What is the electrical principle of the bridge double girder crane
Double girder cranes belong to a kind of more traditional machinery and equipment in today's society. So, do you know about bridge double girder cranes? Today I will come and take a look with you. What is the electrical principle of bridge double girder cranes?
1. The safety switch CAK installed on the hatch door of the control room and the safety switches 1AK and du2AK on the crane end beam lever door, as long as any safety switch is opened, the main contactor C will be automatically disconnected, thereby cutting off the power supply. Prevent the maintenance personnel from electric shock accidents on the walking platform.
2. Crane limit switch 1DXK, 2DXK; trolley limit switch 1XXK, 2XXK and lifting limit switch JXK. When the cart or trolley reaches the limit position or when the spreader rises to the specified height, the limit switch is activated, the contactor C is disconnected, and the power supply is cut off to ensure the safe operation of the crane. The control handle must be moved back to the zero position, and the start button must be pressed to turn on the power and start the motor in the opposite direction.
3. The main circuit total overcurrent relay contact 0JL and the overcurrent relay contacts 1JL, 2JL, 3JL and 4JL of each mechanism motor. It is used to protect each motor from short circuit or overload. When the motor current exceeds the setting value of the current relay, the relay acts, opening its contacts, and de-energizing the contactor C.
4. Zero contact 1-2 of each mechanism controller. It is used to ensure that the main contactor cannot be turned on when the control handle is not returned to the zero position, so as to prevent the motor from starting when the rotor resistance is cut off.
5. The emergency switch SK is for the operator to cut off the main power supply in an emergency.
The above is the whole content of "What is the electrical principle of the bridge double girder crane?", I hope everyone can understand and help you.
