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Article | May 4, 2011
Hitachi America, Ltd.: Advanced industrial AC variable frequency drives
Hitachi’s L700 Series of Industrial AC Variable Frequency Drives for fans, pumps, conveyors and more incorporates the improved sensorless vector (SLV) control algorithm that was first developed for their SJ700 series.
This allows the L700 to develop 150% torque at 0.5 Hz. The L700 also has a number of features built in that make the commissioning process quick and trouble-free. The company’s EzSQ (Easy Sequence) built-in programming function actually provides the functionality of a PLC built into the inverter. The program is developed on a PC and then downloaded to the inverter, using the simple-to-use EzSQ software provided at no charge. The L700 also features the patented micro-surge voltage suppression (to protect the motor winding insulation), advanced trip avoidance functions, configurable sink/source logic on digital inputs, built-in dynamic braking circuit in models up to 30 hp (22 kW), a built-in EMC filter in models up to 200 hp (160 kW), and much more.
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