Will Burt Night Scan Chief Instruction manual

Night Scan Chief
NIGHT SCAN CHIEF
INSTALLATION, OPERATION & MAINTENANCE MANUAL
The Will-Burt Company
169 S. Main Street
Orrville, OH 44667
www.willburt.com
Revision 1, December 2007
Revision 1 i

Night Scan Chief
Revision 1 i
WARRANTY
The Manufacturer warrants its products to be free from defects in material and
workmanship for a period of one year from the date of shipment from the factory.
The Manufacturer shall not be responsible for any damage resulting to or caused by
its products by reason of improper installation, improper storage, unauthorized
service, alteration of products, neglect or abuse, or use of the product in a manner
inconsistent with its design, accident, acts of God, or failure to properly maintain this
product. This warranty does not extend to any component parts not manufactured by
Manufacturer, however, Manufacturer's warranty herein shall not limit any warranties
made by manufacturers of component parts which may extend to Buyer.
THE FOREGOING WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, AND
NO REPRESENTATIONS, GUARANTEES OR WARRANTIES, EXPRESS OR
IMPLIED, (INCLUDING, BUT NOT LIMITED, TO A WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE) ARE MADE
BY MANUFACTURER IN CONNECTION WITH THE MANUFACTURE OR SALE OF
ITS PRODUCTS. NO EMPLOYEE, DISTRIBUTOR, OR REPRESENTATIVE IS
AUTHORIZED TO CHANGE THIS WARRANTY IN ANY WAY OR GRANT ANY
OTHER WARRANTY ON BEHALF OF MANUFACTURER.
Claims for defects in material and workmanship shall be made in writing to
Manufacturer within thirty (30) days of the discovery of defect. Failure to provide
notice as required hereby shall be conclusive evidence that the product was in
conformity with the warranty, and the Manufacturer shall be released from any and all
liability relating to the product. Manufacturer may either send a service
representative or have the product returned to its factory at Buyer's expense for
inspection. If judged by Manufacturer to be defective in material or workmanship, the
product will be replaced or repaired at the option of Manufacturer, free from all
charges except authorized transportation.
THE REMEDIES OF BUYER SET FORTH HEREIN ARE EXCLUSIVE AND ARE IN
LIEU OF ALL OTHER REMEDIES. THE LIABILITY OF MANUFACTURER
WHETHER IN CONTRACT, TORT, UNDER ANY WARRANTY, OR OTHERWISE,
SHALL NOT EXTEND BEYOND ITS OBLIGATION TO REPAIR OR REPLACE, AT
ITS OPTION, ANY PRODUCT OR PART FOUND BY MANUFACTURER TO BE
DEFECTIVE IN MATERIAL OR WORKMANSHIP. MANUFACTURER SHALL NOT
BE LIABLE FOR COST OF INSTALLATION AND/OR REMOVAL, OR BE
RESPONSIBLE FOR DIRECT, INDIRECT, SPECIAL OR CONSEQUENTIAL
DAMAGES OF ANY NATURE.

Night Scan Chief
TABLE OF CONTENTS
0. SAFETY SUMMARY I
1. INTRODUCTION 1-1
1.1 Safety Precautions................................................................................................................................1-1
1.2 Introduction............................................................................................................................................1-1
1.3 Description.............................................................................................................................................1-1
1.4 Reference Data.....................................................................................................................................1-2
1.5 Technical Information............................................................................................................................1-2
2. INSTALLATION 2-1
2.1 Introduction............................................................................................................................................2-1
2.2 Tools and Materials Required for Installation........................................................................................2-1
2.3 Unpacking..............................................................................................................................................2-2
2.4 Attaching to vehicle ...............................................................................................................................2-2
2.5 Connecting the Push/Pull Switch (Junction Box)..................................................................................2-4
2.6 Connecting the Remote Control(s)........................................................................................................2-4
2.7 Connecting the Interlock Contact (optional)..........................................................................................2-5
2.8 Connecting Interlock Input Contacts (optional).....................................................................................2-5
2.9 Installing the Warning Light...................................................................................................................2-6
2.10 MULTIPLEX SYSTEMS OPERATING AT 24 VOLTS........................................................................2-6
2.11 Pre-operational Check.........................................................................................................................2-6
3. OPERATING INSTRUCTIONS 3-1
3.1 Theory of Operation – Mechanical........................................................................................................3-2
3.2 Theory of Operation – Electrical............................................................................................................3-3
3.3 Push/Pull Switch – NFPA INSTALLATIONS.........................................................................................3-3
3.4 Push/Pull Switch – non-NFPA INSTALLATIONS..................................................................................3-4
3.5 Remote Controls (Hand held)................................................................................................................3-4
3.6 Raising the Mast....................................................................................................................................3-5
3.7 Aiming the Remote Control Positioner..................................................................................................3-5
3.8 Stowing the Mast...................................................................................................................................3-5
3.9 Emergency Stow (Loss of Power):........................................................................................................3-6
4. MAINTENANCE AND SERVICE INSTRUCTIONS 4-1
4.1 Introduction............................................................................................................................................4-1
4.2 Scheduled Maintenance........................................................................................................................4-1
4.3 Adjustments...........................................................................................................................................4-2
4.4 System Schematics...............................................................................................................................4-7
4.5 Troubleshooting Electrical...................................................................................................................4-10
4.6 Troubleshooting Mechanical ...............................................................................................................4-19
5. PARTS LIST 5-1
5.1 Part Lists................................................................................................................................................5-1
6. REVISIONS 6-1
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Night Scan Chief
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7. SOFTWARE REVISIONS 7-1
7.1 Introduction.........................................................................................................................................7-1
8. APPENDICES 8-2
LIST OF ILLUSTRATIONS
Figure 1-1 Night Scan Chief Base and Remote Control Positioner..............................................................1-1
Figure 1-2 Mast Loads..................................................................................................................................1-1
Figure 2-1 Lifting Point..................................................................................................................................2-2
Figure 2-2 Night Scan Base Mounting Hole Locations.................................................................................2-3
Figure 2-3 Standard Junction Box ................................................................................................................2-3
Figure 2-4 Junction Mounting Hole Locations...............................................................................................2-4
Figure 2-5 Hand Held Receptacle Pins.........................................................................................................2-5
Figure 2-6 Example of Warning Light Installation.........................................................................................2-6
Figure 3-1 Actuator and Proximity Sensors..................................................................................................3-2
Figure 3-2 Photo Interrupter and Flag...........................................................................................................3-3
Figure 3-3 Cover and Screw Removal for Manual Stow (Night Scan Chief only) ........................................3-7
Figure 4-1 Proximity Switch Adjustment .......................................................................................................4-3
Figure 4-2 LED Location and Function.........................................................................................................4-3
Figure 4-3 Flag Settings................................................................................................................................4-5
Figure 4-4 DIP switch location: Chief base board.........................................................................................4-6
Figure 4-5 DIP switch location: Chief RCP board.........................................................................................4-6
Figure 4-6 NFPA Handheld Remote Wiring..................................................................................................4-7
Figure 4-7 Non-NFPA Hand Held Remote Wiring ........................................................................................4-7
Figure 4-8 Night Scan Chief Base Wiring.....................................................................................................4-8
Figure 4-9 Night Scan Chief Remote Control Positioner (RCP) Schematic.................................................4-9
Figure 5-1 Exploded View - Base Left Side..................................................................................................5-2
Figure 5-2 Base Right Side...........................................................................................................................5-3
Figure 5-3 Exploded View – Mast Pivot Assembly .......................................................................................5-3
Figure 5-4 Exploded View - Remote Control Positioner (RCP)....................................................................5-5
LIST OF TABLES
Table 1-1. Reference Data Night Scan Chief..................................................................................................1-2
Table 2-1. Tools and Materials Required for Installation ................................................................................2-1
Table 2-2. Handheld Remote Control Connector Pin-out...............................................................................2-5
Table 4-1. List of Base Board Faults.............................................................................................................4-10
Table 4-2. List of Remote Control Positioner Board Faults ..........................................................................4-14
Table 4-3. List of Remote Control Board Faults............................................................................................4-17
Table 4-4. List of Warning Codes .................................................................................................................4-18
Table 4-5. Mechanical Troubleshooting........................................................................................................4-19
Table 5-1. Night Scan Chief Base Assembly Parts List..................................................................................5-1
Table 5-2. Remote Control Positioner Assembly Parts List............................................................................5-4
Table 7-1. Software Revision Log...................................................................................................................7-1

Night Scan Chief
SAFETY SUMMARY
SIGNAL WORD DEFINITION
Per the ANSI Z535.4 standard, the following signal words and definitions are used to indicate hazardous
situations:
DANGER indicates an imminently hazardous situation that, if not avoided, will result in death or serious injury.
WARNING indicates a potentially hazardous situation that, if not avoided, could result in death or serious
injury.
CAUTION indicates a potentially hazardous situation that, if not avoided, may result in minor or moderate
injury. It is also used to alert against unsafe practices.
GENERAL SAFETY PRECAUTIONS
The following are general safety precautions that are not related to any specific procedures and therefore do
not appear elsewhere in this publication. These are recommended precautions that personnel must
understand and apply during many phases of operation and maintenance.
Electrocution Hazard! Contact with high voltage will result in death or serious injury. Observe general
safety precautions for handling equipment using high voltage. Do not locate or operate mast near electrical
lines, cables or other unwanted sources of electricity. Do not operate mast in lightning. Be certain electrical
cables are undamaged and properly terminated. Always disconnect power before performing service, repair
or test operations.
Safety Instruction - Read Manual! Failure to follow operating instructions could result in death or serious
injury. Read and understand the operator’s manual before using the mast.
Tip Over Hazard! Mast tip over could result in death or serious injury. Do not operate in high winds.
Operate on level ground only. Stand clear of mast and mast payload during operation. Be certain mast is
level and secure before and during installation, operation and maintenance.
Safety Instruction - Trained Personnel Only! Death or serious injury could result if proper inspection,
installation, operation and maintenance procedures are not observed. Installation, operation and
maintenance to be performed by trained and authorized personnel only. Proper eye protection should be
worn when servicing the mast.
Health and Safety Hazard! Solvent used to clean parts is potentially dangerous. Avoid inhalation of fumes
and also prolonged contact to skin.
Safety Instruction-Do not look at lights! Do not look directly into lights when they are illuminated.
Temporary impairment or permanent vision damage could occur.
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Night Scan Chief
SPECIFIC SAFETY PRECAUTIONS
The following are safety precautions that are related to specific procedures and therefore appear elsewhere in
this publication for emphasis. These are recommended precautions that personnel must understand and
apply during specific phases of installation, operation and maintenance.
Safety Instruction-Operation! For outdoor use only. Do not use in areas that have been classified as
hazardous as defined in Article 500 of the National Electric Code.
Crush Hazard! Death or serious injury could result if mast fails suddenly. Do not stand directly beneath the
mast or its payload. Be certain payload is properly installed and secured.
Burst Hazard! Over pressurizing mast will trip safety valve and could result in death or serious injury. Do not
exceed maximum operating pressure of 20 psi (138 kPa) for Standard Duty masts. Keep personnel clear of
safety valve exhaust direction.
Fire Hazard! Cleaning solvent, used for maintenance, is flammable and can be explosive resulting in death
or serious injury. Do not smoke. Use cleaning solvent in a well-ventilated area. Keep cleaning solvent away
from ignition sources. Always store cleaning solvent in the proper marked container.
Relocation Hazard! Relocating the mast during operation or after extension could result in death or serious
injury. Do not relocate the mast during operation or while extended. This applies especially to masts
mounted to vehicles. Operate the mast only if the vehicle is stationary and the vehicle engine is off.
Mast Extension Hazard! Extending mast into obstructions could result in death or serious injury and could
render the mast inoperable and partially extended. Before applying power and operating the mast, be certain
there is sufficient clearance above and to all sides of the expected location of the fully extended mast and
payload. Keep all persons clear of mast and mast extension. Do not lean directly over the mast.
Mounting Structure Hazard! Mounting mast into a structure unable to resist the forces generated from
customer-specific loading scenario could result in death or serious injury and could damage the mast. Before
operation, be certain mounting structure is capable of resisting forces generated from all loading and
environmental conditions, including, but not limited to, mast size and weight, payload size and weight, sail
size, wind speed, guy line arrangement, support bracket or roof line location and base plate assembly.
Electrocution Hazard! Do not touch live wires. Death or serious injury could result.
Safety Instruction – Operation! Make sure all power has been disconnected prior performing maintenance.
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Night Scan Chief
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Safety Instruction -Trained Personnel Only! Only trained and qualified personnel should perform
installation, adjustments, and servicing. Only a properly trained and qualified certified electrician should
perform electric installations and service.
When relamping an installed fixture, make sure all power to fixture is off and that the fixture is cool
Safety Instruction – Operation! At all times prior to mast operation, insure that:
1.) The mast area is free of personnel and mechanical obstruction;
2.) All electrical cables are undamaged and properly terminated;
3.) The operator must have full view of the mast during use;
4.) Any transit tie-downs on the payload have been removed;
5.) The vehicle is not moving;
6.) The area above the mast is free of mechanical obstructions.
Safety Instruction-Operation! Lamps are extremely hot and should not come into contact with people or
combustible and/or explosive materials. Do not operate if breakage occurs or unit is knocked over.
Entanglement Hazard! Tangled cables can cause equipment damage. Ensure control cables are not
tangled and are free to pay out as mast is extended.
Safety Instruction – Installation! At all times while using pipe and hose during installation, recognize that:
1.) Pipe and hose should be routed, mounted and restrained to protect from damage;
2.) Do not use second hand piping for installation;
3.) Do not bend air pipe and hose at a radius less than specified by the manufacturer;
4.) Pipes should be marked to avoid hazards from incorrect connection;
5.) The exhaust should be fitted with a silencer and be directed away from personnel;
6.) When routing piping, install in such a way as to minimize torsion on the joints;
7.) Mounting air pipe and hose shall be accomplished only by the use of tools to prevent readily
disconnecting air pipe and hose from mast.
Safety Instruction – Operation! Do not operate the Chief vertical RCP during an electrical storm.
Lifting Hazard! Manually lifting over 55 lb (25kg) is prohibited. In the UK, all lifting equipment must be
thoroughly examined annually by a competent person according to the Lifting Operations and Lift Equipment
Regulations 1998. Equivalent regulations exist in other EU states.
Safety Instruction – Operation! All operators must read the Operation section of this manual and be
properly trained.

Night Scan Chief
CHAPTER 1
INTRODUCTION
1.1 SAFETY PRECAUTIONS
Refer to the Safety Summary for precautions to be observed while operating or servicing this equipment.
1.2 INTRODUCTION
This manual covers the installation, operation, troubleshooting and maintenance instructions for the Night
Scan Chief. The manual should be reviewed in its entirety. Contact the Will-Burt factory with any questions
before performing any procedures outlined in this manual.
1.3 DESCRIPTION
The Night Scan Chief is a transportable lighting system consisting of a directionally adjustable group of lights
attached to a self-erecting, extensible mast. Air pressure required to extend the mast is provided by a
compressor unit mounted within the Night Scan Chief. The unit is designed for installation on any vehicle for
the purpose of providing on the scene temporary lighting. Refer to Figure 1-1 for identification of the major
components of the Night Scan Chief unit.
BASE
RIGHT COVER
BASE
LEFT COVER
RCP SADDLE
ASSEMBLY
LEFT SIDE
LIGHT
RIGHT SIDE
LIGHT
RCP HOUSING
RCP COVER
BASE
LOOK-UP LIGHT
MAST
Figure 1-1 Night Scan Chief Base and Remote Control Positioner
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Night Scan Chief
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1.4 REFERENCE DATA
The reference data for the Chief given in Table 1-1 is not inclusive of all models. Please refer to product
literature or www.willburt.com for additional information including length, width and height information.
Table 1-1. Reference Data Night Scan Chief
Model No. 140DC 300DC 1800 3000P 5400 6000
NS6 Stowed Height 10 in 10 in 10 in 10 in 10 in 10 in
NS7.5 Stowed Height 10 in 10 in 10 in 10 in 10 in 10 in
NS6 Ext. Height 6ft. 6ft. 6ft. 6ft. 6ft. 6ft.
NS7.5 Ext. Height 7ft-6in 7ft-6in 7ft-6in 7ft-6in 7ft-6in 7ft-6in
Total Unit Weight** 100 lb. 100 lb. 100 lb. 110 lb. 120 lb. 130 lb.
Tube Diameter Range 3.5 to 2.5in 3.5 to 2.5in 3.5 to 2.5in 3.5 to 2.5in 3.5 to 2.5in 3.5 to 2.5in
No. of Mast Sections 3 3 3 3 3 3
Mast Air Volume
(NS7.5) 0.26 cu. ft. 0.26 cu. ft. 0.26 cu. ft. 0.26 cu. ft. 0.26 cu. ft. 0.26 cu. ft.
Max. Operating
Air Pressure 20 psi 20 psi 20 psi 20 psi 20 psi 20 psi
Required DC Electrical
Power Supply 12V/20 amp 24V/10 amp 12V/20 amp 24V/10 amp 12V/20 amp 24V/10 amp 12V/20 amp 24V/10 amp 12V/20 amp 24V/10 amp 12V/20 amp 24V/10 amp
Required Electrical
Supply for Lights 12V/12 amp 24V/6 amp 12V/25 amp 24V/13 amp 220V/10 amp 220V/15 amp 220V/25 amp 220V/30 amp
*Maximum dimension is the largest dimension on all specified models.
**Weight given is approximate for 7.5-foot models
1.5 TECHNICAL INFORMATION
Power Requirements
The DC power for the Chief is supplied through direct connection to the base circuit board. The DC
power is internally protected with a 20 amp auto-resetting circuit breaker. The Chief will operate from
either 12 or 24 volt DC power with no customer changes necessary. The electronic system has built in
reverse polarity protection. For optimum performance, a minimum of 11 volts is required at the Chief
base. Long runs of cable can introduce power loss For long runs, it may be necessary to add an
intermediate junction box in the DC cable so that DC power can be applied closer to the Chief.

Night Scan Chief
Mast Loads
It is important that the mast be securely mounted to a sturdy platform, which will not overturn during
operational loading of the mast. Figure 1-2 provides loading information for the mast, which can be
expected during operation. All values given are in lbs.
35# 200# 200#575# 575#
Figure 1-2 Mast Loads
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Night Scan Chief
CHAPTER 2
INSTALLATION
Safety Instruction -Trained Personnel Only! Only trained and qualified personnel should perform
installation, adjustments, and servicing. Only a properly trained and qualified certified electrician should
perform electric installations and service.
Safety Instruction -Trained Personnel Only! Only trained and qualified personnel should perform
installation, adjustments, and servicing. Only a properly trained and qualified certified electrician should
perform electric installations and service.
Lifting Hazard! Manually lifting over 55 lb (25kg) is prohibited. In the UK, all lifting equipment must be
thoroughly examined annually by a competent person according to the Lifting Operations and Lift Equipment
Regulations 1998. Equivalent regulations exist in other EU states.
2.1 INTRODUCTION
The Chief has been designed to provide for ease of installation. This section of the manual provides the
procedures that must be followed to insure a successful installation. Be sure to read and understand the
entire installation procedure before you begin.
2.2 TOOLS AND MATERIALS REQUIRED FOR INSTALLATION
Table 2-1 provides a list of tools and materials required to install and test the Night Scan Chief.
Wrenches Crimping tool or Solder set
Screwdrivers Wire cutter/stripper
½ inch or M12 Mounting Hardware (6 each) Multimeter (to verify power is turned OFF)
Torque wrench Clean Shop Rags
Drill
Hoist (minimum 250 lb capacity)
Table 2-1. Tools and Materials Required for Installation
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Night Scan Chief
2.3 UNPACKING
Unpack the Night Scan Chief as follows:
1. Carefully open and remove all parts from shipping container.
oLift the unit from the shipping container by the base tube (see Figure 2-1).
oDo not lift the Night Scan by the lights or RCP.
2. Inspect for any shipping damage. If damage has occurred, notify carrier.
3. Be sure that all components are included and that the required tools are readily available.
LIFTING POINT
Figure 2-1 Lifting Point
2.4 ATTACHING TO VEHICLE
If the Night Scan Chief is to be mounted in a well, be certain that adequate drainage is provided. A minimum
of (4) drain holes (one per corner) at least one inch in diameter is recommended. While the unit has been
designed to withstand adverse environmental conditions, it cannot be submerged.
The mounting holes provided on the unit are 9/16 inches in diameter. There are four holes in the base plate
and two holes in the RCP saddle. Studs or bolts (not provided) shall be located on the vehicle in accordance
with Figure 2-2. It is important that the surface be flat such that the saddle and base plate are in the same
plane. The areas to which the unit is mounted must be reinforced to withstand loading as shown in Figure
1-2. Attach and torque all hardware as appropriate for its material and size. It may be advantageous to
attach the four (4) mounting bolts in the base plate, complete the wiring as outlined in the following sections
and raise the unit before attaching the saddle bolts. Be certain that the saddle bolts are located in
accordance with Figure 2-2 and that the saddle is centered with respect to the RCP. Adjust the location if
necessary.
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Night Scan Chief
33.0
40 1/8" (6FT. MAST)
11.0
46 1/8" (7.5FT. MAST)
SADDLE MOUNTING
HOLES (n.56" SEE NOTE)
BASE MOUNTING
HOLES (n.56" SEE NOTE)
4.8
2.4 5.5
Figure 2-2 Night Scan Base Mounting Hole Locations
Junction Box Installation
The junction box serves as an interface between the Hand Held Remote Control and the Night Scan
Base. It is not used in installations where only the Panel Mount Remote Control is used. The junction
box is not rated for installation in wet locations. The installer must take necessary precautions to seal the
lid and the knockouts if installation in a wet location is unavoidable. The junction box also serves as a
location to which DC power is routed by the installer for the unit. It may be flush or surface mounted.
Hardware for mounting is not supplied.
PUSH
PULL
SWITCH
HHRC CONNECTOR
JUNCTION BOX
ENCLOSURE
CORD GRIP FOR
DC \ CONTROL CABLE
TO NIGHT SCAN
HOLES PROVIDED
FOR OPTIONAL
FLUSH MOUNTING
KNOCK-
OUT
Figure 2-3 Standard Junction Box
Flush Mounting
For a flush mount installation, four #8 screws, nuts and lock washers must be provided by the installer.
The screw length should be 3 ½ inches plus the panel thickness. Remove the junction box cover and
make the necessary cable connections (see schematics in section 4.4). Place the junction box behind
the panel and guide the screws through the panel, junction box cover and junction box. Secure on back
side using lock washers and nuts.
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Night Scan Chief
Surface mounting
For a surface mount installation, four #8 screws, nuts and lock washers must be provided by the installer.
The screw length should be ¾ inch plus the panel thickness. Remove the junction box cover and mount
unit through the counter bored holes in the junction box. Secure on the back side using lock washers and
nuts. Make the necessary cable connections (see schematics in section 4.4) and replace cover.
5.75"
2.60"
MOUNTING HOLES
(Ø.19"SEE NOTE)
Figure 2-4 Junction Mounting Hole Locations
2.5 CONNECTING THE PUSH/PULL SWITCH (JUNCTION BOX)
While a two switch implementation of this circuit can be realized, the use of a Push/Pull switch is highly
preferred. One switch available for non-NFPA installations is a Square-D 9001KR9RH13. For NFPA
compliant installations, Square-D part number 9001SKR8RH25 should be used. Other manufacturers of
Industrial Control Pilot Devices should have equivalent switches. This switch is available as part of a pre-
wired kit (part # 913316 for NFPA or part #4204201 for non-NFPA installations) from Will-Burt. Refer to the
schematics in section 4.4 for wiring detail.
2.6 CONNECTING THE REMOTE CONTROL(S)
Hand Held Remote Control (HHRC)
In the event that the accessory kit (part # 913316 or 4204201) is not used, a suitable connector must be
supplied by the customer to mate with the connector of the handheld remote control (HHRC). The connector
on the HHRC is an ITT Cannon CA3106E14S-2P-B-F80-A232. Please refer to Table 2-2 and Figure 4-7 for
wiring schematic.
Pin B of the HHRC should connect to pin A of the DC Power/input connector. Pin C of the HHRC should
connect to pin B of the DC Power/input connector. Pin A of the HHRC should connect to pin C of the DC
Power/input connector. Pin D of the HHRC should connect to pin D of the DC Power/input connector.
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Night Scan Chief
Table 2-2. Handheld Remote Control Connector Pin-out
HHRC Pin Pin Function To Pin of DC Power
Connector Recommended Wire Ga.
A + Signal C 20
B + Power A 20
C - Power B 20
D - Signal D 20
Figure 2-5 Hand Held Receptacle Pins
2.7 CONNECTING THE INTERLOCK CONTACT (OPTIONAL)
The Chief provides an interlock relay contact output to enhance integration into vehicle safety circuitry. This
relay output is from a bi-stable (latching) relay whose contacts close when the unit has completely stowed.
This type of scenario gives the best failsafe condition in the event of a broken wire. Its state is not affected by
whether or not there is power to the mast. This isolated contact is capable of carrying up to 2 amperes and is
available on pins J4-8 and 9. Please refer to the schematics in section 4.4. Its usage is at the discretion of the
integrator. It can be used in conjunction with a customer-supplied relay to drive a flashing warning light. (refer
to Figure 2-6)
2.8 CONNECTING INTERLOCK INPUT CONTACTS (OPTIONAL)
Some customers may require preventing operation of the Chief unless other conditions are first met. An
example might be having the parking brake set. This can be accomplished by inserting an isolated contact in
series with the stop circuit of the Push/Pull switch. Inserting these contacts between the violet wire connected
to pin J4-6 base circuit board and the KA-1 contact of the Push/Pull switch breaks continuity and thus will
immediately stop operation of the Chief and prevent further operation until continuity is restored through the
contacts. Please refer to the schematics in section 4.4.
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Night Scan Chief
2.9 INSTALLING THE WARNING LIGHT
As required by NFPA regulations, a red flashing or rotating light, located in the driving compartment, must be
automatically illuminated whenever the vehicle parking brake is not fully engaged and the light tower is
extended. The warning light is wired into the system via the interlock contact described above. A customer
provided, normally closed pilot relay should be installed on pins J4-8 and 9 of the base circuit board. See the
wiring schematics in section 4.4. A customer supplied flashing relay and lamp may then be installed in the
driving compartment such that the driver can see the lamp. One example using a Bosch relay is shown
below.
30
87A
86
85
( - )
PIN- J4-8
R87
TO BATTERY ( + ) TO BATTERY
WARNING
LIGHT
BOSCH RELAY
0 332 209 151
OR EQUAL
PIN- J4-9
Figure 2-6 Example of Warning Light Installation
2.10 MULTIPLEX SYSTEMS OPERATING AT 24 VOLTS
When operating at 24 volts, the Night Scan Chief “chops” the voltage sent to the 12 vdc motors is the system.
As a result of this starting and stopping, voltage might be fed back through the power wires and into the
power supply. In some instances, this may lead to unexpected behavior in a multiplex system. In order to
mitigate this back feeding of voltage, an 820uF capacitor (Will Burt Part Number 204001) can be placed
across the positive and negative input terminals (TB3-5 and TB3-6) on the base circuit board. Please refer to
wiring schematic Figure 4-8. Note the direction of the capacitor for installation.
2.11 PRE-OPERATIONAL CHECK
Before beginning installation, make certain that the area is free
of overhead power lines and other unwanted sources of
electricity. Follow OSHA safety regulations when working near
energized power lines. Be sure to allow sufficient clearance on
all sides of mast to allow for side sway.
For outdoor use only. Do not use in areas that have been
classified as hazardous as defined in Article 500 of the
National Electric Code.
Do not use in the presence of flammable gases or liquids
such as paint, gasoline or solvents. Do not use in areas of
limited ventilation or where high ambient temperatures are
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