Machine Design

New Product: Large-Capacity Ac Drives

The SJ700 Series ac drives handle 250, 400, and 500-hp ranges. An improved Sensorless Vector control algorithm lets the drives develop 150% starting torque at 0.3 Hz.

For verticallift applications, the SJ700’s 0 Hz Domain open-loop control mode develops 130% torque at 0 Hz. Additional features include Micro Surge Voltage suppression (protects motor-winding insulation), advance trip-avoidance functions, configurable sink/ source logic on I/O, built-in RS-485 Modbus/RTU communication, and options for other communications networks. The SJ700 can be configured using a front-mounted keypad.

Hitachi America Ltd., Industrial Systems Div.,
50 Prospect Ave., Tarrytown, NY 10591,
(914) 631-0600,

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