Required the controlling and power diagrams of an electrical hoist connections ?

[phatcreators]

Dear Sir !

Kindly provide me the controlling and power diagrams of an electrical hoist connections ?

there are 4 contactors (3 phase 400V contactors having 220V AC coil voltage)

1. for UP movement of the chain
2. for Down movement of the chain
3. for right movement of the hoist
4. for left movement of the hoist

There should be one overload connected to the contactor and one limit switch connection so that accidently if the up movement button latched on or its contactor latched on then the limit switch disconnect the supply so that no damage done.

thanks a lot

 

[chuckey]

There should be an input contactor that has an auxillary contact, that controls the ON/OFF function and the motor overload function. So you three phase goes through this contactor. The 230V for the coils, goes through a normally open contact that is in parallel with ON button. The OFF ( normally closed) button is in series with this line to the overload contact which then feeds one side of the coil (this point is the active 230V) the other side of the coil going to neutral.
Both the UP/DOWN and LEFT/RIGHT circuits are the same, two contactors side by side the 3 phase wired into them exactly the same on the output side two phases of ONE contactor are swopped over. A single pole change over switch with a centre OFF is wire to the neutral, each pole goes to one side of each coil, the other ends of the coil go to the "active 230V".
How it works:- When mains applied nothing happens. When ON button pushed overload contactor pulls in and its aux contact shorts out the ON button. If the OFF button is pressed the contactor falls out. The overload contacts do the same. If a UP button/switch is actuated, it feeds volts to the up/down motor. If the DOWN button /switch is actuated, it fires the same motor, but in the opposite direction.
Frank

 

[Darktrax]

Be aware that most hoist control button stacks include the means to activate more than one winch speed.
Some have "separate "fast" and "slow" buttons, while others have 2-stage tactile button depression.
All include the larger emergency E-STOP. Most left-right winch control requires the ability to "jog" or approach
final position slowly.

Modern motor speed control usually use inverters which can easily deliver high torque at high slip,
so can run slow, and which include the various start/stop/reverse inputs.

Addressing the safety and operation of hoists. The E-STOP circuit is now no longer a simple opening
switch in a contactor latching circuit. Dual-contact switches are used with a properly specified safety
relay. Many modern inverter controls are now fully qualified with internal circuits that provide safety
relay functions internally, and can guarantee to STOP using direct connected dual E-STOP switches.

Do not neglect the BRAKE function of the hoist. Most are automatic when the motor is powered,
BUT require a full voltage applied, and so require special attention if the voltages to the motor
are derived from a speed control inverter. In that case, the BRAKE release activation energy must
be connected separately, not simply to borrow the applied motor voltages.

Complete circuits are available free from suppliers of the rugged control switch stacks, and/or, motor
speed controllers, The best kinds come as an assembly that dangles from the hoist on a strong strain
relief chord, and the various circuits suitable are with the documentation.

I hope this helps..
Figuring out this sort of circuit from scratch, or applying a circuit derived from some study is not very
difficult, but if you are at all unsure, seek direct help. Getting these things wrong risks harm to the people
who would use it, and expensive damage when it gets moving with a poorly designed control.

 

[phatcreators]

any schematic and wiring diagram that i asked ???