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Question posted by jettymain1992 on February 7th, 2023

Nac Eol Fault Tolerance

At what EOL "resistance" does a class B nac output going into open fault or short fault?

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Answer #1: Posted by SonuKumar on February 7th, 2023 9:52 AM

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The end-of-line (EOL) resistance value for a Class B NAC (Notification Appliance Circuit) output depends on the specific product and its design. The Honeywell HPF24S8 product specifications do not specify an EOL resistance value for an open or short fault condition. It is recommended to consult the product manual or contact Honeywell support for more information.

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Related Honeywell HPF24S8 Manual Pages

Installation Instructions - Page 5

......12 Trouble Relay Contact Rating: TB5...12 Secondary Power (battery) Charging Circuit: JP4 12 Special Application Auxiliary Power Output: TB4 Terminals 9 (+) & 10 12 1.7: General...14 Section 2: Installation...15 2.1: Backbox Mounting ...15 2.2: NAC Circuit Wiring...17 2.2.1: Style Y (Class B) ...17 2.2.2: ZNAC-4 Class A Option Module...17 2.3: Addressable Module Mounting ...18 2.4: NEC...

Installation Instructions - Page 9

... fault is an 8 amp power supply. Output circuits may be configured for any one output circuit: 3.0 amps • Maximum total continuous current available: HPF24S Series Power Supplies - Section 1: System Overview The HPF24S6 is a 6 amp power supply and the HPF24S8 is detected, the power supply Normally-Closed Trouble contact will open conditions. Four 24 VDC Style Y (Class B) NACs...

Installation Instructions - Page 10

... - 4.0 amps for HPF24S6 - 6.0 amps for HPF24S8 • Maximum total short term current (one hour maximum): - 6.0 amps for HPF24S6 - 8.0 amps for HPF24S8 • Integral supervised battery charger for lead acid batteries only • Capable of charging 7.0 AH to 18.0 AH (Amp Hour) batteries • Fully supervised power supply, battery and NACs • Selectable Strobe Synchronization for...

Installation Instructions - Page 11

... battery • NAC Trouble (yellow) LED - P/N 52751:D3 5/11/2010 11 Jumper JP1 is located in Normal Mode, if the battery voltage drops too low or the battery is coded (variable voltage), the jumper for zero impedance between the power supply and ground. indicates a charger fault or loss of AC power - indicates a ground fault condition (zero...

Installation Instructions - Page 12

... 12A, 32V) • Maximum Battery Capacity: 18.0 AH • Minimum Battery Capacity: 7.0 AH • Power supply draws maximum standby current of -Line Resistors) or Style Z NACs using the optional ZNAC-4 Class A converter module OR - Maximum total short term current (one hour maximum) for any one circuit - 3.0 amps - Maximum for all output: HPF24S6 - 4.0 amps HPF24S8 - 6.0 amps -

Installation Instructions - Page 13

... Application in NAC Mode NAC/Out 1 + NAC/Out 1 NAC/Out 2 + NAC/Out 2 NAC/Out 3 + NAC/Out 3 NAC/Out 4 + NAC/Out 4 - Sync Input + Sync Input *Note: Auxiliary Power Output is removed.) Figure 1.1 HPF24S Board Layout Trouble Relay Form-C Fail-safe Nonsupervised (shown energized) Normally Open Normally Closed Common JP1 Ground Fault Detection (cut to the power supply. NAC2 + - Battery...

Installation Instructions - Page 14

... Block Diagram One possible application for short and open conditions. During the inactive state, the remote power supply supervises its corresponding output circuits as a door holder circuit which will continue and may be used as programmed by SW1 DIP Switch Settings 24 VDC Specific Application Power NAC Control Input #2 (from FACP) NAC Control Input #1 (from the main FACP...

Installation Instructions - Page 17

...Installation 2.2.1 Style Y (Class B) The standard configuration for NACs is an optional Class A conversion module which mounts to support Style Z (Class A) Notification Appliance Circuits. ZNAC-4 Option Module ZNAC-4 Horn Strobes Alarm Polarity Shown 24fsclsa.cdr J3 HPF24S Circuit Board Figure 2.4 Style Z (Class A) NACs using ZNAC-4 Option Module HPF24S Series Power Supplies -

Installation Instructions - Page 22

... HPF24S8 (max. The power supply is also a limit to the FACP sync output connector instead of Strobes for Synchronization The total current draw for each Notification Appliance Circuit cannot exceed 3.0 amps. Following is not exceeded. strobes) 51 40 39 3.2.2 Synchronization Mode - DIP switches 1 and 2 are created by monitoring very short timing pulses on the existing NAC...

Installation Instructions - Page 23

.... In addition, the operation of AC power. In addition, the Aux. In addition, if the Auxiliary Power output is present on page 25 for 2 hours...NACs will allow the HPF24S to generate a trouble signal immediately on the power supply. • DIP switch 4 set to Section 4.1.2, "Supervision of HPF24S Faults", on the Sync Input circuit, the power supply will delay the generation of AC power...

Installation Instructions - Page 25

...NAC trouble. An open or short anywhere on the control panel's NAC or power supply NAC will cause the trouble contact to open circuit condition on the NAC output of the power supply • An AC fail condition at the power supply... The contacts can be detected at the power supply • A battery charger fail on the power supply • A ground fault condition on the setting of FACP to ...

Installation Instructions - Page 26

...regardless of the setting of SW1 DIP switch 4. 26 HPF24S Series Power Supplies - A field wiring fault on the NAC output of the power supply. (If the panel is in sequence. SLC Monitor Module ELR...numbers in alarm, only a short circuit on the power supply (zero impedance between the power supply and ground) - P/N 52751:D3 5/11/2010 NOTE: the NAC Trouble LED will change states ...

Installation Instructions - Page 28

... 5: Applications 5.1 Controlling Four NACs With One Input and Selective Silence NOTE: The Relay Module is provided by an EOL relay. In Slave mode, selective silence (horn mute) is required only for this application, the power supply has been set as a master with the power supply set as Master. In this application with synchronized outputs and selective silence...

Installation Instructions - Page 29

... under screw terminals. The module could be 7 = OFF (charger enabled) mounted on the power supply 8 = OFF (circuit 4 NAC function) Relay Module* Control Module* EOL Power Supervision Relay inside the cabinet. EOLR-1 *If the SLC device does not match the one in alarm, then opens when silence is connected between TB4 Terminal 7 (IN2 +) and Terminal 9 (Aux. The...

Installation Instructions - Page 30

... EOL relay (P/N: A77-716B) 6. IMPORTANT! If the terminals are not jumpered as indicated, the horn portion of compatible devices, refer to Terminal 10 (AUX-). P/N 52751:D3 5/11/2010 When the power supply is programmed for control module wiring supervision (the ELR value is dependent on TB4, Terminals 9 & 10 with synchronized outputs. Applications Controlling Three NACs...

Installation Instructions - Page 33

...HPF24S Series Power Supplies - Power output of the power supply can be set for FACP NAC wiring supervision (the ELR value is dependent on page 32. 1. The power supply must be used as the Aux. Remote Supply With Resettable and Nonresettable Power Applications Notes: The following notes apply to Figure 5.3 on the NAC). 4. An End-of continuous current and the HPF24S8 can...

Installation Instructions - Page 34

... 4 NAC) Figure 5.4 Remote Power Supply Application Notes: The following notes apply to in note 1. 3. An End-of -Line Resistor referred to Figure 5.4 on the module employed). 2. The Normally Closed (when energized) power supervision relay contact must be installed between TB4, Terminals 5 & 6. HPF24S SLC Power Output 4 Nonresettable Power Output 3 Nonresettable Power Output 2 Resettable...

Installation Instructions - Page 37

... 5.7 Canadian Applications Canadian applications, per ULC, require the following: • The HPF24S power supply must monitor for type V and type H modules. NAC Outputs only Cut JP1 24fsCanadiantpH.wmf Battery - P/N 52751:D3 5/11/2010 37 The Ground Fault Detection circuit on the HPF24S power supply must be disabled by cutting jumper JP1. • the negative (-) battery terminal of...

Installation Instructions - Page 42

... 190 119 75 151 95 59 37 1.07 276 174 109 69 138 87 55 34 Table A.1 NAC Wiring Requirements for Power Supply Calculations are based on Direct-Current Resistance data for the HPF24S6 and HPF24S8 Field Charger Power Supply. Appendix A: Wire Requirements Connecting external system accessories to the main circuits must be carefully considered to use...

Installation Instructions - Page 49

... Appliance Circuit see also NAC 9 O output circuit types 12 maximum current 3.0 amps 12 output circuit current 12 maximum current 9 see also NAC output 12 Style 12 voltage rating 12 output power 9 P Power nonresettable 9 resettable 9 power supply board layout drawing 13 connectors and jumpers 13 power supply requirements 38 powering supply 38 power-limited 9 power-limited wiring 19 R relay...