| 摘要 |
<p>PURPOSE:To prevent a main circuit from becoming an overcurrent by not receiving a command from a driver's cab when the speed of a vehicle exceeds the prescribed speed but continuing to store the command which was given when the speed of the car was the prescribed speed or lower. CONSTITUTION:When a car is accelerated, a tachometer generator 4 produces an output, and when the speed of the car exceeds the prescribed value, the ground sides of electromagnetic valve coils 28, 29 are disconnected. Accordingly, after the main handle of a master controller 1 is set to a disconnecting position 13, a reverse rotation handle is shifted from a forward position 7 to a reverse position 9, and even if the handle is again advanced to 1-notch position 14 or 2-notch position 15, a reversing unit does not reverse, but holds the forward position. Since the reversing unit 43 is not shifted to the reverse side, a cam contactor 25 does not close, but an output signal 27 is not pressurized. In other words, if the forward command or reverse command instructed from the driver's cab is different from the stored forward command or reverse command, a main circuit is not formed.</p> |
