New models are available with a unique remote control system, which, according to Stahl, makes the use of the cranes safer and more efficient. Two receivers are placed on the bridge and the hoist but there is no festoon on the bridge.
Stahl marketing manager Otmar Buhmann told Hoist: “We are the only company currently offering this kind of concept. We approached HBC about designing this system and customers have shown great interest despite the extra expense.”
Wireless signal transmission to the crane replaces cable-bound control pendants. Stahl said that operating the crane from a distance permits safe and speedy handling of heavy loads.
Stahl customers can now choose between three radio transmitters. Depending on the application, the cubix compact transmitter, the micro pushbutton device or the spectrum joystick can be selected. The idea is that an individual and ergonomic transmitter is available for every customer requirement.
The cubix transmitter, a new device weighing only 230g, is lighter than other pushbutton transmitters. Stahl added: “It is convenient to carry and can be operated safely with just one hand.”
Previously, a cable harness of 160m of cables was necessary for a crane with 20m span. Stahl now instals a four-pole conductor line instead and transmits the control signals via radio. The cable harness of a crane with 20m span can, according to Stahl, thus be reduced by 80%. Moreover, instead of 160m, only about 32m are installed. These are fixed and not mobile.
The benefit for the user is the simplified maintenance. For example, wear-prone cables and cable trolleys are dispensed with. The plug and socket connections for the complete electrical equipment supplied as standard offer further simplification in maintenance and inspection.
Stahl said the operating speeds are designed to suit customers’ requirements. Two-speed drives or frequency-controlled variants are available for cross and long travel. Frequency inverters on the basis of Danfoss technology in the form of the innovative SFD1 are available with high-performance devices mounted directly on the travel drive and in IP 55 protection.
The hoist motors of the SH wire rope hoists are available with two speeds at a ratio of 6:1. They are classified in mechanism group 4m to FEM and with their oversized duty cycle (DC) and switching operations (S7H) they offer decisive advantages as to their service life.
