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The mechanisms are always used at full power. When hoisting, the speed is optimized according to the load and command used. In distribution, progressive variation of speedand the maximum speed are adapted to the weight of the load. In orientation, there is controlled proportionalspeed with optimal acceleration and deceleration in accordance
with the maximum admissible torque for the mast.
The auxiliary winch can be used on the derrick: this provides users with the possibility of a motorized derrick at the base of the machine.

DVF Distribution
The jib-footDVF mechanism is easily accessible in total safety.
Progressive speed variation by proportional control.
The speed depends directly on the controls manipulated by the crane operator.
To make driving the crane easier, 2 hard spots integrated into the controlsprovide better pinpointing of the speed.

With different mechanisms (33 to 150 LVF Optima or 108 to 215 hp LBR), MD cranes are capable of high working speeds through optimizing speed in accordance with the load hoisted, allowing for gains in productivity.
•  For the first increments (approach speed, sling tension, etc.) hoisting of the load is controlled by the load security
device (a proving ring).
•  For working speeds, the Optima system adapts the speed in accordance with the load hoisted. This enables full power of the motor to always be used for optimum productivity.
The LVF Optima provides a gain of around 25% in descending speed.

RVF + orientation
The RVF Optima + orientation enables gentle rotating movements without jerking.
Fully integrated progressive control.
Driving adapts to the behavior of the crane operator:
•  Traditional driving thanks to action controlled by stoppage of the command. The slow-down phase of the jib is managed by the frequency variator in this case.
•  Or by an inverted command in the slow-down phase, called a «counter-orientation» command.
As a result, the crane operator can control stoppage.

The design of the electric sockets allows simple and quick connectionon all sites.
Whilst operating or transporting, the cables are integrated and/or stored easily in the crane, increasing the service life of the electrical equipment and providing optimal conditions of safety.
•  There is a special channel for electric wiring in the counter-jib.

Considered to be the parent range to tower cranes,
MD cranes have been around since the beginnings of the Potain brand. This range is the pillar of all Potain product know-how.
Constantly evolving to meet market expectations, these cranes are equipped with the latest technological innovations and boast the best performance possible.

Technical characteristics
•  Jib lengths of between 30 m and 80 m, per 5 m section.
•  Max. load of 10 to 40 t.
•  Hoisting power ranging from between 50 and 150 horsepower.
•  The masts used are K400 (1.6 m), K600 (2 m), K800 (2.45 m) and K850 (2.45 m, reinforced).

All the components of the MD range are designed to minimize the total number of trucksrequired to transport them between sites.

The jib components can house the jib tiesto make transport easier and quicker.

Thanks to the factory-performed pre-reeving and the auxiliary winch supplied as standard, assembly of the jib and counter-jib ties can be carried out quickly and in total safety.

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Q:A crane is lifting a 500kg payload straight up at a constant speed of 0.7ms-1.?
a) As the crane is lifting at constant speed, there is no acceleration on the payload, therefore the net forces on the payload are equal to 0. Therefore the crane overcomes just the force of gravity = 500*9.81 = 4905 N Power = force * velocity = 4905 * 0.7 = 3433.5 W b) distance = speed * time = 0.7 * (2 * 60) = 84 m c) assuming that the cable breaks while it is still going up at 0.7 m/s, therefore initial velocity upwards = 0.7 m/s. using v² = u² + 2as: v² = 0.7² + 2(-9.8)(-84) = 1646.89 v = √(1646.89) = 40.9 m/s the payload will be travelling at 40.9 m/s when it hit the ground.
Q:how does the power electronic drives employed in cranes?
The primary function of an electronic drive is to provide for operation at various speeds. Slow speed operation is used when moving a load into position. Faster speeds are used for moving loads over longer distances. When the operating speed is steplessly adjustable, ramped acceleration and deceleration control is easily provided as well. Controlled acceleration provides smoother operation because acceleration at a constant rate means accelerating with a constant force or torque. Electronic drives control torque and current during starting. They perform a function similar to a reduced voltage motor starter, but they do it steplessly, more efficiently, with more complete control of applied torque. They provide more torque per ampere of current than any other starting method. This is very beneficial for the frequent starting and stopping often required for cranes. Electromechanical motor controls for cranes require additional contactors, relays and other components to perform functions such as reversing, motor overload protection and braking. These functions are incorporated into the electronic controls with electronic drives. Electronic braking can return energy to the power supply and bring the load to nearly a complete stop before a friction brake is applied. For holding the load in position, an electromechanical brake is still required. Electronic drives can be used on bridge, trolley and hoist applications.
Q:Working as a crane driver in Dubai?
i am not a crane driver myself , but into this field of construction . get a licence as driver from authority just as a car driver. know how to drive the crane ad a driver know how to operate a crane as a operator. know the performance of the crane and its limits. the salary can vary depending on the type of crane and its special features. but not in the high end grade for sure unless its a very specialised crane operation. u can ask any thing more .
Q:How do I get on the cranes on the Highrise map in MW2?
watch that video its the easiest way to learn it and not have someone explain through text and what the hell is that first guy saying??
Q:what type of writer was stephen crane?
Stephen Crane was a naturalist a lot like Jack London. His main themes were man vs. nature and man vs. himself in which nature is an abstract, omnipotent force that does not (and really cannot) care what becomes of the individual. In Crane's writings, man is often faced with strengths and weaknesses within himself when confronted by extremes of uncaring Nature (see the short story The Open Boat).
Q:anybody know anything about the Crane Fireball Hi 4E ignition?
I don't know how much this is gonna help, but on my Ironhead I use a 8-2100, set at 1degree BTDC, and rear at 2 BTDC and electric start in race mode. Now I have aggressive cams and I don't know how it's supposed to be for a stock single stick.
Q:Is a tower crane a fixed type crane? Still can walk? Thank you
It can also be called a fixed crane. But there are many kinds of fixed cranes.
Q:What are the requirements for jack up and plus section of jack up tower crane?
When lifting, a standard section is hoisted on the imported beam or introduced platform. Then open the pins or bolts connecting the standard section with the slewing support. Start the oil pump, so that the cage in the standard section of the outward sliding, until the release of a standard section position, and then imported beam or imported platform on the standard section into the connection. This completes a process.
Q:What are the parts of a tower crane? What are their main functions?
The structural elements include the followingMain arm: carrying weight, and making the trolley have walking track.Balance arm: put up lifting mechanism, electric box, counterweight, and make tower crane to achieve balance torque, reduce the standard section of the bending moment.Tower cap: connect the main arm with the balance arm by the tie bar, so as to reduce the bending moment of the standard section.
Q:The arm of a crane at a construction site is 17.0 m long, and it makes an angle of 13.5◦ with the horizantal.?
I don't know if this is a question you got out of a book, or something you are trying to apply on a jobsite, but I would hate to see you try and use this approach with expensive equipment and innocent lives in the balance. Learn to use the crane charts. They account for many factors, including the weight of the boom, the tipping moment, the strength of the ropes, the engine's power, and the structural integrity of the boom.

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