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Article | March 1, 2009
Hitachi America, Ltd.: High-performance AC drives
The SJ700 Series of inverters from the Industrial Systems Div. of Hitachi America Ltd. expands on the performance, capabilities, and functions of its predecessor, the SJ300.
Improved sensor-less Vector (SLV) control algorithm enables the SJ700 to develop more than 200% starting torque at 0.3 Hz. The SJ700 can develop 150% torque at 0 Hz, ideal for vertical lift applications, using Hitachi’s unique “0 Hz Domain” open-loop control mode. Hitachi has also greatly simplified the auto-tuning process, making commissioning trouble-free. EzSQ (Easy Sequence) built-in programming function is like having a PLC built into the inverter.
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