Hitachi showed its variable frequency crane and hoist drives, namely the SJ700 and SJ200 Series. A Detroit Hoist and Crane Co. unit, fitted with Hitachi control equipment, was on the booth.
Hitachi outlined advantages of the SJ200 system, such as compact size, easy of installation, powerful function set and built-in PLC-type logic and timing functions.
The SJ700 is a large capacity, high torque drive with a powerful function set, offering advanced vector control technology, providing high starting torque or 200% or more at 0.3Hz.
The unit also provides closed-loop capability with optional encoder feedback board, sophisticated external brake control and, like the 200 Series, advanced trip avoidance functions.
Both series are empowered for crane and hoist service by means of a unique Hitachi pendant interface board. Inverters feature easy programming via the removable standard keypad, or using the advanced PC-based ProDrive software.
