| 摘要 |
PURPOSE:To facilitate the control, by converting an antenna output into digital signals and then into an absolute deflection degree and a traveling angle and then producing a speed difference between two motors after comparing the above-mentioned deflection degree and the traveling angle with each reference value. CONSTITUTION:Receiving a timing signal from a clock oscillating part 15, an angle calculating part 16 reads signals Dt and Dt-1 out of a storage part 14 and calculates an angle thetaT=(Dt-Dt-1)/t. This angle thetat is compared with a set reference angle theta1 of a reference angle setting part 17 through an angle comparing part 21. It shows that an antenna 2 gets slowly out of an electric wire 3 if theta1> thetat is satisfied. In this case, the signal Dt is read out of the part 14 through a distance comparing part 23 and compared with a set reference distance D2 of a reference distance setting part 19. Then in the case of Dt>=D2 (at and after point F), the positive or negative polarity is decided at a polarity deciding part 29 for the output signal of an A/D converter 13. Then a set relay is decided for a crane to move toward the polarity opposite to the decided polarity. |
