Northern Airborne Technology VR28-013 User Manual

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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 (250) 763-2232

Facsimile (250) 762-3374

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

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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.

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

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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

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ENG-FORM: 820-0110.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

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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

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

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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

=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

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

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

1.4.3 Miscellaneous Specifications

External Input Overcurrent Protection: 5 A External Circuit Breaker recommended

External Output Overcurrent Protection: 7.5 A External Fuse recommended

1.4.4 Environmental Specifications

Temperature:

Operating -20° C. to +55° C Survival -55° C. to + 85° C

Vibration/Shock DO-160C Cat B/M/N

Altitude 35,000 feet

Humidity 95% Non-condensing

End of section 1

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ENG-FORM: 800-0108.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

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

Section 2 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:

- VR28-013 DC/DC Power Converter

- Warranty Card

- Release certification

Verify that all items are present before proceeding and report any shortage immediately to your supplier.

2.2.1 Warranty

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.

Note: An appropriately rated facility, e.g. Certified Aircraft Repair Station, must install this

equipment in accordance with applicable regulations. NAT Ltd’s warranty is not valid unless the equipment is installed by an authorized NAT Dealer. Failure to follow any of the installation instructions, or installation by a non-certified individual or agency will void the warranty, and may result in a non-airworthy installation.

2.3 Installation Procedures

2.3.1 Warnings

Do not bundle any lines from this unit with transmitter coax lines. Do not bundle any logic or audio lines with this unit. Do not position this unit next to any device

with audio

interfaces, or significant audio interference will result.

2.3.2 Cautions

In all installations, use shielded cable exactly as shown, and ground as indicated. Significant problems may result from not following these guidelines.

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

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

2.3.3 Cabling and Wiring

All wiring should be at least 22 AWG, except power and ground lines, which should be at least 18 AWG. Ensure that all ground connections are clean and well secured.

All unshielded wire shall be selected in accordance with AC43.13-1B Change 1, Paragraphs 11-76 through 11-78. Wire types should be to MIL-W-22759 as specified in AC43.13-1B Change 1, Paragraphs 11-85, 11-86, and listed in Table 11-11. For shielded wire applications, use Tefzel MIL-C-27500 shielded wire with solder sleeves (for shield terminations) to make the most compact and easily terminated interconnect. Follow the wiring diagrams in Section 2.6 as required.

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 power and ground lines, which should be at least 20 AWG. Ensure that all ground connections are clean and well secured.

2.3.4 Post-Installation Checks

If any preset requires adjustment, be sure this is carried out before the aircraft leaves, and that the unit and its mating connector are secured before departure. Make all required log book entries, electrical load, weight and balance amendments and other paperwork as required by your local regulatory agency.

2.3.4.1 Voltage/resistance checks

Do not attach the VR28-013 until the following conditions are met.

Check the following:

a) Check harness pins <1>, <2> and <9> for +28 Vdc relative to ground.

b) Ensure +13 Vdc lines pins <6>, <7> and <14> are not shorted to ground.

c) Check P101, pins <4> <11> and <12> for continuity to ground (less than 0.5 Ω).

2.3.4.2 Power On checks

Power up the aircraft's system with the VR28-013 installed, and confirm that the unit is operating properly and the Power Output LED is on.

Double-check that the mounting and connector hardware is tightened securely.

Upon satisfactory completion of all performance checks, make the required log entries and complete the necessary Regulatory Agency paperwork before releasing the aircraft for service.

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ENG-FORM: 805-0109.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

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2.4 Continued Airworthiness

Maintenance of the VR28-013 is ‘on condition’ only. Periodic maintenance of this product is not required.

2.5 Accessories Required But Not Supplied

Installation kit p/n VR28-IKC (crimp) is required to complete the installation. The kit consists of the following:

VR28-IKC 15-pin D-min Female Crimp Kit (NAT Part No. D15SL-IKC)

Quantity Description NAT Part #

1 D-min 15 Socket Housing 20-21-015 15 MS Crimp Socket 20-26-901 1* Jack Screw Set 20-27-002 1* Lock Clip Set 20-27-004 1 15 Pin Connector Hood 20-29-015

* Use as required.