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28.5 VDC Ground Power Unit
Models:
11A6647-1000/1010
11B6647-1000/1010
11C6647-1000/1010
11D6647-1000/1010
11A6647C1000/1010
11B6647C1000/1010
11C6647C1000/1010
11D6647C1000/1010
11A6655-1000/1020
11B6655-1000/1020
11C6655-1000/1020
11A6655C1000/1020
11B6655C1000/1020
11C6655C1000/1020
11D6655C1000/1020
11A6665-1000/1010
11B6665-1000/1010
11C6665-1000/1010
11A6666-1000
11B6666-1000
11C6666-1000
12/2006 - Rev. 04
- 1 -
This product can not be modified without the written approval of Tronair, Inc. Any modifications done without written
approval voids all warranties and releases Tronair, Inc., its suppliers, distributors, employees, or financial institutions
from any liability from consequences that may occur. Only Tronair OEM replacement parts shall be used.
1.0 INTRODUCTION
Many systems and devices in the aerospace industry, and other fields, require a DC voltage of 28 volts.
As this cannot be supplied by the utility directly, converters are employed which supply the necessary voltage
and eliminate supply irregularities to a limited extent.
Normally these units are used to supply smaller aircraft with electric power. There are special reasons why
aircraft need a 28V DC voltage for internal supply. To save costs in maintenance and operation, and also for
environmental reasons, aircraft are supplied by external electrical power supplies when they are parked at
airport terminal stands with their engines shut down.
This manual describes the Tronair 28V Ground Power Unit (GPU). If you follow these instructions you will be
able to handle the equipment with confidence and utilize all its facilities.
NOTE
1. Naturally an operating manual cannot cover every conceivable installation, operating,
maintenance or servicing situation. Should problems arise, or if the data in this manual is not
sufficiently detailed, please contact your local Tronair representative who will be pleased to
give further assistance.
2. If the equipment is installed for use as an aircraft ground power system, please pay
particular attention to Section 10, which summarizes the special features of this type of
application.
1.0 Introduction continued on following page.
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