Northern Airborne Technology LD08 User Manual

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 [phone]

Facsimile [phone]

Copyright 2003 by Northern Airborne Technology

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM15 Rev 4.00 LD08 Lamp Dimmer Manual

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

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Insert any Amendment Instruction sheets after this page.

Nov 21, 2003 Page ii

ENG-FORM: 820-0109.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM15 Rev 4.00 LD08 Lamp Dimmer Manual

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

Nov 21, 2003 Page iii

ENG-FORM: 820-0109.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM15 Rev. 4.00 LD08 Lamp Dimmer Manual

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.

Nov 21, 2003 Page 1-1

ENG-FORM: 800-0106.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

LD08 Lamp Dimmer Manual SM15 Rev. 4.00

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)

Page 1-2 Nov 21, 2003

ENG-FORM: 800-0106.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM15 Rev. 4.00 LD08 Lamp Dimmer Manual

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

Nov 21, 2003 Page 1-3

ENG-FORM: 800-0106.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.