| 摘要 |
<p>PURPOSE:To prevent a defect due to the voltage drop of a power source by detecting the moving position of a moving machine to which a current is supplied from a trolley wire and varying the upper limit of a speed reference of a device for driving the machine to limit the maximum speed. CONSTITUTION:A speed reference value V0 from a controller 2 on a moving machine to which a current is supplied from a trolley wire is applied to a speed reference circuit 3. A traveling position detector 4 detects the traveling position, and inputs a signal V1 in response to the position to the circuit 3. The circuit 3 controls a drive controller 1 by a speed reference value V2 limited by a traveling position signal V1 at the upper limit of the speed reference value V0. Thus, the maximum speed is delayed at the ground point remotely from a current supply point where the voltage drop is large to prevent the control mistake due to the voltage drop.</p> |
