1756-L61 B B-Series Processor Units

1756-L61 B B-Series Processor Units

1756-L61 B asynchronous motor despite the simple structure, cheap, easy maintenance, but it is difficult to meet the requirements of the hoist start and speed performance, therefore, mine hoist AC drag system are selected winding as the main drag motor as an asynchronous motor, winding asynchronous motor rotor string resistance can limit the starting current and improve the starting torque, and can be within a certain range of speed regulation. The ground substation sends two 6kv power supply, one working and one standby.

1756-L61 B goes to the stator of the main motor through the isolating switch glk1 of the tgg-6 high-voltage switchgear, the oil switch gyd, the main contact of the high-voltage commutator line contactor xlc, and the forward (or reverse) contactor zc (or fc). Inside the high-voltage switchgear cabinet there are also voltage transformer yh, loss of voltage service debugging coil syq, current transformer lh and overcurrent debugging coil glq for loss of voltage or overcurrent protection. In the syq coil circuit there is also an emergency stop switch jtk1 connected in series and a commutator room bar gate blocking switch.

1756-L61 B mine hoist most of the use of wire-wound asynchronous motor to drag, and most occasions using stepwise switching rotor circuit resistance to achieve speed regulation. The braking system mostly adopts silicon controlled power braking and adjustable brake system. The former is electrical braking, the latter is mechanical braking. Elevator in the deceleration section of the operation, when the speed in the range of 0 ~ 5%, electrical braking, adjustable brake does not work; when the overspeed in the range of 5% ~ 10%, electrical braking limit, and maintain the maximum braking power, while adjustable brake works, the total braking torque increased