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Description, 1 introduction, 2 purpose of equipment – Northern Airborne Technology VR28 User Manual

Page 9: 3 design features, 4 specifications, 1 electrical specifications

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SM32 Rev. 4.00

VR28-013 Voltage Regulator Manual

Section 1.0 Description

1.1 Introduction

The VR28-013 is a bulkhead mounted Voltage Regulator. Its adjustable output is
normally set to +13.0 Vdc with a maximum current of 5.5 Amps.

Note: Although only one model is currently available, a major revision was

implemented for serial numbers 1033 and following. The information contained
in this manual pertains to both revisions except where noted.

1.2

Purpose of Equipment

The VR28-013 is specifically designed to provide a method for installing +12 or +14 Vdc
equipment into an aircraft that has only +28 Vdc available.

1.3

Design 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

Input Power:

24.8 to 29 Vdc.


Supply Current:

3.2 Amps at maximum load.


Output Power:

Adjustable from +7 to +14 Vdc.


Output Current:

5.5 Amps (maximum) at 13.0 Vdc.

Nov 10, 2003

Page 1-1

ENG-FORM: 800-0106.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.