Hitachi SJ700 inverter designed
for use in vertical lift applications
Jan 24, 2011 7:00 AM
Hitachi America Ltd, Industrial Components & Equipment Division, announces the new SJ700-2200HFU2 model inverter, with a 440-amp output capability. Designed for vertical lift applications, this new model fills in the gap at 300-350 horsepower in the SJ700 series, which now completely covers the range from ˝ to 600 hp.
The SJ700 expands on the performance, capabilities, and functions of its predecessor, the SJ300. An improved vector control algorithm and auto-tuning function enables the open-loop SJ700 (SLV) to develop more than 200% starting torque at 0.3 hertz. Using Hitachi’s “0 Hz Domain” open-loop control mode, the SJ700 can develop 150% torque near 0 Hz, ideal for vertical lifting. In closed-loop mode with encoder feedback, the SJ700 delivers more than 100% torque at 0 Hz.
Another new element in the SJ700 is Hitachi’s EzSQ (Easy Sequence) built-in programming function. It’s like having a programmable logic controller ( PLC) inside the inverter. In many cases, the need for a separate PLC can be eliminated. The user develops EzSQ programs on a PC, and then downloads them to the inverter using the configuration/programming software provided at no charge.
The SJ700 can deliver true servo-like position control when mated with a general-purpose induction motor and encoder, offering a low-cost motion control alternative. The SJ700, given a position command, speed command, and acceleration/deceleration times, can move the motor shaft from position A to position B following the defined profile and then maintain the shaft in “servo lock” status.
Hitachi has added other new features into the SJ700, such as patented micro-surge voltage suppression (to protect the motor winding insulation), advance trip avoidance functions, configurable sink/source logic on I/O, built-in dynamic braking circuit-in models up to 30 hp (22 kW), and built-in EMC filter up to 75 hp (55 kW).
Hitachi America Ltd, Industrial Components and Equipment Division supplies electrical and electronic components for application in pharmaceutical plants, food and beverage processing plants, and other manufacturing facilities. For more information, visit www.hitachi-america.us.
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