Advantages of TC7550 tower crane: 1. Elements from Simens and Schneider are adopted in electrical system, performance of which is stable and reliable. 2. Main ports of tower crane is welded with CO2 gas protected welding and full-auto submerged arc welding that makes the stability of the whole machine be improved considerably. 3. The whole machine runs stably with good adjustable performance. 4. When the tower crane is under free standing height, it includes 1 basic section (height 7645) and 11 mast sections (height 6000). 5. Mast section lengthXwidthXheight (LXWXH): 2450X2450X6000, material is H model steel. 6. Main stressed force material use H model steel. 7. Main low pressure electric parts use Schneider, frequency use Yaskama, PLC use Mitsubishi hoisting jib mast section