Northern Airborne Technology VR28-013 User Manual

SM32A

VR28-013
DC/DC Power Converter

Serial Numbers 1221 and later

INSTALLATION AND OPERATION MANUAL

REV 4.00 Aug 21, 2006

Northern Airborne Technology Ltd.

1925 Kirschner Road

Kelowna, BC, Canada.

V1Y 4N7

Telephone [phone]

Facsimile [phone]

Copyright 2006 by Northern Airborne Technology

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM32A Rev 4.00 VR28-013 DC/DC Power Converter 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

Amendment

Number

Note: Revision 4.00 is the first public release of this document

Amendment

Date

Section(s)

Changed

Date

Entered

Entered By

Insert any Amendment Instruction sheets after this page.

Aug 21, 2006 Page ii

ENG-FORM: 820-0110.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM32A Rev 4.00 VR28-013 DC/DC Power Converter Manual

Table of Contents

Section Title Page

1 Description

1.1 Introduction 1-1

1.2 Purpose of Equipment 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 Miscellaneous Specifications 1-3

1.4.4 Environmental Specifications 1-3

2 Installation

2.1 Introduction 2-1

2.2 Unpacking and Inspection 2-1

2.2.1 Warranty 2-1

2.3 Installation Procedures 2-1

2.3.1 Warnings 2-1

2.3.2 Cautions 2-1

2.3.3 Cabling and Wiring 2-2

2.3.4 Post-Installation Checks 2-2

2.4 Continued Airworthiness 2-3

2.5 Accessories Required But Not Supplied 2-3

2.6 Installation Drawings 2-3

3 Operation

3.1 Introduction 3-1

3.2 General 3-1

3.3 Operation Specifics 3-1

Aug 21, 2006 Page iii

ENG-FORM: 820-0110.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM32A Rev 4.00 VR28-013 DC/DC Power Converter Manual

Section 1 Description

1.1 Introduction

This manual contains information on the VR28-013 DC/DC Power Converter (serial
numbers 1221 and later). All derivative products will be covered by manual
supplements, which can be obtained from NAT as required.

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

1.2 Purpose of Equipment

The VR28-013 is an efficient voltage converter designed to power non-aircraft radios or
equipment from a 28 Vdc aircraft power buss. It is a remote bulkhead mounted unit
designed to convert a nominal +28 Vdc input to a nominal +13 Vdc output at up to 6 Amps.

1.3 Features

The VR28-013 uses the same switched-mode power supply (SMPS) circuitry utilized by
NT-series radios to provide constant output power without excessive heat generation.

The unit has remote on/off switching.

An output power LED is provided to give a visual indication that the unit is operating.

Power In, Power Out, and Ground pins are grouped together and internally connected
for installation versatility.

The unit has over-voltage and reverse-voltage protection to ensure operation in severe
aircraft environments.

1.4 Specifications

1.4.1 Electrical Specifications

Power Supply: Switched-mode regulated power supply with input reverse-polarity, over-

current, over-voltage, and output short-circuit protection.

Operating Voltages
Nominal +28.0 Vdc

Minimum +22.0 Vdc

Maximum +30.3 Vdc

Emergency +18.0 Vdc

Aug 21, 2006 Page 1-1

ENG-FORM: 800-0108.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

VR28-013 DC/DC Power Converter Manual SM32A Rev 4.00

Current Consumption

Standby 0.03 A nom. (Off)

No Load 0.1 A nom. (@ I

Low Current Load 0.5 A nom. (@ I

0.8 A nom. (@ I

High Current Load 2.0 A nom. (@ I

4.0 A nom. (@ I

=0.0 A)

OUT

=0.6 A)

OUT

=1.2 A)

OUT

=3.0 A)

OUT

=6.0 A)

OUT

Power Output

Intermittent Operation +13.0 Vdc ±10%, 6.0 A max.

Continuous operation +13.0 Vdc ±10%, 20% duty cycle:

1 minute at I
4 minutes at I

=6.0 A,

OUT

OUT

=1.2 A

Efficiency 80% typical

Input Overcurrent Protection Internal Fuse, 7 A capacity

Input Signals

Power On/Off: Voltage: <1 Vdc (logic LO) for ON

Current: 15 mA nom., sink

Output Signals N/A

1.4.2 Physical Specifications

Height 1.85" (47.0 mm) max

Depth 5.32" (135.1 mm) max

Width 3.99" (101.3 mm) max

Weight 1.02 lbs (0.46 kg) max

Mounting Remote bulkhead mount with four 10-32 screws

Material/Finish:

Chassis and cover Brushed aluminum with chromate conversion finish

Heatsink Aluminum extrusion with clear anodized finish

Connectors: J3 Male 15 pin D-submin connector with jackposts

Page 1-2 Aug 21, 2006

ENG-FORM: 800-0108.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.