Northern Airborne Technology LD12-002 User Manual

Installation and Operation Manual

LD12-002

LED Dimmer

SM85

ISSUE 1.00

Northern Airborne Technology Ltd.

1925 Kirschner Road

Kelowna, BC, Canada.

V1Y 4N7

Telephone [phone]

Facsimile [phone]

Issued on the authority of Northern Airborne Technology Ltd.

Copyright 2010

LD12-002 LED Dimmer

SM85 Installation and Operation Manual

Prepared By: Checked By: Approved By:

The status of this installation and operation manual is controlled by issue shown on the title page. The
status of each section is controlled by revision shown in the footer of each page. All revisions affecting
sections of this manual have been incorporated into the latest issue.

ISSUE/REVISION RECORD

Manual Issue

Number

Section

Revision Number

Revision Description Issue Date

1.00 Section 1 Rev: 1.00

Initial release Mar 16, 2010
Section 2 Rev: 1.00
Section 3 Rev: 1.00

Installation and Operation Manual Page ii

ENG-FORM: 820-0115.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

LD12-002 LED Dimmer

SM85 Installation and Operation Manual

Table of Contents

Section Title Page

1. Description

1.1 Introduction 1-1

1.2 Product Description 1-1

1.3 Design Features 1-1

1.3 Features 1-1

1.4 Specifications 1-1

1.4.1 Electrical Specifications 1-1

1.4.2 Physical Specifications 1-2

1.4.3 Environmental Specifications 1-2

2. Installation

2.1 Introduction 2-1

2.2 Unpacking and Inspection 2-1

2.2.1 Warranty 2-1

2.3 Continued Airworthiness 2-1

2.4 Installation Procedures 2-1

2.4.1 Warnings 2-2

2.4.2 Cautions 2-2

2.4.3 Cabling and Wiring 2-2

2.4.4 Installation Variations 2-3

2.4.5 Optional Dimmer Adjustment 2-3

2.4.6 Optional Emergency Bypass Switch 2-3

2.4.7 Post-Installation Checks 2-3

2.5 Adjustments and Connections 2-4

2.6 Accessories Required But Not Supplied 2-4

2.7 Installation Drawings 2-5

3. Operation

3.1 Introduction 3-1

3.2 General Information 3-1

Installation and Operation Manual Page iii

ENG-FORM: 820-0115.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

LD12-002 LED Dimmer

SM85 Installation and Operation Manual

Section 1 Description

1.1 Introduction

Information in this section consists of product description, design features and specifications for the
LD12-002 LED Dimmer. All derivative product information will be contained in the applicable manual
supplement, which may be obtained from Northern Airborne Technology Ltd. as required.

Review all notes, warnings and cautions.

1.2 Purpose of Equipment

The LD12-002 is a remote mounted light dimmer module, designed for complicated annunciator
requirements in Loran / GPS systems. The unit is capable of controlling 12 independent LEDs with full
test function. In its basic mode of operation, the LD12-002 can be used as a bulk LED dimmer, outputting
up to 1 amp of current. The LD12-002 unit can be easily interfaced with all NAT RS-series remote switch
products used in Loran / GPS installations.

1.3 Features

Internal logic is provided to interface to both the floating LED connections of the PB08, and annunciators
triggered by a ground output. An adjustable LED dimmer is provided to drive twelve separate 28 Vdc/50
mA LED lines.

The dimmer may be operated in the preset mode (typically set in the 12-24 V range), or as an adjustable
dimmer via an external control. A single switch can be used to select day, night, and LED test functions.

The day operation mode also provides regulated 24 Vdc for all LEDs, to prevent early LED failure and
internal LED 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.

1.4 Specifications

1.4.1 Electrical Specifications

Input Power +24.8 Vdc to +30 Vdc, +27.5 Vdc nominal (reverse and

over voltage protection)
Input Current 50 mA idle (2 A max.)
Inputs
Test Keyline Active low input. Grounding this pin will cause all LEDs

to illuminate at full brightness.

Section 1 Rev: 1.00 Issue 1 Page 1-1

ENG-FORM: 800-0116.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

LD12-002 LED Dimmer

SM85 Installation and Operation Manual

Dimmer Active low input. Grounding this pin will cause the

internal preset dimmer voltage to be supplied to all

Dimmer Ground Provides a convenient ground return for the dimmer

LED Power In Direct connection to internal LED bus.
LED Keys Active low keyline. Grounding this pin will cause the

Outputs
LED Outputs 0 mA to 50 mA of current to 2 floating LED circuits and 10

Dimmer Out Direct connection to dimmer circuit output.
Provides up to 1 A of current.

LEDs.

controls.

selected LED to illuminate. Current drawn will depend on

type of LED used in circuit. Pin should be left open when

unused.

ground keyed circuits for system annunciators.

1.4.2 Physical Specifications

Height 1.78 inches (45.1 mm) max
Length 5.29 inches (134.4 mm) max
Width 3.99 inches (101.3 mm) max including flanges
Weight 0.84 lbs (380 g) max
Mounting Bulkhead attachment (4 x 10-32 screws)

1.4.3 Environmental Specifications

Temperature -15° C to +70° C (ambient)

-55° C to +85° C (survival)
Altitude 50,000 feet max
Humidity 95% Non-condensing Cat. A

Vibration Conforms to DO-160C, Cat. B, M, N

Section 1 ends

Section 1 Rev: 1.00 Issue 1 Page 1-2

ENG-FORM: 800-0116.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.