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16
ELECTRICAL CIRCUITS
 
A. LOG ELECTRICAL CIRCUITS
 
16A1. Types of circuits. (See Figure 16-1.) All electrical circuits that connect the underwater log are known as Y circuits. The Bendix underwater log is equipped with the following circuits:

1Y-Speed transmission circuit
2Y-Distance transmission circuit
3Y-Constant frequency supply

16A2. 1Y circuit. The 1Y circuit is the basic circuit in the Bendix underwater log system since a speed indication is first obtained in the master transmitter indicator, and then the distance is obtained by integrating the speed by means of the follower and rotating disk in the same instrument. The 1Y circuit includes the 1Y1 circuit which is shown separately, since it supplies 115-volt alternating current to the log power motor which positions the main force arm and gives a speed indication. The balance of the 1Y circuit is used to transmit speed indications to the repeaters, torpedo data computer, and into the speed corrector of the gyro compass through switches on the interior communication board. Note that the R1 and R3 leads are reversed in the wiring of the repeater,

  since the repeater and transmitter rotate in opposite directions.

16A3. 2Y circuit. The 2Y circuit supplies 115-volt alternating current to the follow-up motor in the master transmitter indicator. The follow-up motor supplies the torque required to drive the distance transmitter. In addition, the 2Y circuit is used to transmit, by means of self-synchronous motors, distance readings to the repeaters and the dead reckoning tracer. Control switches for the 2Y circuit are mounted on the interior communication board.

16A4. 3Y circuit. The 115-volt 60-cycle alternating current supply driving the constant speed motor in the master transmitter indicator is the 3Y circuit. As this current is used for timing, its frequency must be held to 60 cycles. For this reason a constant frequency control unit is generally supplied, with an alternative position on the circuit switch which connects to the ship's alternating current supply. On some of the latest submarines the frequency of the ship's alternating current is accurate enough, and no constant frequency control unit is required.

 
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Figure 16-1. Bendix log wiring diagram.
Figure 16-1. Bendix log wiring diagram.
 
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