Figure 6-3.Steering system block diagram.

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Figure 6-3.—Steering system block diagram. The following paragraphs explain a normal operating setup for pilothouse steering control of the complete system. PORT SYSTEM—Main and servo pump motors #2 operating; port receiver selector switch to #2 position, steering gear port cable select switch to the port cable position; IC cable selector switch (port system section) to the port cable position; and IC and pilothouse transmitter selector switches to the pilothouse position. STARBOARD SYSTEM—Main and servo pump motors #1 operating; starboard receiver selector switch to the #1 position; steering gear starboard cable selector switch to the starboard cable position; and IC cable selector switch (starboard system section) to the star- board cable position. When the control switches are set up in this manner, the motor and stator leads of the synchro transmitter at the pilothouse steering station are paralleled with the rotor and stator leads of the starboard #1 and port #2 synchro receivers in the steering gear room. 450 volts single phase is applied to the stator leads from main motor controllers #1 and #2. (The synchros have two stator and three rotor leads.) Due to synchro action, the receiver rotors will now follow all movements of the transmitter rotor and thus actuate the hydraulic system to move the rudders in response to the helm. SINGLE-LINE DIAGRAM.—This type of dia- gram shows a general description of a system and how it functions. It has more detail than the block diagram; therefore, it requires less supporting text. Figure 6-4 shows a single-line diagram of the ship’s service generator and switchboard connections for a destroyer. It shows the type of ac and dc generators used to supply power for the ship. It also shows in simplified form actual switching arrangements used to parallel the generators, to supply the different power lighting busses, and to energize the casualty power terminals. EQUIPMENT WIRING DIAGRAM.—Earlier in this chapter, we said a block diagram is useful to show the functional operation of a system. However, to troubleshoot a system, you will need wiring diagrams for the various equipments in the system. The wiring diagram for a particular piece of electri- cal equipment shows the relative position of the various components of the equipment and how each individual conductor is connected in the circuit. Some examples are coils, capacitors, resistors, terminal strips, and so on. 6-6

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