TM 9-4940-568-10
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Section III. PRINCIPLES OF OPERATION
1-11. SYSTEMS INTRODUCTION.
This section provides a basic explanation of major systems on the FRS. Detailed operation information is provided in
Chapter 2.
1-12. ELECTRICAL SYSTEM.
The electrical power for the FRS unit is provided by a 35KW Generator Set (1). The electrical system is composed of
a 24 VDC system and 120/208 AC system. The 24 VDC system provides electrical current for the crane (2),
domelights (3), heater (4) and portable flashlights (5). Electrical power for the 24 VDC system is provided by two 12
volt series connected batteries (6). The alternator (7) on the engine of the generator set maintains battery charging and
equipment operation. Manual resetting circuit breakers are used for the different systems. Circuit breakers are
located in the 24 VDC control panel (8) inside shelter of the FRS.
The 120/208 VAC system provides power for the welder (9), air compressor (10), 110 receptacles (11), reel lights (12)
and fixed lighting system (13). Electrical power for the 120/208 VAC system is provided by the 35KW generator set
which is powered by a 239 cubic inch (3.9 L) diesel engine. Circuit breakers for the 120/208 VAC system are located
in main panel (14) inside shelter of the FRS.
10
1
2
11
5
9
13
14
3
4
12
8
7
6
13
