Ordering Information could result in personal injury or property loss. Anyone using this product for such applications 85-265 VAC* 12-36 VDC* does so at his/her own risk. Dwyer Instruments, Description Model Model Inc shall not be held liable for damages resulting from such improper use.
AN24 & AN28 Annunciators Instruction Manual Quick Setup Guide Basic Connections The following overview details how to set up the All connections are made to removable screw annunciator for most common uses. terminal connectors located at the rear of the instrument.
AN24 & AN28 Annunciators Instruction Manual Specifications Input Input Types NO or NC switches: No external Except where noted all specifications apply to operation at +25°C. excitation required General Open collector transistor (NPN): Open circuit voltage approximately AN24; Four red LED channel/point Display 3.3 VDC indicators.
AN24 & AN28 Annunciators Instruction Manua Compliance Information Installation There is no need to remove the instrument from its Safety case to complete the installation, wiring, and setup. UL Listed USA and Canada UL 508 Industrial Control Equipment Unpacking UL File Number E212517 Front Panel UL Type 4X, NEMA 4X, IP65;...
AN24 & AN28 Annunciators Instruction Manual Connectors Labeling Dimensions The connectors label, affixed to the instrument, shows All units: inches [mm] the location of all connectors available with requested configuration. 3.56" 4.18" (91mm) (106mm) Figure 4. Connector Labeling for AN24-1 2.50"...
AN24 & AN28 Annunciators Instruction Manual Open Collector NPN Transistor Power Connections Each transistor collector is connected to a separate Power connections are made to a two-terminal input channel and all emitters connected to common. connector labeled POWER. See Connectors Labeling All channels are factory set for transistor inputs on page 8.
AN24 & AN28 Annunciators Instruction Manual Multiple Unit First-Out Indication Switching Inductive Loads Connections The use of snubbers to suppress electrical noise is strongly recommended when switching inductive loads Multiple AN28 and AN24 units can keep a single first- to prevent disrupting the microprocessor’s operation. out channel indicated for all connected units.
AN24 & AN28 Annunciators Instruction Manua Setup and Programming Pushbutton Descriptions SILENCE Overview Silences the audible alarm without affecting the indication sequence states. This pushbutton may be There are no jumpers involved in the setup process disabled (see Audible Horn Enable/Disable, page 14). of the annunciator.
AN24 & AN28 Annunciators Instruction Manual Annunciator Sequence Normally Open/Normally Closed Selection Input Setup The alarm sequence is selected with the DIP switch Each input channel is independently programmed for located above the signal connector. a normally open or normally closed input. All channels are initially programmed at the factory for normally Changing sequences while the unit is on will restart open inputs.
AN24 & AN28 Annunciators Instruction Manual Relay Operation NO/NC Programming Example The following is an example of NO/NC setup. Input Relays 1 and 2 have standard functionality as defined channel 1 and 2 are changed from the default settings below. of NO to be NC inputs.
AN24 & AN28 Annunciators Instruction Manual Relay Operation Overview Relay Fail-Safe Programming Example The following figure illustrates the operation of the The following is an example of relay fail-safe setup. relays. Relays 1 and 2 are changed from the default settings of normal operation to fail-safe operation.
AN24 & AN28 Annunciators Instruction Manua Note: LED 1 and 2 are used for relay fail-safe setup Silence Pushbutton (see page 13), and LED 3 is used for silence Enable/Disable pushbutton enable/disable (see page 14). Press and hold ACK and RESET for 3 The unit will automatically leave setup mode if steps seconds until all LEDs cycle, then release.
AN24 & AN28 Annunciators Instruction Manual Full Sequence Descriptions ISA Sequence A The following section describes the operation of the Acknowledge Pushbutton and Automatic Reset various sequences available in the Series AN24/AN28 alarm annunciator. Momentary Alarm Maintained Alarm Condition Horn Condition Horn Features...
AN24 & AN28 Annunciators Instruction Manual ISA Sequence F2A ISA Sequence F1A First-Out Indication with Acknowledge Pushbutton First-Out Indication with Acknowledge Pushbutton, No and Automatic Reset Lock-In of Subsequent Alarms, and Automatic Reset Momentary Alarm Momentary Alarm Condition Horn Condition Horn Next Pt Next Pt...
AN24 & AN28 Annunciators Instruction Manua Input Follower Indication ISA Sequence F1M Switch Simple Indication First-Out Indication with Acknowledge and Reset Positions Condition Horn Pushbuttons, and No-Lock-In of Subsequent Alarms Normal Momentary Alarm Alert Steady Condition Horn Normal Next Pt Normal ISA Sequence M Alert...
AN24 & AN28 Annunciators Instruction Manual ISA Sequence F2M Sequence F2M Flow Chart First-Out Indication with Acknowledge and Reset Pushbuttons Condition Normal Pt LED Momentary Alarm Next Pt LED Condition Horn Horn Next Pt Reset Alarm Condition Normal while Normal Alert Flash Steady...
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