| 摘要 |
PURPOSE:To enable monitoring of trouble to be achieved to an entire extent ranging from 'Acceleration Time', 'Constant Speed Time' and 'Deceleration Time', by comparing speed deviation signal's polarity and determining it as occurrence of a trouble if they do not agree with each other. CONSTITUTION:A speed commanding signal Nr and an actual speed signal Nf are put into a comparing circuit 1 to obtain a speed deviation signal DELTAN and put into a comparing circuit 5 through a shaping circuit 3. On the other hand, the actual speed signal Nf is also put into a differential circuit 2 to obtain a speed varying signal Nf' and put into the comparing circuit 5 through a shaping circuit 4. In the comparing circuit 5, the both polarities are compared in such a manner, for instance, as to subtract Nf' from DELTAN, and a trouble signal is to be issued if the polarities failed to agree with each other. |
