SECTOR SPOTLIGHT Ӏ ELECTRIC CRANES
The 99 kWh battery is securely installed in a box weighing around 1.5 tonnes at the rear of the crane. To enable driving on public roads, the ballast plates have been adapted accordingly. On- and off-road a 400kW
(544hp) combustion engine with exhaust emission Stage 5 provides the drive.
The motor is fully compatible
with hydrogenated vegetable oil (HVO) and, compared to diesel fuel, reduces operational CO2 emissions by up to 90 percent. In crane operation users
have a choice between using the combustion engine or electric motor. The latter reduces both air and noise emissions and is suitable for zero emissions areas and noise- sensitive areas, says Liebherr. The 111kW electric motor for
lifting offers virtually the same performance as the six-cylinder combustion engine as found on its sister model, the diesel LTM 1150-5.4. For the transfer of power
to the consumers in the crane superstructure the electric drive uses the existing gear shafts from the transfer gearbox in the chassis
to the pump transfer gearbox in the superstructure. The electric motor's distributor gear is integrated between the chassis transfer gearbox and the gear shafts to the superstructure. This facilitates ease of switching between diesel and electric power, says Liebherr.
TWICE AS NICE Manitowoc also used Bauma to launch its ever plug-in hybrid technology all terrain cranes: the 150-tonne capacity Grove GMK5150L-1e and GMK5150XLe. The cranes incorporate much of the technology that was shown in concept form at Bauma 2022 in the GMK4100L-2 hybrid. The cranes’ battery pack
provides around 180kWh of energy enabling them to provide around five hours work as a taxi crane. The battery can be charged either from the grid (by AC or DC power supplies) or via a 170kW generator integrated into the carrier. Charging whilst driving or using the crane is possible driving. When the crane is connected to the grid crane operation can be extended to approximately 20 hours without
compromising speed or capacity. “We certainly believe we have
the best overall hybrid crane solution,” says Florian Peters, senior product manager for all terrain cranes at Manitowoc. “We say this because we offer the flexibility to charge the battery pack either from the grid (with either AC or DC supplies) or through the built-in generator, removing any concerns customers have about charging infrastructure. “So if there is no charging
infrastructure at the customer’s depot or on the jobsite, the journey to and from the project can still be used to recharge the 180kWh battery pack. “The battery pack can accommodate a full working day without any compromise in performance. Even if the crane handles several jobs a day, recharging is unlikely to be required at the jobsite. And if grid charging is available at the jobsite, the crane can operate while being charged. “When connected to a DC fast
Grove's
GMK5150XLe at Bauma
charger it takes around an hour to reach a full state of charge. If the internal generator is being used for charging it also takes around an hour to get to 100 percent charge. We should also note that the crane’s diesel engine can also be run on HVO fuel, which offers CO2 emissions reductions of up to 90 percent compared with traditional diesel fuels. “When connected to 400V/32A
power supply, the battery pack can charge overnight and be at 100% by the next morning. The crane can also work while charging with no impact on performance. With a full battery pack and if connected to the grid with a 32A supply, the crane can work for around 20 hours emissions-free. This kind of performance ensures the crane can handle all tasks in a day on even the most demanding jobsites.”
CRANES TODAY 33
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