Optional weight carries plug braking QR2S control system of mode of lifting by crane

The utility model discloses an optional weight carries plug braking QR2S control system of mode of lifting by crane, hoisting mechanism motor M1 is parallelly connected excessively just, reversal contactor K11, K21 normally open contact is connected with the power, hoisting mechanism motor M1 rotor binding post be connected with rotor resistance R1, rotor resistance R1 respectively with contactor K40, K41, K42, K43 and/or K44 connect, it crosses master controller S40 and meets contactor K40 respectively to play to rise control circuit, K41, K42, K43 and/or K44's coil and just, reversal contactor K11, the K21 coil, master controller S40 crosses parallelly connected one -level contactor K44 of select switch QK and the additional contactor K44a coil of one -level, rotor resistance R1 is in contactor K44, the additional contactor K 44a of 43 indirect one -levels of K. The utility model discloses simple structure, reliability be high, can compromise underloading and heavy load and select convenient. 本实用新型公开种可选择轻重载