Pittway NOTIFIER LED-10N User manual

12 Clintonville Road,
Northford, CT 06472
[phone]
FAX: [phone]
A
Document # 50581
12/9/96 Revision:
P/N 50581:A ECN 96-356
The LED-10N
Remote Fire Annunciator
for use with the Notifier
SFP-1024
Fire Alarm Control Panel
www.PDF-Zoo.com

WARNING - Several different sources of power can be
connected to the fire alarm control panel. Disconnect all
sources of power before servicing. Control unit and
associated equipment may be damaged by removing and/
or inserting cards, modules, or interconnecting cables while
the unit is energized. Do not attempt to install, service,
or operate this unit until this manual is read and understood.
CAUTION - System Reacceptance Test after Software
Changes: To ensure proper system operation, this product
must be tested in accordance with NFPA 72-1993 Chapter
7 after any programming operation or change in site-
specific software. Reacceptance testing is required after
any change, addition or deletion of system components,
or after any modification, repair or adjustment to system
hardware or wiring.
All components, circuits, system operations, or software
functions known to be affected by a change must be 100%
tested. In addition, to ensure that other operations are not
inadvertently affected, at least 10% of initiating devices
that are not directly affected by the change, up to a
maximum of 50 devices, must be tested and proper
system operation verified.
This system meets NFPA requirements for
operation at 0-49OC/32-120OF
and at a relative
humidity of 85% RH (non-condensing) at 30O C/86O
F. However, the useful life of the system's standby
batteries and the electronic components may be
adversely affected by extreme temperature ranges
and humidity. Therefore, it is recommended that this
system and its peripherals be installed in an
environment with a nominal room temperature of 15-
27OC/60-80OF.
Verify that wire sizes are adequate for all initiating and
indicating device loops. Most devices cannot tolerate
more than a 10% I.R. drop from the specified device
voltage.
Like all solid state electronic devices, this system may
operate erratically or can be damaged when subjected to
lightning induced transients. Although no system is completely
immune from lightning transients and interferences, proper
grounding will reduce susceptibility. Overhead or outside
aerial wiring is not recommended, due to an increased suscep-
tibility to nearby lightning strikes. Consult with the Technical
Services Department if any problems are anticipated or en-
countered.
Disconnect AC power and batteries prior to removing or
inserting circuit boards. Failure to do so can damage circuits.
Remove all electronic assemblies prior to any drilling, filing,
reaming, or punching of the enclosure. When possible, make
all cable entries from the sides or rear. Before making
modifications, verify that they will not interfere with battery,
transformer, and printed circuit board location.
Do not tighten screw terminals more than 9 in-lbs. Over
tightening 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 wrist strap before handling any
circuits so that static charges are removed from the body. Use
static suppressive packaging to protect electronic assemblies
removed from the unit.
Follow the instructions in the installation, operating, and pro-
gramming manuals. These instructions must be followed to avoid
damage to the control panel and associated equipment. FACP
operation and reliability depend upon proper installation.
Audible warning devices such as bells may not alert people
if these devices are located on the other side of closed or
partly open doors or are located on another floor of a building.
A fire alarm system will not operate without any electrical
power. If AC power fails, the system will operate from
standby batteries only for a specified time.
Rate-of-Rise heat detectors may be subject to reduced
sensitivity over time. For this reason, the rate-of-rise feature
of each detector should be tested at least once per year by
a qualified fire protection specialist.
Equipment used in the system may not be technically
compatible with the control. It is essential to use only
equipment listed for service with your control panel.
Telephone lines needed to transmit alarm signals from a
premise to a central monitoring station may be out of service
or temporarily disabled.
The most common cause of fire alarm malfunctions, how-
ever, is inadequate maintenance. All devices and system
wiring should be tested and maintained by professional fire
alarm installers following written procedures supplied with
each device. System inspection and testing should be sched-
uled monthly or as required by National and/or local fire codes.
Adequate written records of all inspections should be kept.
An automatic fire alarm system - typically made up of smoke
detectors, heat detectors, manual pull stations, audible warn-
ing devices, and a fire alarm control with remote notification
capability can provide early warning of a developing fire. Such
a system, however, does not assure protection against prop-
erty damage or loss of life resulting from a fire.
Any fire alarm system may fail for a variety of reasons:
Smoke detectors may not sense fire where smoke cannot
reach the detectors such as in chimneys, in walls, or roofs, or
on the other side of closed doors. Smoke detectors also may
not sense a fire on another level or floor of a building. A
second floor detector, for example, may not sense a first floor
or basement fire. Furthermore, all types of smoke detectors
- both ionization and photoelectric types, have sensing limi-
tations. No type of smoke detector can sense every kind of
fire caused by carelessness and safety hazards like smoking
in bed, violent explosions, escaping gas, improper storage of
flammable materials, overloaded electrical circuits, children
playing with matches, or arson.
IMPORTANT! Smoke detectors must be installed in the
same room as the control panel and in rooms used by the
system for the connection of alarm transmission wiring,
communications, signaling, and/or power. If detectors are
not so located, a developing fire may damage the alarm
system, crippling its ability to report a fire.
While installing a fire alarm system may make lower insur-
ance rates possible, it is not a substitute for fire insurance!
Fire Alarm System Limitations
Installation Precautions Adherence to the following will aid in problem-free
installation with long-term reliability:
Technical Publishing Document PRECAUSM.PM6 07/12/96
www.PDF-Zoo.com

3
Document 50581 Rev A 12/9/96 P/N 50581:A
Contents
Section One: General Information.................................................................... 4
General .................................................................................................................. 4
Features ................................................................................................................ 4
Figure 1-1: Component Summary ........................................................................ 5
SW1 DIP Switch Settings ..................................................................................... 6
Figure 1-2: SW1 DIP Switch Settings Example .................................................. 6
Figure 1-3: SW2 DIP Switch Settings Example .................................................. 7
Table 1-1: LED-10N Addressing ........................................................................... 8
Figure 1-4: Typical Configuration.......................................................................... 8
Section Two: Operation ...................................................................................... 9
Display Patterns .................................................................................................... 9
Switch Functions................................................................................................... 9
Acknowledge/Step Switch ............................................................................ 9
Silence Switch ............................................................................................ 10
Drill Switch .................................................................................................. 11
System Reset Switch ................................................................................. 11
LED Indicators ............................................................................................ 11
Section Three: Mounting .................................................................................. 12
Figure 3-1: LED-10N Hardware .......................................................................... 12
Figure 3-2: LED-10N Mounting........................................................................... 13
Section Four: LED-10N Electrical Connections ........................................... 14
Figure 4-1: Power Connection ............................................................................ 14
Figure 4-2: LED-10IM Installation ...................................................................... 15
Figure 4-3: EIA-485 Connection......................................................................... 16
Figure 4-4: Wiring FACP to LED-10N................................................................. 17
Section Five: EIA-485 Shield Terminations ................................................... 18
When the EIA-485 Shield is not in Conduit ....................................................... 18
When the EIA-485 Shield is in Full Conduit ...................................................... 19
Spare Slide-In Labels for LED-10N................................................................. 21
www.PDF-Zoo.com

4Document 50581 Rev A 12/9/96 P/N 50581:A
Section One: General Information
General
The Notifier LED-10N is a compact,
attractive LED-type fire annunciator
designed for use with the SFP-1024
Fire Alarm Control Panel.
The LED-10N is capable of display-
ing independent zone
fire alarm,
process monitor alarm, trouble or
supervisory status. It also provides
system status LEDs to display
Power, Alarm, Trouble, Supervisory
and Signals Silenced conditions.
The LED-10N is also capable of
performing system acknowledge,
silence, drill and reset remotely.
Communication between the control panel and the LED-10N is accomplished over a
two-wire serial interface employing the EIA-485 communication standard. Up to 32
LED-10Ns may be connected to the two-wire EIA-485 circuit. The annunciator may be
powered from the host FACP or remote, UL listed, filtered, regulated power supplies.
Features
• Alarm LEDs (red) and Trouble LEDs (yellow) for 10 zones.
• System Status LEDs for Power (green), Alarm (red), Trouble (yellow), Supervisory
(yellow) and Signals Silenced (yellow).
• Local piezo sounder with alarm and trouble resound.
• Distinctly different flash rates for LEDs and piezo sounder distinguish system
status:
ü fire alarm = 1 second on and 1 second off
ü process monitor alarm = 1/4 second on and 1/4 second off
ü supervisory alarm = 1/2 second on and 1/2 second off
• EIA-485 connects to control panel terminal port (requires LED-10IM module).
• Plug-in terminal blocks for ease of installation and service.
• Control buttons and enable key-switch for:
Acknowledge
Signal Silence
Drill
System Reset
• DIP switches control local functions such as piezo enable/disable, control
switches, key-switch enable/disable and transmit/receive mode.
• Up to 32 LED-10Ns per SFP-1024.
• Mounting options:
Surface or semi-flush mounting in standard three-gang electrical box
Can be located up to 6,000 feet from the panel using 18 AWG wire
• Slide-in labels for custom labeling.
• Simple programming at SFP-1024 panel enables communications to LED-10N
annunciators.
General Information
www.PDF-Zoo.com

5
Document 50581 Rev A 12/9/96 P/N 50581:A
Figure 1-1: Component Summary
Current Consumption @ 24 VDC (Regulated and filtered)
Normal/Standby (no activity): 23 mA
Trouble Condition: 31 mA
Alarm: 28 mA (1 zone in alarm)
40 mA (all 10 zones in alarm)
AC Fail: 24 mA
Note: These connections must be power-limited and the +24 volt power (18 VDC to 26 VDC) must be
regulated and filtered.
ROM
Earth Ground Option
-24 VDC OUT
-24 VDC IN
+24 VDC OUT
+24 VDC IN
No connection
+EIA-485
-EIA-485
Shield
No connection
Piezo Sounder
The LED-10N sounder, if enabled, will be activated
when any new alarm or trouble is received from the
panel. It is silenced by the ACKNOWLEDGE or SI-
LENCE switch. Piezo must not be disabled without
approval of LAHJ (Local Authority Having Jurisdiction).
Membrane Connectors
Membrane switch connectors
Side view
(rotated 180
o
from above
[Top] view)
Receive-Transmit/Receive only
not used
LED-10N Address Keyswitch Enable/Disable
Piezo Enable/Disable
Top view
Note: TB1 & TB2 are located
on backside of PCB
General Information
www.PDF-Zoo.com

6Document 50581 Rev A 12/9/96 P/N 50581:A
SW1 DIP Switch Settings
The OPEN position on SW1 is the OFF state. Refer to Figure 1-2 for an explanation of
DIP switch positions. SW1 switch settings are as follows:
1 through 6 - LED10 address switches.
The first six switches are used to set the address of the LED-10N. The OFF
(OPEN) up position equals a binary 1 and the ON down position equals a
binary 0. Refer to Table 1-1 for information on setting these switches for
specific addresses. Each LED-10N connected to the EIA-485 communication
bus must have a unique address.
7 - Not used
8 - ON = Receive/Transmit, OFF (OPEN) = Receive Only
Switch 8 set to ON position enables Receive/Transmit mode for the LED-10N
annunciator. This allows the LED-10N to receive and display system status
information and to transmit system control data such as Acknowledge/Step,
Reset, Signal Silence and Drill. Switch 8 set to the OFF position enables
Receive Only mode which allows the LED-10N to receive and display system
status information but prevents control button operation and supervision status
from being transmitted back to the FACP. To ensure LED-10N supervision and
control button capability, each LED-10N connected to the EIA-485 communica-
tion bus must have a unique address and should be set to enable Receive/
Transmit Mode.
Figure 1-2: SW1 DIP Switch Settings Example
NOTE - SW1 DIP switch settings as illustrated in Figure 1-2 are as follows:
1) DIP switches 1 - 6: Address 08 (see Table 1-1).
2) DIP switch 7: Not used.
3) DIP switche 8: ON = Receive/Transmit
DOWN POSITION = ON UP (OPEN) POSITION = OFF
General Information
www.PDF-Zoo.com

7
Document 50581 Rev A 12/9/96 P/N 50581:A
SW2 DIP Switch Settings
SW2 switch settings are as follows:
1 - ON = Key-switch Enable, OFF = Key-switch Disable.
Switch 1 set to the ON position enables the key-switch operation. The key-
switch may now be used to enable LED-10N membrane (control) switches,
allowing remote switch functions, or lockout the switches, preventing remote
switch functions. Switch 1 set to the OFF position disables the key-switch
operation. Refer to Operation Section for key-switch function description.
2 - ON = Piezo sounder enabled, OFF = Piezo sounder disabled.
CAUTION: Piezo sounder must not be disabled without prior approval of the
Local Authority Having Jurisdiction.
UP POSITION = OFF
DOWN POSITION = ON
LED-10N Addressing
SW1 DIP switches 1 through 6 are used for addressing the LED-10N. Each device
connected to the EIA-485 communication bus must have a unique address. This allows
specific data to be transmitted between the FACP and that device and for individual
supervision of each LED-10N annunciator by the FACP. Switch settings and the
corresponding addresses are shown in Table 1-1. (Address '00' is invalid).
Note: 1 = Switch in the UP (OPEN) position.
0 = Switch in the DOWN position.
Example: ADDRESS SWITCH SETTINGS
1 2 3 4 5 6
08 0 0 1 0 0 0
Addressing Switches
Figure 1-3: SW2 DIP Switch Settings Example
General Information
www.PDF-Zoo.com

8Document 50581 Rev A 12/9/96 P/N 50581:A
ADDRESS SWITCH SETTINGS ADDRESS SWITCH SETTINGS
1 2 3 4 5 6 1 2 3 4 5 6
INVALID 0 0 0 0 0 0 17 0 1 0 0 0 1
01 0 0 0 0 0 1 18 0 1 0 0 1 0
02 0 0 0 0 1 0 19 0 1 0 0 1 1
03 0 0 0 0 1 1 20 0 1 0 1 0 0
04 0 0 0 1 0 0 21 0 1 0 1 0 1
05 0 0 0 1 0 1 22 0 1 0 1 1 0
06 0 0 0 1 1 0 23 0 1 0 1 1 1
07 0 0 0 1 1 1 24 0 1 1 0 0 0
08 0 0 1 0 0 0 25 0 1 1 0 0 1
09 0 0 1 0 0 1 26 0 1 1 0 1 0
10 0 0 1 0 1 0 27 0 1 1 0 1 1
11 0 0 1 0 1 1 28 0 1 1 1 0 0
12 0 0 1 1 0 0 29 0 1 1 1 0 1
13 0 0 1 1 0 1 30 0 1 1 1 1 0
14 0 0 1 1 1 0 31 0 1 1 1 1 1
15 0 0 1 1 1 1 32 1 0 0 0 0 0
16 0 1 0 0 0 0
NOTES:
1) EIA-485: Maximum of 6,000 feet total cable length from FACP to LED-10Ns. Circuit is power-
limited.
2) Up to 32 LED-10Ns may be used on the EIA-485 circuit. The SFP-1024 can power a maximum
of seven LED-10Ns. If additional LED-10Ns are connected, the Notifier FCPS-24 may be used
to supply additional power. (Power supplies used for this purpose must have their negative
terminals commoned together).
3) Between each LED-10N are four wires: A twisted-shielded pair for data communications and a
pair for 24 VDC power.
Figure 1-4: Typical Configuration
Table 1-1: LED-10N Addressing
Typical Configuration
The LED-10N indicates the status of the SFP-1024, while offering multiple annunciator
locations with the capability of remote Acknowledge, Signal Silence, Drill and Reset
functions. The LED-10N displays zone status and requires no programming.
General Information
www.PDF-Zoo.com

9
Document 50581 Rev A 12/9/96 P/N 50581:A
Section Two: Operation
LED Indicators and Piezo Sounder
The LED-10N is an LED annunciator which indicates the system and zone status of its
associated SFP-1024 fire alarm control panel.
AC Power
This is a green LED which illuminates if AC power is
applied to the host FACP. The green LED will turn
off if AC power to the host FACP is lost.
Alarm
This is a red LED that flashes (1 second on, 1
second off) when one or more fire alarms occur.
The piezo sounder turns on steady for alarm. The
LED illuminates steadily when the Acknowledge or
Silence key is pressed and the piezo silences. The
Alarm LED turns off when the Reset key is pressed.
Trouble
This is a yellow LED that flashes (1 second on, 1
second off) when one or more trouble conditions
occur. The piezo sounder pulses (1 second on, 1
second off). The LED turns on steady when the
Acknowledge or Silence key is pressed and the
piezo silences. The LED turns off when all trouble conditions are cleared. This
LED will also illuminate if the microprocessor watchdog circuit within the LED-10N
is activated.
Supervisory
This is a yellow LED that flashes (1/2 second on, 1/2
second off) when one or more supervisory conditions
occur, such as a sprinkler valve tamper condition.
The piezo sounder pulses (1/2 second on, 1/2
second off). The LED illuminates steadily when the
Acknowledge or Silence key is pressed and the piezo silences. The Supervisory
LED turns off when the Reset key is pressed.
Zone Alarm - Zones 1 through 10
This is a red LED that flashes when a fire alarm,
supervisory alarm or process monitoring alarm
occurs on the corresponding zone. The LED flashes
at a 1 second on/1 second off rate for an alarm
condition, a 1/2 second on/1/2 second off rate for a supervisory alarm and a 1/4
second on/1/4 second off rate for a process monitoring alarm. The piezo sounder
will pulse at a rate corresponding to the flashing LED. The LED illuminates steadily
when the Acknowledge or Silence key is pressed and the piezo silences. The LED
turns off when the alarm, process monitoring alarm or supervisory alarm is cleared
on the corresponding zone and the Reset key is pressed.
Note: Be certain to use customized slide-in label to identify the zone function. This
red LED will flash for supervisory conditions if the FACP is not programmed for
Canadian operation. Refer to the SFP-1024 Manual P/N 50475 for details.
Operation
www.PDF-Zoo.com

10 Document 50581 Rev A 12/9/96 P/N 50581:A
Zone Trouble/Supervisory - Zones 1 through 10
This is a yellow LED that flashes when a supervisory
alarm or zone trouble condition occurs on the
corresponding zone. The LED flashes at a 1/2
second on/1/2 second off rate along with the red
zone LED above it for a zone supervisory alarm.
The LED flashes at a 1 second on/1 second off rate for a zone trouble condition.
The piezo sounder will pulse at a rate corresponding to the flashing LED. The LED
illuminates steadily when the Acknowledge or Silence key is pressed and the piezo
silences. The LED turns off when all trouble conditions on the corresponding zone
are cleared. The LED turns off when all supervisory alarms on the corresponding
zone are cleared and the Reset key is pressed.
Note: When the SFP-1024 is programmed for Canadian supervisory annunciation,
only the yellow LED flashes for a supervisory alarm condition. The red LED above
it remains off. Refer to the SFP-1024 Manual P/N 50475.
Key-switch
(shown in Off Position)
Switch Functions
Key-switch
The key-switch is used to enable and
disable the operation of the membrane
(control) switches if switch 1 on DIP switch
SW2 has been placed to the ON position.
To enable the Acknowledge, Silence, Drill
and Reset function keys, insert a standard
Notifier key into the key-switch located at
the top right corner of the LED-10N. Make
certain the key is inserted completely
before attempting to turn it. Turn the key
clockwise until it stops. Leave the key inserted while pressing the function key(s).
When finished with the function keys, turn key-switch counterclockwise to disable
function keys.
Note: The key-switch should normally be in the disabled position (fully counter-
clockwise), with the key removed and access to the key restricted to authorized
personnel only. Do not leave the key unattended in the LED-10N.
Acknowledge
When the Acknowledge key is pressed and
released, the LED-10N sends an Acknowledge
command to the control panel. Pressing the
Acknowledge key silences the local piezo
sounder, the sounders located in all other system
annunciators and the sounder located on the Fire Alarm Control Panel's main circuit
board. It will also change all flashing system LEDs to steady on. Only one press is
necessary regardless of the number of new alarms, troubles or supervisory signals.
An acknowledge message is also sent to the printer and the history files in the SFP-
1024.
Operation
www.PDF-Zoo.com

11
Document 50581 Rev A 12/9/96 P/N 50581:A
Silence
When the Silence key is pressed and released, the
LED-10N sends a Signal Silence command to the
control panel. The Silence key performs the same
functions as the Acknowledge key. In addition, if an
alarm exists, it turns off all silenceable NAC outputs
only and causes the FACP ALARM SILENCE LED
and the LED-10N SIGNAL SILENCE LED to turn on. It also sends an ALARM
SILENCED message to the printer and the history file within the SFP-1024. A
subsequent new alarm will resound the appropriate Notification Appliance Circuits
(NACs) and local sounders.
Drill: Hold 2 Sec.
When the Drill key is pressed and held for at least
two seconds (time required to prevent accidental
activations), the LED-10N will transmit a drill
command to the control panel. This command
causes the FACP to turn on all main panel NAC
outputs. In the event that the system was previously silenced, the drill command
will also turn off the ALARM SILENCE LED. (The Silence key operates on
silenceable NAC outputs only).
Reset
When the System Reset key is pressed and released,
the LED-10N sends a Reset command to the control
panel. This will turn off all Notification Appliance
Circuits, temporarily turns off resettable power to 4-
wire detectors, and sends a "SYSTEM RESET'
message to the FACP display, printer and SFP-1024 history files. It also turns on
all system LEDs, piezo sounders and FACP LED display segments as long as the
Reset key is held (lamp test). Any alarm or trouble that exists after a Reset will
resound the system.
Operation
www.PDF-Zoo.com

12 Document 50581 Rev A 12/9/96 P/N 50581:A
SectionThree: Mounting
LED-10N Preparation
The LED-10N can be surface or semi-flush
mounted ONLY in a three-gang electrical box,
with a minimum depth of 2.75". Select and
remove the appropriate knockout(s), pull the
necessary wires through the knockouts and
mount the three-gang box in or on the wall
depending on the type of installation desired.
Be certain that power is not applied to the
wiring during the installation procedure.
Note: To ensure static protection, all enclosures, including the LED-10N electrical box,
must be connected to earth ground! Never use the shield of the communications wiring
for static protection.
To mount the LED-10N in the electrical box, the trim ring must first be removed. The
trim ring is held in place by two screws inserted through the top and bottom edge as
illustrated above. Removal of the trim ring will expose a metal flange with mounting
holes.
LED-10N Trim ring
Figure 3-1: LED-10N Hardware
Screw
Screw
LED-10N flange
Mounting
www.PDF-Zoo.com

13
Document 50581 Rev A 12/9/96 P/N 50581:A
Mounting to Backbox
Remove the plug-in terminal blocks from the LED-10N circuit board. Connect the EIA-
485 and power wiring into the terminal block positions illustrated in Figures 1-1, 4-1 and
4-2. Plug the terminal blocks back into the TB1 and TB2 connectors on the back of the
LED-10N.
Set DIP switches SW1 and SW2 for the desired options (refer to Figures 1-1 and 1-2
and Table 1-1).
Mount the LED-10N to the three-gang electrical box using the four mounting holes on
the LED-10N flange and the four screws provided for this purpose. Replace the trim
ring and secure with the two screws which were previously removed. Adjust the plastic
trim ring to the surface of the wall before tightening the screws.
Do not overtighten.
Figure 3-2: LED-10N Mounting
LED-10N flange
Mounting Holes (4)
Three-gang electrical
box, 2.75" minimum
depth.
flange
Three-gang electrical box,
2.75" minimum depth.
EIA-485 and power wiring
LED-10N
Mounting
www.PDF-Zoo.com

14 Document 50581 Rev A 12/9/96 P/N 50581:A
Section Four: LED-10N Electrical Connections
The LED-10N can be powered by the SFP-1024 regulated power output or from a
remote, UL listed, filtered, regulated power supply such as the Notifier FCPS-24. The
power run to the LED-10N must be power-limited but need not contain a power supervi-
sion relay since loss of power is inherently supervised through loss of communication
with the LED-10N. Maximum LED-10N current draw from the power supply under alarm
condition is 28 mA. Maximum current draw from the control panel's secondary power
source (batteries) under loss of AC power is 24 mA.
Note: All connections are power-limited and supervised.
Figure 4-1: Power Connection
n/c
Plug-in terminal blocks
Earth Ground Option
LED-10N
+ 24 VDC
- 24 VDC
+ 24 VDC
- 24 VDC
To next annunciator or ACM-8R
From Main Power Supply
LED-10N Electrical Connec- ti
www.PDF-Zoo.com

15
Document 50581 Rev A 12/9/96 P/N 50581:A
LED-10IM
The LED-10IM Interface Module provides an EIA-485 port to support the LED-10N, AFM
Series and LDM Series annunciators as well as the ACM-8R Remote Relay Module and
is therefore required when connecting these devices to the SFP-1024. The SFP-1024
supervises EIA-485 wiring for open circuits via the LED-10IM Interface Module. The
LED-10IM plugs into connector J6 located in the upper right corner of the SFP-1024
main circuit board.
Install the two supplied standoffs into the FACP main circuit board. Ensure that the
metal standoff is installed in the position indicated in the illustration below. Carefully
align the two connectors and press the LED-10IM module securely into place. Make
certain the pins are properly aligned to prevent bending or breaking of any pins. It is
important that the supplied screw and washer be used to secure the module to the
metal standoff. This is necessary in order to help protect against electrical transients.
Note: Refer to the SFP-1024 Manual Programming Section for information on program-
ming the LED-10N into the system.
Figure 4-2: LED-10IM Installation
Metal
Standoff
SFP-1024
LED-10IM
LED-10N Electrical Connec- ti
www.PDF-Zoo.com

16 Document 50581 Rev A 12/9/96 P/N 50581:A
LED-10N
Plug-in terminal blocks
Notes:
1) All connections are power-limited and supervised.
2) A maximum of 32 LED-10Ns may be connected to this circuit.
3) 6,000 feet maximum distance (@ 18 AWG) between the panel and LED-10N(s).
4) Use overall foil/braided-shield twisted pair cable suitable for EIA-485 applications (refer to Section
Five for shield termination information).
5) The EIA-485 circuit is rated at 5.5 VDC maximum and 60 mA maximum.
6) The LED-10N must have the supplied R120 (120 ohm) resistor installed across the EIA-485
terminals on the last or only device connected to the EIA-485 bus as shown. The resistor is
required for impedance matching.
Figure 4-3: EIA-485 Connection
Out to next LED-10N
No connection
Shield
+ EIA-485
- EIA-485
Refer to Note 6
TB2
LED-10N Electrical Connec- ti
www.PDF-Zoo.com

17
Document 50581 Rev A 12/9/96 P/N 50581:A
LED-10IM
EIA-48524 VDC TB2
Terms 1 (+)
and 2 (-)
SFP-1024
LED-10N in grounded box
LED-10N in grounded box
Refer to Note 4
Figure 4-4: Wiring FACP to LED-10N
CAUTION! Please be certain to secure the LED-10IM module to the SFP-1024 and to keep all
wiring from mechanically interfering with the LED-10IM.
Note:
1) Twisted, shielded wire is recommended for the EIA-485 communications loop.
2) Four-conductor, overall shielded wire may be used for the four EIA-485 wires and the two power
wires. It is, however, strongly recommended that the power and communication wires be
separate whenever possible.
3) Refer to Figures 4-2, 4-2 and 4-3 for LED-10N and LED-10IM terminal designations.
4) The LED-10N must have the supplied R120 (120 ohm) resistor installed across the EIA-485
terminals on the last or only device connected to the EIA-485 bus as shown. The resistor is
required for impedance matching.
LED-10N Electrical Connec- ti
www.PDF-Zoo.com

18 Document 50581 Rev A 12/9/96 P/N 50581:A
Section Five: EIA-485 Shield Terminations
The EIA-485 circuit must be wired using a twisted-shielded pair cable having a charac-
teristic impedance of 120 ohms, +/- 20%. Do not run cable adjacent to, or in the same
conduit as, 120-volt AC service, noisy electrical circuits that are powering mechanical
bells or horns, audio circuits above 25 VRMS, motor control circuits, or SCR power circuits
Note: To ensure static (ESD - electrostatic discharge) protection, all enclosures,
including the LED-10N electrical box, must be connected to earth ground! Never use
the EIA-485 shield for this purpose. The EIA-485 shield is for radiated noise emission
protection (RFI, EMI). Refer to the following figures.
The EIA-485 shield should be terminated as follows:
When the EIA-485 shield is not in conduit: The EIA-485 loop allows the FACP to
communicate with the LED-10N(s). The shield for the EIA-485 loop must be
connected to earth ground at the FACP but must be left floating (no connection) at
the LED-10N if it is the first or only device on the EIA-485 loop. If a second LED-
10N is connected, the shield leaving the first LED-10N must be left floating. The
shield entering the second LED-10N must be connected to the 3-gang box or Earth
Ground terminal (TB1-6 & 7) on the second LED-10N. If additional LED-10Ns are
connected, the shield leaving each enclosure must be left floating and the shield
entering each must be connected to the 3-gang box or the Earth Ground Terminal
(TB1-6 & 7) on the LED-10N.
(+) EIA-485
(-) EIA-485
FACP
Shield Drain Wire
Connect the drain wire to the
outside of the SFP-1024 cabinet
via a BX-type connector.
FACP BackboxFACP Backbox
FACP BackboxFACP Backbox
FACP Backbox
EIA-485 Shield Terminations
www.PDF-Zoo.com

19
Document 50581 Rev A 12/9/96 P/N 50581:A
When the EIA-485 shield is in full conduit: The EIA-485 loop allows the FACP to
communicate with the LED-10N(s). The shield for the EIA-485 loop must be
connected to earth ground at the FACP, but must be left floating (no connection) at
the LED-10N if it is the first or only device on the EIA-485 loop. If a second LED-
10N is connected, the shield leaving the first LED-10N must be left floating. The
shield entering the second LED-10N must be connected to the Earth Ground
Terminal (TB1- 6 & 7) on the second LED-10N. If additional LED-10Ns are con-
nected, the shield leaving each LED-10N must be left floating and the shield
entering the following unit must be connected to the Earth Ground Terminal (TB1 -
6 & 7) on the LED-10N.
Caution! Do not allow the floating (no connection) end of the shield to contact the
conduit. The floating end should be insulated from earth ground.
Notes:
1) Power-limited 24 VDC regulated power may be run in the same conduit as the EIA-485 wiring.
2) Twisted, shielded wire is recommended for the EIA-485 communications loop.
3) Each LED-10N electrical backbox is connected to earth ground via the conduit.
4) Shield is connected to the FACP cabinet (earth ground) leaving the FACP.
TB2-1 (+) EIA-485
TB2-2 (-) EIA-485
TB1-6 Earth Ground (IN)
Connect the shield drain wire to the
Earth Ground Terminal on the LED-10N.
LED-10N Box
LED-10N
Shield Drain Wire
EIA-485 Shield Terminations
www.PDF-Zoo.com

20 Document 50581 Rev A 12/9/96 P/N 50581:A
Notes
www.PDF-Zoo.com