SC905-001-01

SC905-001-01 is manufactured by Pacific Scientific for the SC900 Servo Drives series and belongs to the SC900 Servo Drive product family. Its command interface accepts analog or incremental digital signals for drive control. It has no separate communications interface, so setup is performed through the analog or incremental digital interface. Position resolution is 24 bits per revolution for fine position control, while absolute accuracy is ±5.3 arc minutes. The encoder output provides 16,384 pulses per revolution for external position feedback.

The drive supplies 30 A continuous output current from zero to peak, including 30.0 A under forced-air cooling at 50ºC. Peak output current is 60 A from zero to peak, also rated as 60.0 A. Continuous output power is 9 kW, with the same 9.0 kW rating at 240 V three-phase input and 50ºC forced air. Peak output power is 18 kW, including 18.0 kW at 240 VAC. The nominal DC bus voltage is 320 VDC, and the power stage operates at 97% efficiency to limit conversion losses. Output ripple frequency is 20 kHz.

Supported line-to-line motor inductance ranges from a minimum of 0.5 mH to a maximum of 0.5 H; the separate minimum motor-inductance rating is also 0.5 mH. Regenerative operation has a 10% duty cycle, and the shunt regulator handles peaks up to 20 kW for dissipating returned energy. An integral 240 VAC cooling fan provides forced airflow. The user-accessible +5 V output supplies up to 200 mA for auxiliary circuitry. The unit measures 425 mm in height, 229 mm in width, and 269 mm in depth.