Nat LD08 Operating instructions

Brand: Nat

Model: LD08

Type: Operating instructions

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

Part of

SM15

LD08

Lamp Dimmer Manual

INSTALLATION AND OPERATION MANUAL

REV 4.00 November 21, 2003

Northern Airborne Technology Ltd.

1925 Kirschner Road

Kelowna BC, Canada

V1Y 4N7

Telephone (250) 763-2232

Facsimile (250) 762-3374

SM15 Rev 4.00 LD08 Lamp Dimmer Manual

Nov 21, 2003 Page ii

ENG-FORM: 820-0109.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

Periodically NAT will release manual amendments. In order to maintain the most

accurate and up to date manual these amendments should be carried out immediately

upon receipt and recorded on the following amendment record.

AMENDMENT RECORD

Amendment

Number

Amendment

Date

Section(s)

Changed

Date

Entered

Entered By

Insert any Amendment Instruction sheets after this page.

SM15 Rev 4.00 LD08 Lamp Dimmer Manual

Nov 21, 2003 Page iii

ENG-FORM: 820-0109.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

Table of Contents

Section Title Page

1.0 Description

1.1 Introduction 1-1

1.2 Purpose of Equipment 1-1

1.3 Features 1-1

1.4 Specifications 1-2

1.4.1 Electrical Specifications 1-2

1.4.2 Physical Specifications 1-2

1.4.3 Environmental Specifications 1-3

1.5 Unit Nomenclature 1-3

2.0 Installation

2.1 Introduction 2-1

2.2 Unpacking and Inspection 2-1

2.3 Installation Procedures 2-1

2.3.1 Warnings 2-1

2.3.2 Notes 2-1

2.3.3 Cable and Wiring 2-2

2.4 Installation Options 2-2

2.4.1 Optional Dimmer Adjustment 2-2

2.4.2 NORM/EMERG BYPASS Switch 2-3

2.5 Post-Installation Checks 2-3

2.5.1 Voltage/resistance checks 2-3

2.5.2 System Checks 2-3

2.6 Continued Airworthiness 2-3

2.7 Installation Drawings 2-3

3.0 Operation

3.1 General 3-1

3.2 Operation 3-1

SM15 Rev. 4.00 LD08 Lamp Dimmer Manual

Nov 21, 2003 Page 1-1

ENG-FORM: 800-0106.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

Section 1.0 Description

1.1 Introduction

This manual contains information on the LD08 Lamp Dimmer.

Information in this section consists of purpose of equipment, features and specifications.

1.2 Purpose of Equipment

The LD08 is a bulkhead mounted dimming and lamp test unit, specifically designed to

handle the complex annunciator requirements of LORAN C/GPS systems sharing an

existing NAV system indicator.

The correct dimming and lamp test interface is provided for the RS08/PB08

combination, as well as six (6) additional discrete annunciators. This permits simple

integration of systems such as the Bendix/King Loran or Trimble GPS/Loran with the

nav switching functions of the RS08. It also provides central annunciation dimming

(day/night) selection and a central lamp test function, all on a single panel mounted

toggle switch. Optional interconnect permits adjustment of the annunciator dimming

with an external 10 kΩ potentiometer.

1.3 Features

Internal logic is provided to interface both the floating lamp connections of the PB08,

and annunciators triggered by a ground output. An adjustable lamp dimmer is provided

to drive eight separate 28 Vdc/40 mA lamp lines, each with individual short circuit

protection, surge limiting, and lamp test logic.

The dimmer may be operated in the preset mode (typically set in the 8-19 V range), or

as an adjustable dimmer via an external control. A single switch can be used to select

day, night, and lamp test functions.

The day operation mode also provides regulated 24 Vdc for all lamps, to prevent early

lamp failure and internal lamp blackening from excessive voltage.

All interconnect and relay contacts are gold plated. Relays are sealed, high vibration

rated (50 g shock), dry nitrogen filled units.

Circuit boards are constructed of G10-FR (flame retardant) material, with solder masks,

reflowed tin plating, and environmental post-coating.

LD08 Lamp Dimmer Manual SM15 Rev. 4.00

Page 1-2 Nov 21, 2003

ENG-FORM: 800-0106.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

1.4 Specifications

1.4.1 Electrical Specifications

Input Power +18 to 33 Vdc at 100 mA max. (excluding lamps)

Lamps Type 327/387 for 28 V (40 mA)

All lamp lines include ‘loop-through’ pins, to eliminate

the requirement for an external terminal block for

multiple connections

Logic Ground for lamp test

Ground for dimmer (or 10kΩ pot to ground)

Open for Day Operation (undimmed)

Annunciators 2 Floating circuits (For PB08/RS08)

6 Ground keyed circuits for system indicators

All short circuit protected

DIM OUT Direct connection to dimmer output, 320 mA max load

(8 ea. 40 mA lamps)

(Normally used for connection to RS08)

DIM IN Direct connection to internal lamp bus

1.4. 2 Physical Specifications

Height 1.63 in (4.14 cm)

Length 3.52 in (8.94 cm) (excluding connector)

Width 4.68 in (11.88 cm)

Mounting Bulkhead attachment (4 x 1032/AN3)

Weight 205g (7 oz.) (excluding mating connector)

SM15 Rev. 4.00 LD08 Lamp Dimmer Manual

Nov 21, 2003 Page 1-3

ENG-FORM: 800-0106.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

1.4.3 Environmental Specifications

Temperature -40°C to +70°C Ambient

-55°C to +85°C Survival.

Altitude 15,000 ft. max. (equivalent)

Humidity 95% Non-Condensing

Shock 12g (any axis)

1.5 Unit Nomenclature

The following list indicates the models available at the date of publication of this

document. Other models may be available.

Model Description / Distinction

LD08-001 8 circuits of lamp dimming or test functions

Correct interface to PB08 when used with RS08

6 additional lamp lines

28 Vdc operation

Day/night annunciator levels and lamp test

End of section 1.0

SM15 Rev. 4.00 LD08 Lamp Dimmer Manual

Nov 21, 2003 Page 2-1

ENG-FORM: 805-0104.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

Section 2.0 Installation

2.1 Introduction

Information in this section consists of: unpacking and inspection procedures, installation

procedures, post-installation checks, and installation drawings.

2.2 Unpacking and Inspection

Unpack the equipment carefully and locate the warranty card. Inspect the unit visually

for damage due to shipping and report all such claims immediately to the carrier

involved. Note that each unit should have the following:

- LD08 Lamp Dimmer

- Warranty Card

- Inspection Release

Verify that all items are present before proceeding and report any shortage immediately

to your supplier.

Complete the warranty card information and send it to NAT when the installation is

complete. If you fail to complete the warranty card, the warranty will be activated on

date of shipment from NAT.

2.3 Installation Procedures

2.3.1 Warnings

Do not bundle any lines from this unit with transmitter coax lines. In all installations, use

shielded cable exactly as shown and ground ONLY as indicated. Significant problems

may result from not following these guidelines.

2.3.2 Notes

The short circuit protection of the LD08 will cause an internal fusible resistor to fail

(open) if a permanently shorted lamp is connected. This will be immediately visible on

the lamp test function, but will require bench repair of the LD08 to correct. This circuit

protects the entire lamp dimmer bus from failure if a single lamp circuit should short

externally.

It is strongly recommended that the LL08 or PB08 lamps should be used for legend

annunciation, as they permit simple legend insertion, and are electrically matched to the

interconnect of the LD08.

LD08 Lamp Dimmer Manual SM15 Rev. 4.00

Page 2-2 Nov 21, 2003

ENG-FORM: 805-0104.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

2.3.3 Cable and Wiring

Use Tefzel Mil-M-27500, Mil-M-22759 or Mil-M-81044 single conductor and shielded

wire with solder sleeves (for shield termination) to make the most compact and easy to

terminate interconnect. Follow the wiring diagrams provided in Section 2.4 as required

for your version.

Allow 3 inches from the end of the wire to the shield termination to allow the hood to be

easily installed. Note that the hood is a "clamshell" hood and is installed after the wiring

is complete.

All wiring should be at least 22 AWG, except input power and ground connections which

should be 20 AWG. Ensure that the ground connection is clean and well secured. To

prevent system failure or inadequate equipment protection, power to this system must

be supplied from a separate breaker or fuse (1 A) and not bundled to any other source.

2.4 Installation Options

The normal installation of the LD08 requires a single toggle switch for the pilot's control.

It is recommended that the switch should be a SPDT center-off toggle, spring loaded in

the TEST position. Alternatively, the DIM function can be selected by a separate

switch, or tied into another switch function, and the lamp test can be activated by a

momentary pushbutton switch.

The switch should be connected to select between the following modes:

DIM Night flying lamp levels. To be adjusted either at the panel

or using the DIM LEVEL trimpot at the back of the LD08.

NORM Day flying lamp levels, full brightness.

TEST All lamps ON, full brightness. Tests functionality of all lamps.

The DIM position can also have a potentiometer connected in series with the switch, to

permit local adjustment of the night flying lamp level. The switch may also be integral

with the potentiometer to conserve panel space.

2.4.1 Optional Dimmer Adjustment

Inserting a 10 kΩ, 1/2 W linear taper potentiometer between the dimmer input and ground

will allow external adjustment of the dimming voltage. If using an external adjustment,

make sure internal trimpot is set for minimum voltage output (rotated fully ccw).

2.4.2 NORM/EMERG BYPASS Switch

SM15 Rev. 4.00 LD08 Lamp Dimmer Manual

Nov 21, 2003 Page 2-3

ENG-FORM: 805-0104.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

An optional external SPST toggle switch can be used to route an external voltage to the

lamps if the dimmer should fail.

2.5 Post-Installation Checks

2.5.1 Voltage/resistance checks

Disconnect the LD08 from its mating connector. Check pin 1 for 28 Vdc and pin 17 for

ground. Ensure that the lamp connections are correct, as mis-wiring may cause a

permanent failure of the LD08.

Ensure that no short circuits exist on any lamp line (lamp hi to lamp lo), and that no

press-to test lamp holders have been used. These cause one of the lamp lines to be

shorted to ground, which may damage the internal circuitry of the LD08.

2.5.2 System Checks

Install the LD08 and power up the ship’s systems. Ensure that operation is correct (DIM

LEVEL trimpot or switch), and that all lamps are fully functional. The system cannot be

accepted for service until all annunciations and lamp test/dim operations are correct.

Adjust the DIM LEVEL position to a nominal 14 Vdc, or to suit the pilot's preference.

2.6 Continued Airworthiness

Maintenance of the LD08 is ‘on condition’ only. Periodic maintenance of this product is

not required.

2.7 Installation Drawings

DRAWING REV. DESCRIPTION TYPE

LD08\001\903-0 1.00 LD08 Dimmer 3-D

LD08\001\403-0 1.01 Lamp Dimmer- Internal Dimming Interconnect

LD08\001\403-1 1.01 Lamp Dimmer - External Dimming Interconnect

LD08\001\403-2 1.01 Lamp Dimmer with RS08 - External Dimming Interconnect

LD08\001\405-0 1.01 Lamp Dimmer Connector Map

LD08\001\922-0 1.00 Lamp Dimmer Mech. Installation

Section 2.0 ends after these Drawings

Confidential and Proprietary to NAT

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Nat LD08 Operating instructions

Brand: Nat

Model: LD08

Type: Operating instructions

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Nat LD08 Operating instructions

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