SC903-031-01 Pacific Scientific
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The Pacific Scientific SC903-031-01 is a servo drive from the SC900 Servo Drives series. It delivers a continuous output current of 7.5 Amps at 25°C convection and provides a peak output power of 4.5 kW at 240 VAC. The drive features both analog and incremental digital command interfaces and operates with a power stage efficiency of 96%.
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Product Description:
The SC903-031-01 is a servo amplifier manufactured by Pacific Scientific and offered in the SC900 Servo Drives series. It conditions three-phase 240 V input power and delivers regulated current to compatible brushless motors, providing speed and torque control in automated machinery such as feeders, indexers, and packaging axes. As part of an industrial motion loop, the unit converts drive commands into phase-synchronized power so the motor follows position or velocity profiles with digital accuracy.
Under natural convection at 25 °C, the drive supplies a continuous motor phase current of 7.5 A; this rating sets the thermal limit for continuous operation without external fans. With the same cooling method, its continuous mechanical output reaches 2.2 kW, indicating the constant shaft power that a coupled motor can deliver. For rapid acceleration events, the current regulator supports a peak current of 15.0 A. The DC bus and inverter transistors allow a short-term power burst of up to 4.5 kW. These overload margins permit fast indexing or tension recovery without exceeding the device protection thresholds. Power-stage efficiency reaches 96%, reducing enclosure heat buildup and the need for auxiliary thermal management hardware.
Interface flexibility is provided by a command input that accepts analog or incremental digital references, allowing either ±10 V velocity commands or step-and-direction position streams from a motion controller. The drive has no serial bus or fieldbus interface, and setup and monitoring are handled locally. The inverter supports motor windings with line-to-line inductance ranging from a minimum of 2.0 mH to a maximum of 2 H, ensuring stable current regulation across a broad range of magnetic designs. Keeping the motor inductance within this range helps prevent excessive current ripple or control-loop oscillation when the drive operates in high-bandwidth servo systems.
