Operations and Maintenance Manual Power Distribution
Version 1.2 - June 2004 6 - 3
POWER DISTRIBUTION
INTRODUCTION
For the electrical schematics refer to the engineering drawings labeled 118168E_
(electrical). Part locations for most of the electrical components are found on the
engineering drawings.
Each wire is identified at its termination points by alphanumeric characters in black on
a white tape background. Each wire is labeled in the electrical schematics by its
identification mark in round circles. Electrical components called out by name also
have a part number following the name.
AC DISTRIBUTION
The required inhouse electrical power is three-phase, 208 VAC,
45 amperes. Inhouse electrical power terminates to the main power circuit breaker
1CB. The circuit breaker is a single throw, 45-amp rated circuit breaker. From the
main power circuit breaker, wires 1L1, 1L2, and 1L3 carry AC electrical power to the
contacts of the main contactor. From the main power circuit breaker, AC power
branches out to transformer 1T via wires 1L2 and 1L3. Transformer 1T is a step
down transformer providing 24 VAC for the power up circuit and interlocks,
described in the Power Up and Interlock sections of this chapter, below.
The main contactor completes the three major arterial wires 2L1, 2L2, and 2L3 to
provide three-phase AC electrical power throughout the remainder of the machine.
AC electrical power is branched from the three major arterial wires to individual
subassemblies and components by terminal strip 8TS.
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