The single girder wall travelling crane EWL:
─ The crane is designed for all-round moving of loads within the operating range on a building wall.
─ The crane travels on two crane tracks that run laterally on building supports. The lower crane track consists of two rails, one of which runs horizontally and the other vertically.
─ The crane has a wire rope hoist or a chain hoist with an electric trolley.
─ The overhead travelling crane consists of a box girder which is welded torsion-free and fully automatic.
─ The crane is controlled using the radio remote control “ABURemote” or the pendant control “ABUCommander”. Both the radio remote control and the pendant control have two-stage buttons with which the crane can be controlled at low and high speed for travel or lifting.
─ The trolley and the mobile control are connected to the rest of the crane’s electrics via an energy chain as standard.. As a variation, the trolley and the mobile control can be connected to the rest of the crane’s electrics with a festoon cable system instead of an energy chain.
─ The crane is supplied with power via a conductor system. This is mounted parallel to the crane track. The conductor system is designed according to the conditions (thermal stress, length, voltage drop,…).
The single girder wall travelling crane with 2 trolleys:
─ The trolleys are labelled “Trolley I” and “Trolley II” on the wire rope hoist and on the pendant control.
The end carriages:
─ The single girder wall travelling crane has a total of 3 end carriages.
─ The end carriages are fully-automatic, welded box girders.
─ The end carriages are connected to the bracket using high-tensile bolts.
─ The vertical end carriage has safety buffers to provide a controlled buffer impact in the event of the end stop being reached.
─ The powered end carriage has either a derailing protection device or a clamping piece as an option.
The end carriages of the sizes 280, 350 and 420:
─ The end carriages of the sizes 280, 350 and 420 have a clamping piece on the powered wheel.
─ The end carriages of the sizes 280, 350 and 420 have a special rigidity aid on the inside, called a clamp brace, which transfers the stress from the main girder to the end carriages.
The crane travel drives:
─ The drives are designed as pole-variable rotary current motors with electromagnetic brakes and gear units.
─ The drives have a low and a high speed. The ratio of the two speeds is 1:4.
─ The drives have a modular construction of motor and gear unit to enable easy replacement.
─ The drives can be continuously adjusted in speed by the ABULiner frequency converter (optional).
─ The drives are connected to the motor protection switch in the crane panel.
─ The acceleration of the drives to high speed is switched on after a brief time delay. The drive is thereby prevented from running in a starting current for a longer period in inching mode (rapid switching back and forth). This would eventually damage the motor.
─ When braking from high to low speed, only two of the three phases of the drive are briefly switched to low speed. In doing so, the drive does not jerk to a halt but brakes softly. As a result, the load does not swing as greatly. This function controls the standard SU1 device.
─ When braking from high speed to a complete stop, for a short period prior to stopping the drive is switched to low speed. In doing so, the drive initially brakes dynamically. There is thus less wear on the brake lining and the lining does not need to be replaced so frequently. (Optional, control by the SU2 device)
─ The crane electrical system is stored in the crane panel on the end carriage.
─ The crane electrical system has the protection rating IP 55.
─ The crane electrical system is protected by regular fuse links in its main fuse.
─ The crane electrical system has mechanically interlocked directional contactors. This ensures that the drives cannot be connected to both directions of travel at the same time. This would cause a short circuit.
─ The crane electrical system is particularly service-friendly due to screwless terminals and wiring in cable ducts.
─ The crane electrical system is switched centrally through the main contactor. It is located in the crane panel. If the emergency stop button is pressed or if an emergency stop is triggered for other reasons, the main contactor switches off the power for all drives.
─ As a result of plug-in connections between all crane components, the crane electrical system is particularly maintenance-friendly.
The crane travel limit switches:
─ The crane travel limit switch is realised through a cross-type limit switch.
─ Crane travel limit switches are mainly used in the direction of the crane track end as motion restrictors.
─ The crane travel limit switches (option) can be designed with a braking and/or shut-down function.
─ The crane travel limit switches switch the crane to low speed with the braking function just before the end of the crane track. This prevents the crane from running into the end of the crane track at high speed and causing the load to swing.
─ The crane travel limit switches with the shut-down function (option) completely switch off the crane travel drive immediately before the end of the crane track. The shut-down function is particularly useful for certain safety switches.