Northern Airborne Technology VR28 - Manual (Page 9)

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.