Case Study for modernisation of eRTG-cranes
27.11.2023
Old installations often cause problems that outweigh the solutions they offer. The case study of our partner Johannes Hübner Giessen demonstrates how a fault-prone encoder system with a multitude of individual components can be transformed into a safe and low-maintenance system solution.
Electrified rubber tired gantry cranes (eRTG cranes) move without a guide rail and can be used flexibly throughout the entire terminal area. Against this background, it is particularly important that the position, speed and revolutions are measured correctly and reliably to ensure that the crane functions safely. For one of our customers, an old encoder solution with a distribution gear and a multitude of individual measuring devices and components was frequently causing faults and also causing problems requiring complex repair work.
Johannes Hübner Giessen developed a reliable and simple complete solution with just one device. This solution reduces the risk of severe system defects such as fractured coupling and makes system maintenance much easier.
Hoist / Drum: U-ONE-Compact increases realiability and
reduces maintenance time in eRTG crane
- Reduced risk of coupling breakage
- Easy configuration
- Increased system reliability
- Increased safety
- Spare parts optimization
- Component reduction
Task
The customer had to use different devices to measure position, velocity and overspeed. This caused some problems:
- Indirect measurement of signals through different shafts
- Misalignment of shafts and couplings
- Excessive delay in troubleshooting faults for each component
- Time-consuming calibration process for the cam limit switches
- Various replacement parts that need to be kept in stock
Solution
The implemented solution provides a direct connection to the drum shaft. Due to this the risk of coupling breakage is reduced. The system solution U-ONE-Compact offers a quick and easy configuration which includes self-diagnostics for fault detection.
Furthermore it comes with a preset function, which is ideal for replacing hoist ropes. It is possible to copy the programming for cranes with the same movement. Utilization of the same copper cabling for connection to the PLC is possible. Summarized, the reliability and safety was increased
Used products
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U-ONE Generation II (Compact-System) | UOC 40 / USC 42
The U-ONE(-SAFETY)-Compact universal encoder systems for speed and position monitoring increase performance by making optimum use of permissible speed ranges and positioning quickly and precisely.
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Double joint couplings
Corrosion proof HKD metal multiple disc couplings compensate a parallel misalignment up to ±0.5 mm and an axial misalignment up to ±1 mm as well as extending the service life of encoders in the process.
Flohr Industrietechnik GmbH - Im Unteren Tal 1 - D-79761 Waldshut-Tiengen - Phone: +49 (0)7751 / 8731-0 - info@flohr-industrietechnik.de