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High-Speed NFN Manual —

 P/N 54013:C4 8/8/2019

Network Configurations

Network Wiring for Ground Fault Detection

3.4  Network Wiring for Ground Fault Detection 

Because the twisted-pair communication link between adjacent nodes is isolated from other nodes through the HS-NCM (transformer 
coupling), a single ground fault on one of the wires will have no effect on circuit operation.

Network ground fault detection from a node power supply may be enabled or disabled with switches on the HS-NCM-W and ONYX-
Works-HNW. Refer to each product’s related documentation for switch designation and ground fault detection setup.

Ground fault detection may be provided by the following:

NFS-3030 or NFS2-3030 node (powered by AMPS-24/E)

NFS2-640, NFS-640, or NFS-320 node (own power supply)

NCA or NCA-2 node powered by Main Power Supply (AMPS-24/E)

DVC-EM node powered by Main Power Supply (AMPS-24/E)

NCD node powered by Main System Power Supply or Auxiliary Power Supply

Point-to-Point Configuration

In a point-to-point configuration, enable ground fault detection on only one side of each point-to-point connection. In Figure 3.4, the left 
node provides the ground fault detection, and thus must be one of the ground fault detection nodes. SW4 on the HS-NCM is set to the 
ON position to enable ground fault detection on the left HS-NCM Port B. The corresponding Port A switch of the right HS-NCM is set 
to the OFF position, disabling ground fault detection for the node on the right. When a ground fault occurs on any HS-NCM connected 
to the network, the ground fault will be detected by the power supply of the HS-NCM with ground fault enabled.

 

If an HS-NCM configured as a repeater is employed, two ground fault detection schemes are possible within a point-to-point configura-
tion. One or both nodes (refer to Figure 3.5 and Figure 3.6) may provide ground fault detection, depending on the number of repeaters 
and the setting of the repeater ground fault detect switch (SW4) at each repeater (refer to EXAMPLES 1 and 2).

EXAMPLE 1:

 In this example, the node on the left provides the ground fault detection, and thus must be one of the ground fault 

detection nodes defined on page 12. S2 (Port B) of the HS-NCM on the left is set to the ON position to enable ground fault 
detection on Port B. The repeater ground fault detection switch (SW4) is ON, allowing the left node to provide ground fault 
detection for the two point-to-point wire connections on the left and right of the repeater. The Port A switch on the right HS-NCM 
is set to the OFF position, disabling ground fault detection from the node on the right. The node on the right can be any network 
node.

.

NOTE:

If both ground fault switches are set to the “OFF” position, ground fault detection for the HS-NCM is completely disabled. 

Completely disabling ground fault detection is not recommended and is not in compliance with UL 864 Standards.

NOTE:

ONYXWorks-HN does not detect ground fault, but ONYXWORKS-HNW can pass the signal between network nodes on either side 

of ONYXWorks. Disabling ground fault detection will prevent signal feed-through.

Network Node

Network Node

Power Supply 

GF Detect 

Enabled

Power Supply

Twisted-Pair Wire

Ports

Ports

GF Detect 

Enabled

GF Detect Dis-

abled

Figure 3.4  Point-to-Point Ground Fault Detection

NF

N

P

T

P

2Pr

v

2

.W

M

F

Power Supply 

GF Detect 

Enabled

Power Supply

Twisted-Pair Wire

Twisted-Pair Wire

Network Node

Network Node

Ports

Ports

Ports

GF Detect 

Enabled

GF Detect Dis-

abled

Figure 3.5  Point-to-Point (EXAMPLE 1)

Содержание Notifier High-Speed NOTI-FIRE-NET

Страница 1: ...Network System Interface High Speed NOTI FIRE NET Instruction Manual Document 54013 Rev C4 8 8 2019 ECN 18 0305 ...

Страница 2: ...vide adequate warning of a fire Smoke detectors cannot be expected to provide adequate warning of fires caused by arson children playing with matches especially in bedrooms smoking in bed and violent explosions caused by escaping gas improper storage of flammable materials etc Heat detectors do not sense particles of combustion and alarm only when heat on their sensors increases at a predetermined...

Страница 3: ...e sides or rear Before making modifications verify that they will not interfere with battery transformer or printed circuit board location Do not tighten screw terminals more than 9 in lbs Over tighten ing may damage threads resulting in reduced terminal contact pressure and difficulty with screw terminal removal This system contains static sensitive components Always ground yourself with a proper...

Страница 4: ...te version for a specific application Documentation Feedback Your feedback helps us keep our documentation up to date and accurate If you have any comments or suggestions about our online Help or printed manuals you can email us Please include the following information Product name and version number if applicable Printed manual or online Help Topic Title for online Help Page number for printed ma...

Страница 5: ...ts 7 2 2 Network Node Features 7 2 3 Network Interface Boards 9 2 4 High Speed Network Communications Modules in Repeater Mode 9 Section 3 Network Configurations 10 3 1 Point to Point Configuration 10 3 2 NFPA Class B Configurations 10 3 3 NFPA Class X Configurations 11 3 4 Network Wiring for Ground Fault Detection 12 Appendix A Compatibility with Other Systems 15 A 1 Honeywell Fire Systems 15 A 2...

Страница 6: ...ith NFPA 72 and or the latest edition of UL 864 These applications will require the approval of the local Authority Having Jurisdiction AHJ NFS 3030 NFS 640 NCA 1 2 Related Documentation This table lists equipment that connects directly to High Speed Noti Fire Net For information about connecting non network devices to these network nodes refer to the installation manual s for your system To obtai...

Страница 7: ...mming enables the DVC to react to events on other network nodes The minimum requirements for a DVC node are a DVC a High Speed Network Communications Module and a 24 VDC filtered power source This power can come from the control panel or from a regulated power limited remote power supply that is listed for Fire Protection Signaling use If local ground fault detection is required an AMPS 24 power s...

Страница 8: ...ire Net network via the internet or intranet allowing the user to view the history event status device properties or other control panel informa tion The NWS 3 interfaces to the internet intranet using an IP based wire ethernet connection NFS 3030 NFS2 3030 With HS NCM W HS NCM MF HS NCM SF HS NCM WSF HS NCM WMF or HS NCM MFSF The NFS 3030 or NFS2 3030 occupy a single node address on the network T...

Страница 9: ...S NCM MF Two multi mode fiber optic cable ports HS NCM SF Two single mode fiber optic cable ports HS NCM WSF One twisted pair wire port one single mode fiber optic cable port HS NCM WMF One twisted pair wire port one multi mode fiber optic cable port HS NCM MFSF One multi mode fiber optic cable port one single mode fiber optic cable port 2 4 High Speed Network Communications Modules in Repeater Mo...

Страница 10: ...Noti Fire Net is capable of communicating using an NFPA Class B SLC refer to Figure 3 1 Under this class of operation a single open wire to wire short wire to wire short and open wire to wire short and ground or open and ground results in fragmenta tion of the network A single ground does not affect communication but is detected Each fragment of the network re configures to per mit communication a...

Страница 11: ...ntioned circumstances while the system displays a trouble condition A single ground does not affect communication but is detected Class X operation may also be achieved using fiber optic cable or mixed media wire and fiber A B A B A B A B These two nodes continue to communicate with each other but cannot communicate with the other two nodes These two nodes continue to communicate with each other b...

Страница 12: ...NCM configured as a repeater is employed two ground fault detection schemes are possible within a point to point configura tion One or both nodes refer to Figure 3 5 and Figure 3 6 may provide ground fault detection depending on the number of repeaters and the setting of the repeater ground fault detect switch SW4 at each repeater refer to EXAMPLES 1 and 2 EXAMPLE 1 In this example the node on the...

Страница 13: ...lt detection is required Figure 3 7 shows how the ground fault detection switches must be arranged in order to achieve this maximum configuration EXAMPLE 4 The HS NCM can be shared between two network nodes In this example the HS NCM is shared between two nodes with separate power supplies Ground Fault detection should only be enabled for one of the power supplies NFNPTP3Prv2 WMF Power Supply GF D...

Страница 14: ...de refer to Figure 3 9 the Ground Fault switch SW4 on the shared HS NCM should be set to OFF The power supply Ground Fault detection for each is dependent on the requirements of their respective network nodes Network Node Network Node Network Node Power Supply GF Detect Dis abled Power Supply GF Detect Enabled Power Supply GF Detect Enabled NUP Port NUP Ports NUP Port GF Detect Enabled Figure 3 9 ...

Страница 15: ...L 864 9th Edition Products A 2 Johnson Controls Fire Systems The following Johnson Controls products will function as nodes on the High Speed Noti Fire Net IFC2 3030 IFC2 640 IFC 320 IFC 3030 IFC 640 JNCA 2 JNCA JDVC EM IFI Workstation These products are compatible with the High Speed NCM as described in this manual A 3 Tyco Unimode Fire Systems The following Tyco Unimode products will function as...

Страница 16: ...16 High Speed NFN Manual P N 54013 C4 8 8 2019 Notes ...

Страница 17: ...OR IMPLIED WITH RESPECT TO THE PRODUCTS TRADEMARKS PROGRAMS AND SERVICES RENDERED BY MANUFACTURER INCLUDING WITHOUT LIMITATION INFRINGEMENT TITLE MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE MANUFACTURER SHALL NOT BE LIABLE FOR ANY PERSONAL INJURY OR DEATH WHICH MAY ARISE IN THE COURSE OF OR AS A RESULT OF PERSONAL COMMERCIAL OR INDUSTRIAL USES OF ITS PRODUCTS This document constitutes th...

Страница 18: ...NOTIFIER 12 Clintonville Road Northford CT 06472 1610 USA 203 484 7161 www notifier com ...

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