TWR Lighting D-1LVS User manual

4300 WINDFERN RD. #100 HOUSTON TX 77041-8943
VOICE [phone] FAX [phone]
WEB: twrlighting.com
D1LVS-T GPS CONTROLLER
ADDENDUM
NOTE
PLEASE READ
***IMPORTANT NOTICE***
This controller has been modified from a D1LVS to a
D1LVS-T GPS. The changes are as follows:
One (1)40 uF capacitor has been removed from this
controller and PCB#1 has been changed from a
STH01283 to a STH01285HK GPS.
Please adhere to these changes when servicing this unit.
FOR ADDITIONAL INFORMATION OR HELP, PLEASE CONTACT OUR
TECHNICAL SUPPORT GROUP AT [phone] EXT 132, 136, OR 151.

C:\Documents and Settings\esalazar\Local Settings\Temporary Internet Files\OLK1\D-1LVS Rev 040903.doc
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev. 03/20/03 (TWR logo Dwgs) Rev 04/09/03
4300 WINDFERN RD. #100 HOUSTON TX 77041-8943
VOICE [phone] FAX [phone]
WEB: www.twrlighting.com
IMPORTANT!!!
PLEASETAKETHE TIMETOFILLOUT THEFORMCOMPLETELY. FILE IN
ASAFEPLACE. INTHEEVENTYOU EXPERIENCE PROBLEMSWITHOR
HAVE QUESTIONS CONCERNING YOUR CONTROLLER, THE
FOLLOWING INFORMATION IS NECESSARY TO OBTAIN PROPER
SERVICE AND PARTS.
MODEL # D-1LVS
SERIAL #
PURCHASE DATE
PURCHASED FROM

D-1LVS CONTROLLER
C:\Documents and Settings\esalazar\Local Settings\Temporary Internet Files\OLK1\D-1LVS Rev 040903.doc
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo Dwgs) Rev 04/09/03
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 ..........................................................................................2
2.4 POWER WIRING...................................................................................................3
2.5 TOWER LIGHTING KIT.........................................................................................3
2.5.1 Beacon Mounting.......................................................................................3
2.5.2 Lighting Kit Wiring......................................................................................4
2.6 ALARM WIRING................................................................................................................4
2.6.1 Alarm testing .........................................................................................................4
2.6.2 Strobe Failure (SF)................................................................................................4
2.6.3 Power Failure (PF) ................................................................................................4
2.6.4 Photocell (PC) .......................................................................................................5
2.7 CONTROLLER CONFIGURATION...................................................................................5
3.0 THEORY OF OPERATION...............................................................................................6
3.1 THE POWER SUPPLY..........................................................................................6
3.2 THE FLASHTUBE.................................................................................................6
3.3 TIMING CIRCUIT ..................................................................................................7
3.4 TRIGGER CIRCUIT...............................................................................................7
3.5 ALARM CIRCUITS................................................................................................7
3.5.1 Strobe Failure (SF)....................................................................................7
3.5.2 Photocell (PC)............................................................................................7
3.6 BLEEDER CIRCUIT..............................................................................................8
3.7 STROBE DIAGNOSTIC CIRCUITS ......................................................................8
3.7.1 Control Power On......................................................................................8
3.7.2 High Voltage..............................................................................................8
3.7.3 Trigger Voltage..........................................................................................9
3.7.4 Nightmode .................................................................................................9
3.7.5 Primary Timing...........................................................................................9
3.7.6 Timing Signal Verify...................................................................................9
3.7.7 Flash Verified.............................................................................................9
3.7.8 Strobe Fail Test .........................................................................................9

D-1LVS CONTROLLER
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12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo Dwgs) Rev 04/09/03
4.0 TROUBLE SHOOTING...................................................................................................10
4.1 TOOL REQUIREMENTS.....................................................................................10
4.2 DIAGNOSTIC EVALUATION ..............................................................................10
4.3 TROUBLE SHOOTING ASSISTANCE................................................................11
4.3.1 Flash Verify LED - Out.............................................................................11
4.3.2 Control Power On LED - Out...................................................................11
4.3.3 Primary Timing LED Out..........................................................................11
4.3.4 False or Nonexistent Beacon Alarms ......................................................12
5.0 MAINTENANCE GUIDE..................................................................................................13
5.1 FLASHTUBE REPLACEMENT ...........................................................................13
5.2 POWER SUPPLY................................................................................................13
5.3 PHOTOCELL.......................................................................................................13
6.0 MAJOR COMPONENTS PARTS LIST ...........................................................................14
7.0 RECOMMENDED SPARE PARTS LIST.........................................................................16
PRODUCT WARRANTY.............................................................................................................17
RETURN POLICY .................................................................................................................18
RETURN MERCHANDISE AUTHORIZATION FORM (RMA) ....................................................19

D-1LVS CONTROLLER
C:\Documents and Settings\esalazar\Local Settings\Temporary Internet Files\OLK1\D-1LVS Rev 040903.doc
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo Dwgs) Rev 04/09/03
APPENDIX
Chassis Layout.....................................................................................................H40-283
Wiring Diagram ...................................................................................................M01-283
Housing Details D-1LVS......................................................................................HD0-283
Installation Guideline............................................................................................INS-283
Photocell Housing Detail....................................................................................... 100239
Tower Lighting Kit - Cable......................................................................................500-12
Control PCB #1 .................................................................................................H01-226B
High Voltage Rectifier PCB #2 .........................................................................H02-226A
Relay PCB #3.......................................................................................................H03-226
Strobe Beacon Detail ........................................................................................... 100437i

D-1LVS CONTROLLER
C:\Documents and Settings\esalazar\Local Settings\Temporary Internet Files\OLK1\D-1LVS Rev 040903.doc
3/8/2006
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo – Dwgs) Rev 04/09/03 - 1 -
1.0 INTRODUCTION
TWR Lighting Division’s Model D-1LVS Type L-865 Controller has been designed and built
to the Federal Aviation Administration’s (FAA) 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 APPLICATION
The D-1LVS L-865 Controller is for use on lighting structures or towers that are
approved to be lighted with Medium Intensity Strobes in accordance with the FAA’s
Advisory Circular 70/7460-1K. Structures from 201' to 350' may be lighted with
Medium Intensity lights. NOTE: Structures exceeding 500' will require to be
painted in addition to this lighting for added visual hazard marking.
1.2 SPECIFICATIONS OF EQUIPMENT
Dimensions:
Controller (HxWxD)/Weight 18.0"x16.0"x9.25" 45.0 lbs.
Mounting Dim (HxW) 18.74"x12"
Beacon Height/Weight 17.25" 21 lbs.
Cable Diameter/Weight Per 100 ft. .625" +/- 10% 24 lbs.
Electrical 120V AC +/- 10% 60 Hz (Standard)
240V AC +/- 10% 60 Hz (Available)
Intensity:
Daymode 20,000 +/- 25% Effective Candelas
Nightmode 2,000 +/- 25% Effective Candelas
Beamspread:
Horizontal 360°
Vertical 3°minimum
Flash Rate:
Daymode 40 fpm +/- 2 fpm
Nightmode 40 fpm +/- 2 fpm
Wattage:
Daymode 95 Watts
Nightmode 35 Watts
Temperature: +55°C / -55°C

D-1LVS CONTROLLER
C:\Documents and Settings\esalazar\Local Settings\Temporary Internet Files\OLK1\D-1LVS Rev 040903.doc
3/8/2006
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo – Dwgs) Rev 04/09/03 - 2 -
2.0 INSTALLATION
2.1 POWER SUPPLY CONTROL CABINET MOUNTING
The power supply control cabinet can be locatedat thebase of thestructure orin 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 drawing
HDO-283 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.
2.3 PHOTOCELL WIRING
(Refer to Drawings HD0-283 and H40-283)
If the control cabinet is mounted inside an equipment building, the photocellshould
be mounted vertically on ½” conduit outside the building above the eaves facing
north. Wiringfromthe photocellhousing socketto thecontrolcabinetshould consist
of one each; red, black, and white wires. The white wire is connected to the socket
terminal marked “COM”, the black wire is connected to the socket terminal marked
“B”, and the red wire is connected to the socket terminal marked “R”. These socket
connectionsaremade by using .25" quick connect terminals,which mustbecrimped
to the wires. 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 ismounted outside anequipment building, the photocellshould
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 TB1-8.
2.3.2 Connect the RED wire from the photocell to TB1-6.
2.3.3 Connect the WHITE wire from the photocell to TB1-7.

D-1LVS CONTROLLER
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3/8/2006
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo – Dwgs) Rev 04/09/03 - 3 -
2.3.4 Install thephotocellinto the receptacle and twist to theright while depressing
to lock into place.
Note: When installing multiple controllers together, the photocell is only
required on one (1) unit. It can be installed on the master (or) slave. SSR
interconnect wire must be common to all units. D2/3LV SSR TB3-2 / D-1LVS
SSR TB1-6.
2.4 POWER WIRING
(Refer to Drawing H40-283)
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.
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 tower and/or building grounding
system with the exception of installations on AM/RF Applications where
controllergroundingto earth ground is prohibited. Ground the controlleronly
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 to wire the
strobe beacon. Refer to Lighting Kit Drawing 500-12 for cable installation.
2.5.1 Beacon Mounting
(Refer to Drawing HDO-283)
2.5.1.1 Bolt the beacon to the mounting plate using four 5/8" x 1 1/2"
galvanized bolts that are supplied. Installer should make sure to
check for full thread engagement on Anco locknut. Allow 18"
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 beacon using the 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.

D-1LVS CONTROLLER
C:\Documents and Settings\esalazar\Local Settings\Temporary Internet Files\OLK1\D-1LVS Rev 040903.doc
3/8/2006
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo – Dwgs) Rev 04/09/03 - 4 -

D-1LVS CONTROLLER
C:\Documents and Settings\esalazar\Local Settings\Temporary Internet Files\OLK1\D-1LVS Rev 040903.doc
3/8/2006
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo – Dwgs) Rev 04/09/03 - 5 -
2.5.2 Lighting Kit Wiring
Install wiring between the controller to the beacon utilizing strobe cable
method. (TWR LIGHTING CANNOT WARRANTY SYSTEMS THAT
EMPLOY SPLICING CABLE.) Refer to drawings HDO-283 and 500-12
for install of lighting kits. Follow these minimum guidelines as well as any
local or end user addition requirements. Installing lighting 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
specifically requested by a customer and installed in this manual. In cases
such as this, the drawings will precede the manual if a conflict occurs.
2.6 ALARM WIRING
Individual alarm contacts (Form C) are provided for strobe failure, 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. Alarmconfigurationsare shownon
drawing H40-283.
2.6.1 Alarm testing
To test alarms, follow these procedures using an “ohm” meter between
alarm common and alarm points.
2.6.2 Strobe Failure (SF)
Strobe failure testing can be performed in either day or nightmode strobe
operation. Check for status of strobe beacon. Turn on switchS1 on PCB #1
and status should change after an eight (8) second delay. After test, switch
S1 to normal operating position.
2.6.3 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 breaker to resume
normal operation.
2.6.4 Photocell (PC)
Controller should be in the daymode of operation when performing this test.
Check status of operation. Turn SW3 on or cover the photocell and alarm

D-1LVS CONTROLLER
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3/8/2006
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo – Dwgs) Rev 04/09/03 - 6 -
status should change state. After test turn SW3 to normal operating
position.
2.7 CONTROLLER CONFIGURATION
(Refer to Drawing H01-226B)
This unit is factory set-up to be a master controller. If this unit is to be used in
conjunction with an additional unit, change dipswitch settings (DS1) as drawing
indicates.
2.7.1 Connect at least an18/20 gauge wire from master unit D2/3LV PCB 1-15
(TS) to slave unit D2/3LV PCB1 P1-15 (TS) or D-1LVS PCB1 P1-15 (TS).
2.7.2 Connect at least an 18/20 gauge wire (ground)from one chassis to the other
chassis.
2.7.3 Use a single breaker for supply power to all controllers.
2.7.4 Follow standard instructions provided in the manuals supplied with the
controllers.

D-1LVS CONTROLLER
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3/8/2006
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo – Dwgs) Rev 04/09/03 - 7 -
3.0 THEORY OF OPERATION
3.1 THE POWER SUPPLY
The AC line is sent to transformer T1 through fuse F1 and relay K1. In order for K1
to energize and complete the circuit to T1, the safety interlock switch CSS, BSS,
must be closed. The BSS switch is located in the base of the beacon. In order for
the system to operate, the beacon and the power supply must be closed and
secured.
Transformer T1 secondary output is around 1,000V AC. These outputs are sent to
the high voltage rectifier PCB (PCB #3) and converts the 1,000V AC of the
transformer to around +500V DC and -500V DC in daymode and +700V DC and -
550V DC in nightmode. This high voltage is then used tochargethe energy storage
capacitorC102through current limiting resistor R31 steering diodeD5fornightmode
operation. Resistor R31 is by-passed through relay K5 for daymode operation.
Energy storage capacitors bank C103-109 is used for the daymode operation and
are connected to the high voltage through the normally closed contacts of relay K5.
When the light level drops below 3-foot candles, the photocell supplies 120V AC to
relay K5, which removes C103-109 from the discharge path leaving capacitor C102
in the circuit for nightmode operation.
The energy storage capacitor bank is connected to the flashtube through the
interconnecting tower wiring.
3.2 THE FLASHTUBE
The flashtube FT is a quartz tube containing two(2) electrodeseach. Theelectrode
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 theflashtube, 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 andsince
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,thestorage capacitor is being recharged by thetransformerand the high
voltage rectifier.

D-1LVS CONTROLLER
C:\Documents and Settings\esalazar\Local Settings\Temporary Internet Files\OLK1\D-1LVS Rev 040903.doc
3/8/2006
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo – Dwgs) Rev 04/09/03 - 8 -

D-1LVS CONTROLLER
C:\Documents and Settings\esalazar\Local Settings\Temporary Internet Files\OLK1\D-1LVS Rev 040903.doc
3/8/2006
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo – Dwgs) Rev 04/09/03 - 9 -
3.3 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 linevoltagetoapproximately
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
1.4 seconds to operate the flashtube during the daylight hours. The second is a
burst of 10 or more very rapid pulses (to elongate the apparent flash) every flash to
operate the flashtube during the nighttime hours at reduced flash energy.
3.4 TRIGGER CIRCUIT
The trigger circuit is supplied by one (1) of transformer T1's secondary windings.
The 300V 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.
3.5 ALARM CIRCUITS
3.5.1 Strobe Failure (SF)
Strobe Failure alarm circuit monitors each flash of the flashtube within each
beacon. If the flashtube fails to flash (for any reason), the alarm circuit
operates a relay (on PCB #1) that the customer can connect to their alarm
transmitting devices. The alarm point can be accessed on J2 on PCB #1.
The power failure alarm relay is energized during normal operation. Should
the power be removed for any reason, then relay K6 would drop,creating an
alarm for the customer alarm transmitting device.
3.5.2 Photocell (PC)
The photocell alarm relay is energized wheneverthephotocellor SW3 is on.
This relay will allow the customer to monitor the modes of operation to
determine if switch from day to nightmode has occurred.
3.6 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, relays close allowing the resistors to
discharge the high voltage stored in the capacitor bank below 50V in 30 seconds.

D-1LVS CONTROLLER
C:\Documents and Settings\esalazar\Local Settings\Temporary Internet Files\OLK1\D-1LVS Rev 040903.doc
3/8/2006
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo – Dwgs) Rev 04/09/03 - 10 -
***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 THIS SYSTEM. ALWAYS MEASURE THE
VOLTAGE ON THE STORAGE CAPACITORS WITH A VOLTMETER BEFORE
STARTING ANY OTHER WORK ON THIS SYSTEM. NEVER ATTEMPT TO
DEFEAT THE SAFETY INTERLOCKS.
3.7 STROBE 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:
3.7.1 Control Power On
Line from the 120V AC input is sent through safety switches CSS and BSS
isolation transformer T2, fuseF3, and relayK1 to PCB#1. Once this voltage
is at PCB #1, it is sent to a step down transformer and is rectified then sent
to LED4 (D15). If for any reason power is interrupted, (beacon opened,
controller door open, blown F3 fuse, failed relay, etc.) LED4 would be
extinguished.
3.7.2 High Voltage
The Cathode side of the high voltage HV is routed through current limiting
resistor. When the unit is in daymode, D14 will be at full brightness when
the capacitors are at full charge, but dimswith 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 high voltage is no longer present.
3.7.3 Trigger Voltage
The trigger voltage from fuse F2 (CT1A) is sent to current limiting resistor
R30 and LED6 (D20). Under normal circumstances, the redLED should be
at full intensity indicating voltage to be normal. An absence ofthis indication
means that the voltage is no longer present.

D-1LVS CONTROLLER
C:\Documents and Settings\esalazar\Local Settings\Temporary Internet Files\OLK1\D-1LVS Rev 040903.doc
3/8/2006
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo – Dwgs) Rev 04/09/03 - 11 -
3.7.4 Nightmode
Output voltage from the photocell (SSR) is connected to the coil of relay
RLY1. Whenever the photocell senses darkness or switch SW3 is on, relay
RLY1 will energize thereby sending 12V to the timing circuit as well as to
LED7, letting LED7 (D7) glow a constant red.
3.7.5 Primary Timing
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 for secondary
timing operation. The strobe unit should produce 40 (+/-2) pulses per
minute.
3.7.6 Timing Signal Verify
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.
3.7.7 Flash Verified
Current from the Cathode side of the flashtube (FTC) is sent through the
current sensing transformer T1 on PCB #1. T1 will send a pulse to the gate
of the SCR’s Q2 and turns it on. Capacitor C11 via Q2 will send voltage to
LED5 (D8). After each confirmed flash, LED 5 will blink. Absence of a
blinking LED signifies that strobe beacon has ceased to flash.
3.7.8 Strobe Fail Test
Switch S1, when turned on, cuts off the timingsignal to the trigger circuit and
illuminates LED2 (D25). At this time a strobe alarm should be received at
J2. The normal position of S1 is off (switch upward).

D-1LVS CONTROLLER
C:\Documents and Settings\esalazar\Local Settings\Temporary Internet Files\OLK1\D-1LVS Rev 040903.doc
3/8/2006
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo – Dwgs) Rev 04/09/03 - 12 -
4.0 TROUBLE SHOOTING
Much of the trouble shooting of this system will consist of correcting a “beacon out”
situation. There may also be a failure mode where the flashtube is still flashing, but at the
wrong rate or the wrong intensity.
You must study and understand the safety messages and the theory of operation before
attempting any service on this system. Servicing this system must be done by qualified
personnel only.
***W A R N I N G - H I G H - V O L T A G E***
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. READ AND UNDERSTAND THE
THEORY OF OPERATION AND ITS SAFETY MESSAGES BEFORE ATTEMPTING
INSTALLATION OF THIS SYSTEM. DO NOT ATTEMPT TO DEFEAT THE INTERNAL
SAFETY DEVICES.
4.1 TOOL REQUIREMENTS
In order to be prepared to troubleshoot or repair this system, a minimum amount of
tools and equipment will be required. A recommendation list includes:
1) 5/16 Electrician’s Screwdriver
1) Nut Drivers or Socket Set
1) Multi meter - Analog or Digital 600V AC/600V DC Minimum
4.2 DIAGNOSTIC EVALUATION
The first step in troubleshooting of this system or performing annual maintenance
will require the technician to open the controller door. With the power off to the
controller, the technician should look over the controller circuit and repair or replace
any apparent problems such as loose wire connections or corroded terminations.
After the initial visual checks have been completed, restore power to the controller
and pull out on the plunger of the cabinet safety switch (CSS) located at the lower
right edge of the enclosure. Observe at this time the LEDs located on PCB #1 and
PCB #2. Determine by observation of these LED indicators if the controller is
performing to normal operation.

D-1LVS CONTROLLER
C:\Documents and Settings\esalazar\Local Settings\Temporary Internet Files\OLK1\D-1LVS Rev 040903.doc
3/8/2006
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo – Dwgs) Rev 04/09/03 - 13 -
LEDs on PCB #1 are numbered from top to bottom 1-9. LEDs on PCB #2 are
numbered from top to bottom D14 - D16. The following chart will indicate normal
LED operation.
INDICATOR OPERATION NORMAL STATUS
LED 1 Flash Verify 2 N/A
LED 2 Strobe Fail Test Normal OFF/Flashes in Test Mode
LED 3 Flash Verify 1 Blinks
LED 4 Control Power ON Steady ON
LED 5 Flash Verify 3 N/A
LED 6 Trigger Voltage Steady ON
LED 7 Nightmode Steady ON During Nightmode Operation
LED 8 Primary Timing Flashing
LED 9 Timing Verify Flashing
D11 High Voltage #1 Steady ON when Voltage Above 50V DC
D12 High Voltage #2 N/A
D13 High Voltage #3 N/A
4.3 TROUBLE SHOOTING ASSISTANCE
4.3.1 Flash Verify LED - Out
4.3.1.1 Observe high voltage LED on the same beacon circuit to
determine if it is available. If the LED is dim or out completely,
then check high voltage capacitor bank for a short. If no
capacitor is found to be shorted, check the resonant cap for a
short. If the resonant cap is okay, replace PCB #2. If the LEDis
at full illumination, go to the next step.
4.3.1.2 Check the status of the trigger LED. If LED is dim or off, check
fuse F2. If blown, replace with exact type of fuse. If the fuse
blows again, replace PCB #1. If LED is okay, go to the next
step.
4.3.1.3 If steps 4.3.1.1 and 4.3.1.2 check out okay, relamp the beacon.
4.3.2 Control Power On LED - Out
Check interlock circuit for an open circuit. If open, make the necessary
repairs. If okay, check fuse F3. Replace if bad.
4.3.3 Primary Timing LED Out
Observe the status of the timing LED. If the LED is dim or out completely,
check LED9, if dim or out, replace PCB #1. If one or both are lit, youshould
have timing.

D-1LVS CONTROLLER
C:\Documents and Settings\esalazar\Local Settings\Temporary Internet Files\OLK1\D-1LVS Rev 040903.doc
3/8/2006
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo – Dwgs) Rev 04/09/03 - 14 -
4.3.4 False or Nonexistent Beacon Alarms
4.3.4.1 If alarms trip when the system appears to be working normallyor
fails to show an alarm when there is an obvious failure, replace
PCB #1.
4.3.4.2 The time delay between an actual failure and the pointwhere the
relay trips is preset at the factory at about eight (8) seconds.
This delay period can be tested by throwing “on” switch S1 (on
the circuit board #1). When this switch is in the alarm test mode,
the test mode indicator (LED2) will be illuminated or blinking
slightly.

D-1LVS CONTROLLER
C:\Documents and Settings\esalazar\Local Settings\Temporary Internet Files\OLK1\D-1LVS Rev 040903.doc
3/8/2006
12/98; Rev. 6/99; Rev. 03/00; Rev. 05/00;
Rev. 07/07/00 (dwg H01-226B); Reg. 07/08/00 (Pg. 9, DSI);
Rev. 07/00 (o2L/H); Rev. 10/18/00 (retyped & o2-dwgs.)
Rev. 05/14/01 (revised pg 1 – mounting width; warranty & return policy)
Rev 03/20/03 (TWR logo – Dwgs) Rev 04/09/03 - 15 -
***W A R N I N G - H I G H - V O L T A G E***
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. READ AND UNDERSTAND THE THEORY OF
OPERATION AND ITS SAFETY MESSAGES BEFORE ATTEMPTING INSTALLATION OFTHIS
SYSTEM. DO NOT ATTEMPT TO DEFEAT THE INTERNAL SAFETY DEVICES.
5.0 MAINTENANCE GUIDE
5.1 FLASHTUBE REPLACEMENT
The only required maintenance needed to be performed is the replacement of the
flashtubeseverytwo (2) years. By following these instructions, maximumsafetyand
performance can be achieved.
5.1.1 Loosen the wing nut on each latch pin so that it can recline.
5.1.2 Open the lens and tilt it back.
ALWAYS WAIT AT LEAST 30 SECONDS AFTER OPENING THE BEACON
BEFORE STARTING ANY WORK ON THE BEACON.
5.1.3 Loosen the three (3) socket screws with a screwdriver to remove lamp.
5.1.4 Install the new flashtube making sure that the red marked pin is aligned with
the red wire on the socket. Make sure tube is flush on all socket lugs.
5.1.5 Tighten the socket screws snug, then 1/4 turn more.
5.1.6 Close the lens - make sure nothing hampers safety interlock action.
5.1.7 Re-tighten the three (3) wing nuts on the beacon.
5.2 POWER SUPPLY
No scheduled maintenance is required. Perform on an as needed basis only.
5.3 PHOTOCELL
The photocell is a sealed unit. No maintenance is needed or required other than