. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography that could be commanded manually and automatically. Tower orientation along either of two horizontal axis and power supply condition were also to be measured. Since only two channels of measure- ment telemetry were available, additional measure- ment selection commands were required. One channel was dedicated to the primary measurement of torque and the second channel was selected on shipboard to measure any of the remaining three parameters. A two
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography that could be commanded manually and automatically. Tower orientation along either of two horizontal axis and power supply condition were also to be measured. Since only two channels of measure- ment telemetry were available, additional measure- ment selection commands were required. One channel was dedicated to the primary measurement of torque and the second channel was selected on shipboard to measure any of the remaining three parameters. A two level bidirectional command signal was used between the surface vessel and the tower. The five possible states of this current were used as commands. The number of possible control actions was augmented by nonexecution of some commands until the command current was terminated. As an example, the torque measuring system was electrically calibrated during the time the "penetrate" command existed, but penetration did not begin until after release of the command current and removal of the calibration. The circuit of a logic system of ten, DPDT, 6 volt dc relays is shown in Fig. 2. Diodes Command Imput tram Shlp'i CobK. K( Rotract l_jT__rrm_ ** "â *" From 120 vox Kk> Foot Marker -11-HtHâ(Jr â¢o "jo HIâNormally Opon âCJ3â NofWWHf Clotod Swilehot Kao HIâ â1|-^â. ccw ftotract Ponotrolo To Stopping Fig. 2 Command Decode and Logic D, and D2 are steering diodes to separate two command current directions. Relays K-| and Kâ coils were rewound with approximately ten times the number of turns as were K2 and K4 so that these two respond to lower current levels. Diodes Dj, D^, Dg, and Dfi suppress inductive surges while D, and D, also act as voltage limiters across K, and K3. The contact closures of any command relay circuit supply 6 vdc to an inverter for conversion to 115 volts 60 HZ power to power measurement devices and to drive the step motors. Power
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