TWR Lighting E-1DBSL User manual

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
4300 WINDFERN RD STE 100 HOUSTON TX 77041-8943
VOICE: 713-973-6905 FAX: [phone]
web: www.twrlighting.com
IMPORTANT!!!!
PLEASE TAKE THE TIME TO FILL OUT THE FORM COMPLETELY.
FILEINASAFEPLACE. INTHEEVENTYOUEXPERIENCEPROBLEMS
WITH ORHAVEQUESTIONSCONCERNINGYOURCONTROLLER, THE
FOLLOWING INFORMATION IS NECESSARY TO OBTAIN PROPER
SERVICE AND PARTS.
MODEL # ________E-1DBSL
SERIAL #
PURCHASE DATE
PURCHASED FROM

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
TABLE OF CONTENTS
1.0 INTRODUCTION..............................................................................................................1
1.1 APPLICATION .......................................................................................................1
1.2 SPECIFICATIONS OF EQUIPMENT....................................................................1
2.0 INSTALLATION...............................................................................................................2
2.1 POWER SUPPLY CONTROL CABINET MOUNTING.......................................2
2.2 PHOTOCELL HOUSING .......................................................................................2
2.3 PHOTOCELL WIRING ..........................................................................................3
2.4 POWER WIRING....................................................................................................3
2.5 TOWER LIGHTING KIT........................................................................................4
2.5.1 LED Red Beacon Mounting and Wiring ..................................................4
2.5.2 Tower Kit Wiring......................................................................................6
2.6 ALARM WIRING .................................................................................................7
2.6.1 White Strobe Failure (SF).........................................................................8
2.6.2 Lights On (LO) .........................................................................................8
2.6.3 Power Failure (PF)....................................................................................8
2.6.4 LED Red Beacon Burnout (BB)...............................................................8
2.6.5 Sidelight Failure (SL) ...............................................................................8
2.7 ALARM TESTING................................................................................................9
2.7.1 White Strobe Failure (SF).........................................................................9
2.7.2 Lights On (LO) .........................................................................................9
2.7.3 Power Failure (PF)....................................................................................9
2.7.4 LED Red Beacon Burnout (BB)...............................................................9
2.7.5 Sidelight Failure (SL)98
3.0 THEORY OF OPERATION ..........................................................................................10
3.1 THE POWER SUPPLY ......................................................................................10

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
3.2 THE FLASHTUBE................................................................................................11
3.3 LED BEACON ......................................................................................................11
3.4 TIMING CIRCUIT................................................................................................11
3.5 TRIGGER CIRCUIT.............................................................................................11
3.6 ALARM CIRCUITS..............................................................................................11
3.6.1 White Strobe Failure (SF).......................................................................11
3.6.2 LED Red Beacon Burnout (BB).............................................................11
3.6.3 Power Failure (PF)..................................................................................12
3.6.4 Sidelight Failure (SL) .............................................................................12
3.7 BLEEDER CIRCUIT.............................................................................................12
3.8 DIAGNOSTIC CIRCUITS....................................................................................13
3.8.1 Control Power On...................................................................................13
3.8.2 High Voltage...........................................................................................13
3.8.3 Trigger Voltage.......................................................................................14
3.8.4 Nightmode...............................................................................................14
3.8.5 Primary Timing.......................................................................................14
3.8.6 Timing Signal Verify..............................................................................15
3.8.7 Flash Verified .........................................................................................15
3.8.8 Strobe Fail Test.......................................................................................15
4.0 TROUBLESHOOTING..................................................................................................16
4.1 TOOL REQUIREMENTS.....................................................................................16
4.2 DIAGNOSTIC EVALUATION............................................................................16
4.3 TROUBLESHOOTING ASSISTANCE................................................................17
4.3.1 Strobe Flash Verify LED - Out...............................................................17
4.3.2 Control Power on LED - Out..................................................................18
4.3.3 Primary Timing LED - Out.....................................................................18
4.3.4 False or Nonexistent Beacon Alarm (SF)...............................................18
4.3.5 LED/BEACON/Flasher Failure..............................................................18

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
5.0 MAINTENANCE GUIDE...............................................................................................20
5.1 FLASHTUBE REPLACEMENT ..........................................................................20
5.2 RED OBSTRUCTION LIGHTING.......................................................................21
5.3 PHOTOCELL........................................................................................................21
6.0 MAJOR COMPONENTS LIST
7.0 SUGGESTED SPARE PARTS LIST
WARRANTY & RETURN POLICY
RETURN MERCHANDISE AUTHORIZATION (RMA) FORM

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
APPENDIX
CHASSIS LAYOUT............................................................................................ H40-264 (Rev. O)
WIRING DIAGRAM........................................................................................... MO1-264 (Rev. I)
HOUSING DETAIL...........................................................................................HDO-264 (Rev. C)
INSTALLATION GUIDELINE..........................................................................................INS-264
PHOTOCELL HOUSING DETAIL.......................................................................100239 (Rev. A)
TOWER LIGHTING KIT 201’ TO 350’ CABLE........................................................602 (Rev. C)
SIDELIGHT MOUNT ASSEMBLY …………………………………………….100489
(REV.A)
TIMING/CONTROL PCB................................................................................. H01-226B (Rev. F)
HIGH VOLTAGE RECTIFIER PCB............................................................... H02-226A (Rev. A)
RELAY PCB w/ALARM LOCKOUT ELIMINATION MODIFICATION .................. H03-264A
OL1VLED2 (L810 OBSTRUCTION LIGHT).......................................................100656 (Rev. A)
LED BEACON AND SIDELIGHT CURRENT SENSOR....................................100694 (Rev. A)
L865/864 LED DUAL BEACON ASSEMBLY ...................................................................100604
JUNCTION BOX DETAIL....................................................................................100089 (Rev. A)

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
1.0 INTRODUCTION
The TWR Lighting, Inc. (TWR) Model E-1DBSL Type L-864/L-865 Controller has been
designed and built to the Federal Aviation Advisory Circular 150/5345-43E, with safety and
reliability in mind. TWR is committed to providing our customers with some of the best
products and services available. TWR welcomes you to our family of fine products and we
look forward to servicing your needs now and in the future.
1.1 APPLICATION7
The E-1DBSL Controller is for use on lighting structures or towers (201' to 350'
AGL) that are approved to be lighted with Dual Red “LED”/ White “Strobe” Flashing
Medium Intensity in accordance with the Federal Aviation Administration's (FAA)
Advisory Circular 70/7460-1K.
1.2 SPECIFICATIONS OF EQUIPMENT
Dimensions:
Controller (H X W X D) / Weight 18.0" X 16.0" X 9.25" / 45.0 lbs
Mounting Dim (H X W) 18.74" X 12.0"
Beacon Height / Weight 27.0" / 80 lbs
Cable Diameter / Weight per 100 ft. .625" +/- 10% 24 lbs
Electrical Voltage: 120V AC +/- 10% 60 Hz (Standard)
240V AC +/- 10% 60 Hz (Available)
Intensity:
White Daymode 20,000 +/- 25% Effective Candelas
Red Nightmode 2,000 +/- 25% Effective Candelas
White Nightmode (Back-up mode) 2,000 +/- 25% Effective Candelas
Beam Spread:
Horizontal 360°
Vertical 3°Minimum
Flash Rate:
White Daymode 40 fpm +/- 2 fpm
Red Nightmode 30 fpm +/- 2 fpm
White Nightmode (Back-up mode) 40 fpm +/- 2 fpm
Wattage:
Daymode 95 Watts
Red Nightmode 145 Watts
White Nightmode 35 Watts
Temperature: +55°C / -55°C
Beacon Wind Load: 2.1 ft2
1

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
2.0 INSTALLATION
WARNING DANGER!!!
THIS SYSTEM OPERATES AT HIGH VOLTAGE LEVELS THAT COULD BE
LETHAL TO SERVICE PERSONNEL. ALL INSTALLATION AND
MAINTENANCE WORK MUST BE DONE BY QUALIFIED SERVICE
PERSONNEL ONLY. WHEN PERSONNEL IS INSTALLING SYSTEM OR
PERFORMINGMAINTENANCE ON THISSYSTEM, MAKE SURETHE POWER
IS TURNED OFF AT THE SERVICE BREAKER PANEL!!
READ AND UNDERSTAND THE THEORY OF OPERATION AND ITS SAFETY
MESSAGESBEFORE ATTEMPTINGINSTALLATION/MAINTENANCEOFTHIS
SYSTEM. DO NOT ATTEMPT TO DEFEAT THE INTERNAL SAFETY
SWITCHES IN THE CONTROLLER AND STLDBEACON!!
2.1 POWER SUPPLY CONTROL CABINET MOUNTING
The power supply control cabinet can be located at the base of the structure or in an
equipment building. Mounting dimensions can be found in Section 1.2, on page 1.
Pay particular attention when choosing your controller mounting location to ensure
proper door opening and room for service personnel. Refer to installation drawings
INS-264, and HDO-264, for ease of install.
2.2 PHOTOCELL HOUSING
The standard photocell housing is supplied with a 20' pigtail of 16 AWG type TFFN
wire. On occasion in mounting of the photocell an additional amount of wire may be
required. Refer to drawing 100239, for proper assistance on determining gauge of
wire for your specific needs.
2

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
2.3 PHOTOCELL WIRING (Refer to Drawings HDO-264 and H40-264)
If the control cabinet is mounted inside an equipment building, the photocell should
be mounted vertically on ½” conduit outside the building above the eaves facing
north. Wiring from the photocell housing socket to the control cabinet should consist
of one (1) each; red, black, and white wires. The white wire is connected to the
socket terminal marked "N," the black wire is connected to the socket terminal
marked "L," and the red wire is connected to the socket terminal marked "LO." The
photocell should be positioned so that it does not "see" ambient light, which would
prevent it from switching to the nightmode. If the control cabinet is mounted outside
an equipment building, the photocell should be mounted vertically on ½” conduit so
the photocell is above the control cabinet. Care must be taken to assure that the
photocell does not "see" any ambient light that would prevent it from switching into
the nightmode. The photocell housing socket wiring is the same as above.
2.3.1 Connect the BLACK wire from the photocell to TB1-6.
2.3.2 Connect the RED wire from the photocell to TB1-7.
2.3.3 Connect the WHITE wire from the photocell to TB1-8.
2.3.4 Install the photocell into the receptacle and twist to the right while depressing
to lock into place.
2.4 POWER WIRING (Refer to Drawing H40-264)
Power wiring to the control cabinet should be in accordance with local methods and
the National Electric Code (NEC).
2.4.1 A 15 amp circuit breaker is recommended at service panel.
2.4.2 Connect the "HOT" side of the 120V AC line to TB1-9.
3

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
2.4.3 Connect the "NEUTRAL" side of the 120V AC line to TB1-10.
2.4.4 Connect the AC ground to the ground stud to the lower right of the terminal
block TB1.
2.4.5 Controller panel should be connected to the tower and/or building grounding
system with the exception of installations on AM RF applications where
controller grounding to earth ground is prohibited. Ground the controller
only to the tower itself using a suitable RF ground.
2.5 TOWER LIGHTING KIT
When installing this system, the customer will need to use strobe cable wiring
method to wire the STLDBEACON. Refer to tower kit drawing 602, for cable
installations. WARNING DANGER!!!
THIS SYSTEM OPERATES AT HIGH VOLTAGE LEVELS THAT COULD
BE LETHAL TO SERVICE PERSONNEL. ALL INSTALLATION AND
MAINTENANCE WORK SHOULD BE DONE BY QUALIFIED SERVICE
PERSONNEL ONLY. WHEN PERSONNEL IS INSTALLING SYSTEM OR
PERFORMING MAINTENANCE ON THIS SYSTEM, MAKE SURE THE
POWER IS TURNED OFF AT THE SERVICE BREAKER PANEL!!
READ AND UNDERSTAND THE THEORY OF OPERATION AND ITS
SAFETY MESSAGES BEFORE ATTEMPTING INSTALLATION/MAIN-
TENANCE OF THIS SYSTEM. DO NOT ATTEMPT TO DEFEAT THE
INTERNAL SAFETY SWITCHES IN THE CONTROLLER AND
STLDBEACON!!
2.5.1 LED Red Beacon Mounting and Wiring (Refer to Drawings HDO-264, and
INS-264)

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
4
2.5.1.1 Bolt the STLDBEACON to the mounting plate using four 5/8" x 1
1/4" galvanized bolts that are supplied. Installer should make sure
to check for full thread engagement on Anco locknut. Allow 16"
clearance in back of the hinge (25" from the center of the base) to
tilt lens back without hitting an obstruction.
2.5.1.2 Level the STLDBEACON using the spirit level at the base of the
lens. Shims may be used under beacon base or triple nutting each
bolt with palnuts on all four (4) nuts.
2.5.1.3 Slip the electrical cable for the STLDBEACON through the
watertight connector (cable gland bushing), and tighten the gland
nut to make a watertight seal. Attach the wires to the terminal
strip as follows:
Connect Cable To Lamp platform Terminal
Wire Color Match Wire Color Block Number
10 Gauge Red 16 Gauge Red 1
14 Gauge White/Green 16 Gauge White/Green 2
16 Gauge Brown 16 Gauge Brown 3
16 Gauge Blue 16 Gauge Blue 4
10 Gauge Black 16 Gauge Black 5
14 Gauge White 16 Gauge White 6
14 Gauge Green 16 Gauge Green 7
10 Gauge Red/Black 16 Gauge Red/Black 8
16 Gauge Bare Wire Beacon Base
5

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
2.5.2 Lighting Kit Wiring
Install wiring between the controller and the beacon utilizing strobe cable.
(TWR LIGHTING CANNOT WARRANTY SYSTEMS THAT
EMPLOY SPLICING CABLE.) Refer to drawings HDO-264 and 602 for
installation of light kits. Following these minimum guidelines, as well as any
local or end user additional requirements, installing light kits will require
lifting of the cable by the supplied cable grip or conduit to affix to the tower.
Always work safely and adhere to all OSHA Safety Guidelines when lifting
wiring or working on the structure or tower itself. It is the installer’s
responsibility to install the lighting kit in a safe manner. Installers can
request from OSHA their requirements 29CFT 1926.21, and 29CFR
1926.105, to ensure compliance to regulations.
NOTE: On occasion, a set of custom lighting kit drawings may be
specificallyrequested by acustomer and installedin this manual. Incases
such as this, the drawings will precede the manual if a conflict occurs.
All the necessary information for wiring the STLDBEACON and sidelights
is contained on the tower kit drawing 602. The connections for the
STLDBEACON and sidelights in the controller are as follows:
2.5.2.1 Connect the 10 gauge Red/Black wire from STLDBEACON
wiring to TB1-1.
2.5.2.2 Connect the 10 gauge Blackwire from STLDBEACON wiring to
TB1-2.
2.5.2.3 Connect the 14 gauge White wire from STLDBEACON wiring
to TB1-3.
2.5.2.4 Connect the 16 gauge Brownwire fromSTLDBEACONwiring to
TB1-4.6

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
2.5.2.5 Connect the 16 gauge Blue wire from STLDBEACON wiring to
TB1-5.
2.5.2.6 Connect the 10 gauge Red wire from STLDBEACON wiring to
Fuse Block marked “B.”
2.5.2.7 Connect the 14 gauge White/Green wire from STLDBEACON
wiring to TB1-11.
2.5.2.8 Connect the 14 gauge Green wire from STLDBEACON ground
back panel.
2.5.2.9 Connect the Neutral wire from sidelight wiring to TB1-12.
2.5.2.10 Connect the Red wire from the sidelight wiring to Fuse Block
marked “S.”
2.5.2.11 Connect the ground wire (if cable is used) from sidelight wiring to
ground screw left of TB1.
2.6 ALARM WIRING
Individual alarm contacts (Form C) are provided for strobe failures, power failure,
and photocell on. It is left up to the customer or installer on how they choose to
utilize these contacts with their monitoring equipment. External monitoring
equipment is available. Please inquire within the sales staff at the factory for models
available and pricing. Alarm configurations are shown on drawings H40-264, and
M01-264.
7

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
2.6.1 White Strobe Failure (SF)
Connect the customer's alarm common to plug P12, terminal #5. Connect the
customer's alarm wire to plug P12, terminal #6, for normally open (or)
terminal #4, for normally closed monitoring.
2.6.2 Lights On (LO) – Nighttime
Connect the customer's alarm common to plug P12, terminal #2. Connect the
customer's alarm wire to plug P12, terminal #1, for normally open (or)
terminal #3, for normally closed monitoring.
2.6.3 Power Failure (PF)
Connect the customer's alarm common to plug P12, terminal #11. Connect
the customer's alarm wire to plug P12, terminal #12, for normally open (or)
terminal #10, for normally closed monitoring.
2.6.4 LED Red Beacon Burnout (BB)
Connect the customer's alarm common to plug P12, terminal #8. Connect the
customer's alarm wire to plug P12, terminal #7, for normally open (or)
terminal #9, for normally closed monitoring.
2.6.5 Sidelight Failure (SL)
Connect the customer's alarm common to plug P12, terminal #14. Connect
the customer's alarm wire to plug P12, terminal #15, for normally open (or)
terminal #13, for normally closed monitoring.
8

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
2.7 ALARM TESTING
To test alarms, follow these procedures using an "ohm" meter between alarm
common and alarm points.
2.7.1 White Strobe Failure (SF)
White strobe failure testing can be performed in the daymode operation.
Check for status of strobe beacon. Turn "on" switch “S1” on PCB 1, and
status should change after an eight (8) second delay. After test, turn switch
“S1” to the normal operating position.
2.7.2 Lights On (LO)
When controller turns red light mode “ON,” lights on relay energize,
indicating red system functional.
2.7.3 Power Failure (PF)
While the controller is in normal operation, shut off power to the controller at
the breaker panel. Alarm should be prompt. Reset the breaker to resume
normal operation.
2.7.4 LED Red Beacon Burnout (BB)
Controller should be in the nightmode of operation when performingthistest.
Pull Fuse Block marked “F5” to cause failure. System will then operate in
fail mode white strobe. After test, re-engage fuse switch “F5.”
2.7.5 Sidelight Failure (SL)
Controller should be in the nightmode of operation. Check status of
operation. Pull fuse switch “F4” open. Alarm should occur within five (5)
seconds. After test, re-engage fuse switch “F4.” 9

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
3.0 THEORY OF OPERATION
3.1 THE POWER SUPPLY
The AC line is sent to transformers T1 through fuse F1, MOVMOD, and relay K1.
In order for K1 to energize and complete the circuit to T1, the safety interlock
switches (CSS & BSS) must be closed. The BSS (beacon safety switch) is located in
the base of the beacon. In order for the system to operate, the beacons and the power
supply must be closed and secured. The CSS (cabinet safety switch) is located in the
enclosure door of the control cabinet. This switch is a three (3) position switch that
can be pulled out or depressed by closing the door to complete the circuit.
Transformer T1 secondary outputs are around 1,100V AC. These outputs are sent to
the high voltage rectifier PCB (PCB #2) and converts the 1,100V AC to around
+550V DC and -550V DC in daymode operation. This high voltage is then used to
charge energy storage capacitor bank C103-C109. Resistor R31 is bypassed through
K5 during daymode operation.
When the light level drops below 3 foot candles, the photocell supplies 120V AC to
relay K3, and energizes it. The power is switched from the T1 to the red beacon
control circuit. That consists of a flasher (M1) and a timing module (M4), which will
flash the beacon, and a current sensing module (M2), which detects failures.
In the event of LED beacon failure or flasher failure, the K9 relay (failsafe relay) will
remove power from the K3 relay, de-energizing it. The power is then switched back
to the strobe control circuit (T1). The photocell continues to supply 120V AC to the
controller. This voltage is supplied to the K5 relay, which removes C103-C109 from
the discharge path leaving capacitor C102 in the circuit for failsafe mode operation.
Transformer T1 secondary outputs are converted from 1,100V AC at the PCB #2 to
around +700V DC and -550V DC for failsafe mode operation. This high voltage is
then used to charge the energy storage capacitor C102 through the current limiting
resistor R31, and the steering diode D5. The energy storage capacitor bank is
connected to the flashtube through the interconnecting tower wiring.
10

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
3.2 THE FLASHTUBE
The flashtubes FT1 (daymode) is a quartz tube containing two (2) electrodes. The
electrode at the positive (+) end is called the anode and is connected to the positive
side of the storage capacitors through inductor L1. The electrode at the negative (-)
end of the tube is called the Cathode, and is connected to the negative (-) side of the
energy storage capacitors banks.
The flashtube contains a gas called Xenon. When the high voltage energy in the
storage capacitors is connected to the flashtube, nothing will happen since Xenon in
its natural state is not a conductor of electricity. However, when a very short
duration high voltage pulse is impressed on the trigger element of the tube (via the
power supply and trigger transformer T4), the Xenon gas is ionized and thereby
becomes a good conductor of electricity. This allows the electrical energy in the
storage capacitors to discharge rapidly through the flashtube, which converts this
energy to light energy and heat energy. When the voltage stored in the capacitors
discharges to a low level, the Xenon gas can no longer sustain conduction and since
the short trigger pulse is gone by this time, it deionizes returning to its non-
conducting state until another trigger pulse arrives to repeat the process. Meanwhile,
the storage capacitor is being recharged by the transformer and the high voltage
rectifiers.
3.3 LED BEACON
When the photocell turns on at nightfall, that sends 120V AC to Relay K3, and
energizes it. The power is switched to red beacon control circuit. That consists of a
flasher (M1), a timing module (M4), and a current sensing module (M2). These
modules are used to flash the LED Beacon and detect the failures, as well.
3.4 TIMING CIRCUIT
The timing circuit is contained entirely on printed circuit board #1. The timing
circuit has its own power supply. This circuit converts the AC voltage to
approximately 12V DC, which is used to supply all of the components in this circuit.
It uses this low voltage DC to generate pulses that control the flash rate of the
flashtube. It actually generates two (2) groups of pulses. The first is a pulse
approximately once every 1.5 seconds to operate the flashtube during daylight hours.
The second is a burst at 100 Hz to elongate the apparent flash during the nighttime
hours at reduced flash energy when it failsafes in nightmode.

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
11
3.5 TRIGGER CIRCUIT
The trigger circuit is supplied by transformer T2 secondary windings. The 250V AC
is converted to DC, which is stored in a storage capacitor much like the action of the
high voltage circuit. The main difference is that the storage capacitor is much
smaller. The trigger circuit receives the pulses generated by the timing circuit. It
releases its stored energy with each pulse and delivers it to the flashtube's trigger
element to initiate each flash.
3.6 ALARM CIRCUITS
3.6.1 White Strobe Failure (SF)
White Strobe Failure alarm circuit monitors each flash of the daymode
flashtube within the beacon. If the flashtube fails to flash (for any reason),
the alarm circuit operates relay K11, (on PCB #3) which the customer can
connect to their alarm transmitting devices. The alarm point can be accessed
on P12 of PCB #3.
3.6.2 LED Red Beacon Burnout (BB)
When LED Red Beacon burns out, or failsto flash, a signal from Module M2
will energize the K8 relay on PCB #3, then K8 will energize K10, for LED
Red Beacon Alarm. Alarm point can be accessed on P12, PCB #3.
3.6.3 Power Failure (PF)
The power failure alarm relay is energized during normal operation. If the
power is removed for any reason, then relay K6 will drop, creating an alarm
for the customer’s alarm-transmitting device.
3.6.4 Sidelight Failure (SL)
Module M3 monitors the current flowing to the sidelights. This module can
monitor from 1-4 lamps. Factory setting is generally for three (3) lamps.
When the current falls below two (2) lamps (one [1] lamp less than the
factory setting), then the onboard relay will engage, creating an alarm which
is then sent to P12.

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
12
3.7 BLEEDER CIRCUIT
The bleeder circuit is the most important safety item in this system. It consists of
resistor R32 connected to the high voltage storage capacitor through relay K2. When
the AC line voltage is turned off, the relay will close allowing the resistors to
discharge the high voltage stored in the capacitor banks below 50V in 30 seconds.
**CAUTION**
NEVER RELY ON THIS CIRCUIT TO RENDER THIS SYSTEM
HARMLESS. ANY DEFECT IN THIS CIRCUIT COULD ALLOW A
HAZARDOUS HIGH VOLTAGE CHARGE TO REMAIN ON THE
STORAGE CAPACITORS. ALWAYS WAIT AT LEAST 30 SECONDS
AFTER POWER HAS BEEN TURNED OFF BEFORE STARTING ANY
WORK ON THISSYSTEM. ALWAYSMEASURE THEVOLTAGEONTHE
STORAGE CAPACITORS WITH A VOLTMETER BEFORE STARTING
ANY OTHER WORK ON THIS SYSTEM. NEVER ATTEMPTTO DEFEAT
THE SAFETY INTERLOCKS.
3.8 DIAGNOSTIC CIRCUITS
The diagnostic circuit is provided as a means of making system checks and
maintenance more convenient. This circuit is entirely contained on the printed
circuit boards PCB #1 and PCB #2. The circuits that are contained on PCB #1 and
PCB #2 are as follows:
3.8.1 Control Power On (PCB #1, LED4)
Line from the 120V AC input is sent through safety switches CSS, BSS,
isolation transformer T2, fuse F3, and Relay K1 to PCB #1. Once this low
voltage is at PCB #1, it is sent to a step down transformer, then it is rectified,
then sent to LED4 (D15). If for any reason power is interrupted,
STLDBEACON opened, controller door open, blown F3 fuse, failed relay,
etc.) LED4 would be extinguished.

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
13
3.8.2 High Voltage (PCB #2, LED 1, #D14)
The Cathode side of the high voltage HV is routed through a current limiting
resistor. When the unit is in daymode, LED 1, D14 will be at full brightness
when the capacitors are at full charge, but dims with the discharging of the
storage capacitors. A constant intensity indicates that high voltage is present
but capacitors are not discharging (check other indicators for fault). When
the red LED fails to glow, then the high voltage is no longer present.
3.8.3 Trigger Voltage (PCB #1, LED6)
The voltage from secondary of T1 is sent to PCB #1, then rectified for trigger
circuit. The LED6 is connected to the trigger voltage via R30. Under normal
circumstances, the red LED must be flashing synchronously with the strobe.
An absence of this indication means that the voltage is no longer present.
3.8.4 Nightmode
Output voltage from the photocell (SSR) energizes K4 on PCB #3. The
circuit switches the input power to the red circuit that in turn will operate the
LED Red Beacon. If a failure in the LED Red Beacon occurs, the control
circuit will switch power back to the white strobe for failsafe as described in
the next section.
3.8.4.1 Failsafe Mode (PCB #1, LED7)
Since the power switches back to the strobe circuit, the photocell
(SSR) energizes RYL1 on the main PCB #1 that will send 12V to
Light LED7, and set timing circuit operating in nightmode as well.
3.8.5 Primary Timing (PCB #1, LED8)
The primary timing pulses are received at LED8 (D3). LED8 will flash
according to the pulses received from the timing circuit. If LED8 fails to
flash, then the primary timing circuit has failed. Check LED9 (D28) for
secondary timing operation. The strobe unit should produce 40 (+/-2) pulses
per minute. 14

DUAL MEDIUM INTENSITY LED/STROBE
MODEL E-1DBSL
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
3.8.6 Timing Signal Verify (PCB #1, LED9)
Timing pulses (either primary or secondary) are received at LED9 (D28).
The LED will flash according to the pulses received from the timing circuit,
but should be 40 +/-2 FPM. In the unlikely event that this LED is out, then
total timing failure has occurred.
3.8.7 Flash Verified (PCB #1, LED5)
Current from the Cathode side of the flashtube (FTC) is sent through the
current sensing transformer T4 on PCB #1. T4 will send a pulse to the gate
of the SCR's Q13, and turn it on. Capacitor C15, which is fully charged via
Q13, will send voltage to LED5. After each confirmed flash, LED5 will
blink. Absence of a blinking LED signifies that the strobe beacon has ceased
to flash.
3.8.8 Strobe Fail Test (PBC #1, LED2)
Switch S1, when turned downward, cuts off the timing signal to the trigger
circuit and extinguishes LED9 (D28). Then LED2 (D25) flashes to confirm
the trigger circuit is disabled. At this time, a strobe alarm should be received
at P12. The normal position of switch S1 is on (switch upward).
15