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,
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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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