| 摘要 |
A system preventing undesired increasing of hoisting machine speed with asynchronous propulsion motor, containing two sensors of switching off reversing contactors, a sensor of switching off a dynamic braking contactor, a sensor of gin tub speed, while the outlets of those sensors are connected in a summation node whose outlet is linked with an execution relay, characterised by that a contactor (PW1) of the execution relay (PW) is located in a pressure regulator coil circuit (CRC) containing two setting elements (CN1 and CN2) of a brake pressure regulator current, and a manual voltage reference unit (RZN).
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