Product Description:

The SC904-021-01 servo drive is produced by Pacific Scientific within the SC900 Servo Drives series. It conditions three-phase mains power and delivers controlled current to brushless servo motors, allowing coordinated motion axes in machine tools, pick-and-place gantries, and similar equipment to follow velocity or torque commands from a PLC or motion controller. Its control format is suited to stand-alone motion applications where straightforward reference handling is preferred over network-based integration.

The drive accepts command references that are either analog or incremental digital, letting the control system use a continuous ±10 V profile or step-and-direction pulses. Under natural convection at 25 °C, it can supply a continuous phase current of 15.0 A, allowing the coupled motor to hold steady torque under normal thermal conditions. When powered from a 240 V three-phase source, the unit sustains 4.5 kW of continuous mechanical output, which suits mid-range servomotor duties in conveyors or feeders. It can pair with motor windings whose line-to-line inductance is as high as 1 H, helping maintain stable current regulation without excessive PWM ripple. Overall power-stage efficiency reaches 97%, so only a small share of the input energy is released as heat inside the cabinet.

The drive has no fieldbus interface, so setup and status monitoring rely on local analog signals or incremental digital feedback. Motor selections must provide at least 1.0 mH of inductance so that the current loop remains within the controller’s intended operating range. For dynamic maneuvers such as indexing or rapid stops, the amplifier can deliver a peak phase current of 30.0 A, which supports short-duration overload demand. Peak mechanical output reaches 9.0 kW, giving additional power for acceleration events. This arrangement fits applications that use direct reference wiring instead of networked communication.