SC903-027-01 Pacific Scientific
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The Pacific Scientific SC903-027-01 is part of the SC900 Servo Drives series and features analog or incremental digital command interfaces. It has a continuous output current of 7.5 Amps at 25°C convection and delivers a peak output power of 4.5 kW at 240 VAC. The drive offers a power stage efficiency of 96% and supports a minimum motor inductance of 2.0 mH.
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Product Description:
The SC903-027-01 is a digital servo drive built by Pacific Scientific as part of the SC900 Servo Drives series. Designed to regulate permanent-magnet or induction servomotors in automated machinery, the unit converts three-phase mains energy into controlled current and voltage profiles that regulate motor torque and speed. It supports position or velocity loops controlled by external motion controllers, providing a compact power stage for general industrial automation. The drive can be used in machinery that requires responsive motor control without an integrated motion controller.
At 25 °C with natural convection, the drive delivers a continuous output current of 7.5 A, which can sustain rated torque on compatible medium-frame servomotors without forced cooling. When supplied by a 240 V three-phase source, it can provide up to 2.2 kW of continuous mechanical power. During acceleration or sudden load changes, the output current can rise to a peak of 15.0 A, providing short-term torque for demanding motion profiles while remaining within the drive’s current limits. Instantaneous power can reach 4.5 kW for brief intervals under the same input conditions. The power stage operates at an efficiency of 96%, so a relatively small portion of the input energy is converted into heat. Natural convection must remain unobstructed so that the drive can maintain its stated continuous output at the specified ambient temperature.
Motor selection must account for the supported phase-to-phase inductance range, which extends from 2.0 mH to 2 H. This range permits connection to low-inductance slotless motors as well as higher-inductance iron-core designs, provided all other electrical requirements are compatible. Command signals are accepted through an analog or incremental digital interface, allowing velocity or torque references to be supplied as ±10 V analog signals or as step-and-direction pulse trains. The drive does not include a fieldbus transceiver, and adjustments are made through front-panel potentiometers and test points. External motion controls can therefore provide command signals directly through the available interfaces while the drive regulates current to the connected motor.
