were real.
AN24 & AN28 Annunciators Instruction Manual Annunciator Alarm Type Selection The alarm type is selected with the DIP switch located above the signal connector. Alarm Type Selector Switch Changing alarm types while the unit is on will restart the unit. Alarm Programming Set switches to the positions shown below for the desired alarm type. The annunciator will immediately automatically restart and operate with the new alarm sequence. Figure 12.
AN24 & AN28 Annunciators Instruction Manual Normally Open/Normally Closed Input Setup Each input channel is independently programmed for a normally open or normally closed input. All channels are initially programmed at the factory for normally open inputs. Alarm Conditions for normally open inputs: 1. A closed contact between an input channel and common will cause an alarm condition. 2. An “on” or active transistor between an input channel and common will cause an alarm condition. 3.
AN24 & AN28 Annunciators Instruction Manual NO/NC Programming Example The following is an example of NO/NC setup. Input channel 1 and 2 are changed from the default settings of NO to be NC inputs. 1. Press and hold ACK and RESET for 3 seconds. When all LEDs cycle, release. 2. Press ACK within 3 seconds. All LEDs blink in unison. 3. Press ACK again while LEDs blink 4. LED 1 will be off indicating a NO input for channel 1. All other LEDs will be dim. 5.
AN24 & AN28 Annunciators Instruction Manual Relay Operation Relays 1 and 2 have standard functionality as defined below. Relay 1 Operation Relay 1 enters alarm state when there is a new alarm. This relay will clear when the alarm is acknowledged, generally by pressing the ACK pushbutton. Relay 2 Operation Relay 2 enters alarm state when any channel displays in alarm state. This relay will clear when all indication LEDs are cleared.
AN24 & AN28 Annunciators Instruction Manual Relay Fail-Safe Programming Example The following is an example of relay fail-safe setup. Relays 1 and 2 are changed from the default settings of normal operation to fail-safe operation. 1. Press and hold ACK and RESET for 3 seconds. When all LEDs cycle, release. 2. Press RESET within 3 seconds of release while LEDs cycle. All LEDs blink in unison. 3. Press RESET again within 3 seconds while LEDs blink 4.
AN24 & AN28 Annunciators Instruction Manual Relay Operation Overview The following figure illustrates the operation of the relays. ON Relay 1 NORMAL OFF ON Relay 2 OFF ON Relay 1 FAIL-SAFE OFF ON Relay 2 OFF Alarm Occurance ACK Pressed Alarms Cleared Relay On: Relay is energized Relay Off: Relay is de-energized. Alarm Occurrence: A new alarm occurs when there is no previous unacknowledged alarm. ACK Pressed: The Acknowledge pushbutton is pressed, acknowledging the alarm.
AN24 & AN28 Annunciators Instruction Manual Audible Horn Enable/Disable The annunciator contains an audible internal horn. This horn may be disabled with the rear-mounted switch located above the signal connector. To enable the horn, move switch 4 to the ON position. To disable the horn, move switch 4 to the OFF position. Sequence F2A Horn Disabled Sequence F2A Horn Enabled Enabling/Disabling Silence Option ISA sequence option 1, Silence Pushbutton, includes a silence pushbutton.
AN24 & AN28 Annunciators Instruction Manual No Lock-In Sequence Option ISA sequence option 4 no lock-in, may be added to any alarm type. Momentary alarms will clear without the ACK pushbutton. Sequences A, F1A, F2A, and F3A will automatically clear any momentary alarm. Sequences M, F1M, and F2M will clear all momentary alarms when the RESET pushbutton is used, regardless of what channels have previously been acknowledged with ACK. Selecting No Lock-In Operation 1.
AN24 & AN28 Annunciators Instruction Manual MOUNTING DIMENSIONS 3.61" (92mm) 4.68" (119mm) 2.50" (64mm) Figure 13. Case Dimensions – Side View 1.76" (45mm) 2.45" (62mm) 3.2" (81mm) 3.6" (91mm) 0.59" (15mm) Figure 14.
AN24 & AN28 Annunciators Instruction Manual TROUBLESHOOTING If the annunciator is not working as expected, refer to the recommendations below. Troubleshooting Tips Symptom Check/Action Power LED off Audible alarm does not sound when alarm state detected Check power at power connector Check: 1. Rear switch position 4 is ON. 2. No external pushbutton contacts on the input connector are shorted. Check that no external pushbutton contacts on the signal connector are shorted to common. Check: 1.
AN24 & AN28 Annunciators Instruction Manual FULL ALARM TYPE DESCRIPTIONS The following section describes the operation of the various sequences available in the alarm annunciator. Features Acknowledge Pushbutton: Momentary alarms will not clear until the alarmed channels have been acknowledged with the ACK pushbutton. This will also reset the first out indication. Used in all ISA sequences. Automatic Reset: Acknowledged momentary alarms will clear automatically when the inputs return to normal.
AN24 & AN28 Annunciators Instruction Manual ISA Sequence A Acknowledge Pushbutton and Automatic Reset Momentary Alarm Maintained Alarm Condition LED Horn Off Off Normal Flash On Alert Flash On Normal ACK Pushbutton Off Acknowledge Off Condition LED Off Normal Flash Alert ACK Pushbutton Acknowledge Steady Off Normal Sequence A Switch Positions Horn Off On Off Off Sequence A Flowchart Condition LED Horn Return to Normal Condition LED Horn Normal Off Off Alarm Condition Ack when Inputs Normal Alert S
AN24 & AN28 Annunciators Instruction Manual ISA Sequence F2A First-Out Indication with Acknowledge Pushbutton and Automatic Reset Momentary Alarm Maintained Alarm Condition LED Horn st 1 Pt Next Pt Off Off Off Normal Flash Steady On Alert Flash Steady On Normal ACK Pushbutton Off Off Off Acknowledge Sequence F2A Switch Positions Condition LED Horn st 1 Pt Next Pt Off Off Off Normal Flash Steady On Alert ACK Pushbutton Acknowledge Steady Steady Off Off Off Off Normal Sequence F2A Flowchart Condition s
AN24 & AN28 Annunciators Instruction Manual ISA Sequence F1A First-Out Indication with Acknowledge Pushbutton, No Lock-In of Subsequent Alarms, and Automatic Reset Momentary Alarm Maintained Alarm Condition LED Horn st 1 Pt Next Pt Off Off Off Normal Flash Steady On Alert Flash Off On Normal ACK Pushbutton Off Off Off Acknowledge Sequence F1A Switch Positions Condition LED Horn st 1 Pt Next Pt Off Off Off Normal Flash Steady On Alert ACK Pushbutton Acknowledge Steady Steady Off Off Off Off Normal Seq
AN24 & AN28 Annunciators Instruction Manual ISA Sequence F3A First-Out Indication with Acknowledge Pushbutton, Automatic Reset, and First-Out Reset Pushbutton Momentary Alarm (RESET before ACK) Condition LED st 1 Pt Next Pt Off Off Normal Intermittent Flash Fast Flash Alert Intermittent Flash Fast Flash Normal RESET Pushbutton st Fast Flash Fast Flash 1 Out Reset ACK Pushbutton Off Off Acknowledge Horn Off On On On Off Momentary Alarm (ACK before RESET) Condition LED st 1 Pt Next Pt Off Off Normal Int
AN24 & AN28 Annunciators Maintained Alarm (ACK before RESET) Condition Instruction Manual LED st 1 Pt Next Pt Off Off Normal Intermittent Flash Fast Flash Alert ACK Pushbutton Slow Flash Steady Acknowledge RESET Pushbutton st Steady Steady 1 Out Reset Off Off Normal Horn Off On Off Off Off Sequence F3A Flowchart Switch Positions Condition st 1 Pt LED Next Pt LED Horn Sequence F3A Normal Off Off Off Alarm Condition Condition Alert st 1 Pt LED Slow Flash Next Pt LED Steady Ack while Horn Off Alarmed Re
AN24 & AN28 Annunciators Instruction Manual Input Follower Indication Simple Indication Condition Normal Alert Normal Switch Positions LED Off Steady Off Horn Off On Off ISA Sequence M Acknowledge and Reset Pushbuttons Momentary Alarm Condition LED Off Normal Flash Alert Flash Normal ACK Pushbutton Steady Acknowledge RESET Pushbutton Off Reset Horn Off On On Condition LED Off Normal Flash Alert ACK Pushbutton Steady Acknowledge Steady Normal RESET Pushbutton Off Normal Off Off Sequence M Switch Pos
AN24 & AN28 Annunciators Instruction Manual ISA Sequence F1M First-Out Indication with Acknowledge and Reset Pushbuttons, and No-Lock-In of Subsequent Alarms Momentary Alarm Maintained Alarm Condition LED Horn st 1 Pt Next Pt Off Off Off Normal Flash Steady On Alert Flash Steady On Normal RESET Pushbutton Flash Off On Reset ACK Pushbutton Off Acknowledge Steady Off RESET Pushbutton Off Off Off Normal Sequence F1M Switch Positions Condition LED Horn st 1 Pt Next Pt Off Off Off Normal Flash Steady On Al
AN24 & AN28 Annunciators Instruction Manual ISA Sequence F2M First-Out Indication with Acknowledge and Reset Pushbuttons Momentary Alarm Maintained Alarm Condition LED Horn st 1 Pt Next Pt Off Off Off Normal Flash Steady On Alert Flash Steady On Normal ACK Pushbutton Acknowledge Steady Steady Off RESET Pushbutton Off Off Off Reset Sequence F2M Switch Positions Condition LED Horn st 1 Pt Next Pt Off Off Off Normal Flash Steady On Alert ACK Pushbutton Acknowledge Steady Steady Off Steady Steady Off Norm
AN24 & AN28 Annunciators Instruction Manual Dwyer Instruments, Inc PO Box 373 Michigan City, IN 46361 USA Tel. (800) 872-9141 • Fax (219) 872-9057 LIM158DW_A.doc SFT043 Ver 1.
