Product Description:

Pacific Scientific manufactures the SC90200101NNN servo drive as part of its SC900 Servo Drives series. The module is installed between a three-phase supply and a brushless servomotor, translating low-level motion commands into high-energy, pulse-width-modulated phases that create precise torque, speed, or position in automated machinery. By integrating the power electronics and current regulation needed for closed-loop motion, it removes the need for discrete amplifier cards and provides a dedicated axis interface for pick-and-place heads, web feeds, and general discrete-part handling equipment.

At the control level, the drive accepts analog or incremental digital references, allowing a ±10 V command voltage or a step-and-direction pulse train from a motion controller to set the operating point. With ambient temperature held at 25 °C and only convection cooling, it can supply 3.75 A of continuous output current, which supports a sustained mechanical output of 1.1 kW from a motor connected to a 240 V three-phase bus. When rapid acceleration is required, the current loop permits 7.5 A peak for short durations, raising the instantaneous mechanical capability to 2.2 kW before thermal limits intervene.

Compatible motors must fall within a phase-to-phase inductance span capped at 4 H on the high side and not lower than 4.0 mH, a constraint that helps maintain current loop stability and prevent regeneration spikes during peak events. The power stage operates with a conversion efficiency of 95%, so cabinet heat rise is minimal relative to the electrical energy delivered to the load. Because the drive has no communications interface, all parameter adjustments, tuning actions, and diagnostics are performed through the same analog or incremental lines that furnish the primary motion commands.