Product Description:

The SC903NN-033-01 is a servo drive built by Pacific Scientific and belongs to the SC900 Servo Drives series. Acting as a power stage between a motion controller and a brushless servo motor, the unit modulates line voltage and current so that axis speed, position, or torque follows the commanded profile in automated machinery. It is intended for medium-power installations where convection cooling is acceptable and where existing control systems already use analog command signals or incremental feedback. This arrangement also suits retrofit applications that rely on straightforward hardwired control rather than network-based communication.

The drive accepts commands through an analog or incremental digital interface, so velocity or torque references can come directly from legacy motion controllers without protocol conversion. During steady operation at 25 °C with natural convection, it supplies up to 7.5 A of continuous output current, while short transients can reach 15.0 A to accelerate inertial loads. Because the cooling method is fanless convection cooling, enclosure airflow requirements stay minimal, and the power section maintains an efficiency of 96%. No fieldbus or serial link is included, so setup relies on the same command and feedback connections used by the surrounding control architecture.

Rated for a continuous output of 2.2 kW from a 240 V three-phase supply at a convection temperature of 25 °C, the drive fits mid-range servo motors used on indexers, packaging axes, and material-handling spindles. Peak demand can rise to 4.5 kW for brief intervals, provided the connected motor’s line-to-line inductance remains within the allowed span of 2 H down to 2.0 mH. Keeping the motor within that inductance range helps the current loop remain stable during overload events and supports consistent response when load conditions change. The unit is intended for applications that need compact servo control without forced-air cooling hardware.