The DR20 is standardised with a long list of features and is used on double girder cranes with the EZDR hoist trolley. This trolley is dimensionally optimised to meet the market requirements for these cranes.
Used in a wide variety of industries, the DR20 features duty classifications ranging from FEM 1 Am to FEM 4m, capacities from 6.3 to 50 US tons, and hoist speeds in a range of 12 FPM to 64 FPM.
The DR20 features quiet running, two-speed hoist motors, engineered for high cycling rates and accurate positioning, or VFC controls for higher speeds combined with “partial load express speed” for optimum efficiency.”Computer controlled, low current switching circuitry significantly extends contactor life,” Demag says. “A microprocessor provides real-time diagnostics as well as service and maintenance information covering hoist and crane functions,” it adds.
This information can be accessed via control pendant or radio transmitter mounted LCD screens. Communication with the crane is achieved with either a laptop or Pocket PC (PDA), with pre-loaded software from Demag, via infrared, without leaving the floor.
Operational safety is enhanced with standard hoist overload protection, upper and lower geared limit switches, brake wear monitoring and load spectrum recording. Additional standard features include a fast acting hoist brake, protective rope guide, lubricated for life gear reducer and state-of-the-art electrical equipment. Hard-wired push button pendants or optional radio controls are available.
