SC125-401-T4 Pacific Scientific
Wake Industrial LLC is not an authorized distributor of this product.
The Pacific Scientific SC125-401-T4 is a brushless servo controller from the SC100 Brushless Servo Controllers series. It operates with a nominal bus voltage of 320 VDC and an input voltage of 230 VAC, supporting input frequencies from 47 to 63 Hz. The controller features a Tachsyn Processor interface and provides efficiency greater than 95 percent.
Internal Product Review
The SC125-401-T4 is a Pacific Scientific brushless servo controller with 230 VAC input voltage and a 320 VDC nominal bus voltage. Tachsyn Processor interface support and a 4.0 V/Krpm tachometer gradient contribute to precise feedback processing and stable servo response. Efficiency above 95% makes this controller a strong choice for demanding motion-control systems.
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Product Description:
The SC125-401-T4 is a brushless servo controller manufactured by Pacific Scientific for the SC100 Brushless Servo Controllers series. The unit serves as a compact drive that converts single-phase line power into a controlled three-phase output for permanent-magnet servomotors in industrial automation. It sits between the plant’s AC mains and the motor, shaping current in real time so motion axes can track position and velocity commands issued by a PLC or motion card.
The controller accepts an input of 230 VAC (+10%, -15%) at line frequencies from 47–63 Hz. Internally, a rectifier and filter create a DC bus nominally rated at 320 VDC; this higher intermediate voltage improves torque response at peak demand. Power devices switch at 5 kHz, a compromise that limits motor acoustic noise while keeping transistor losses low. Overall conversion efficiency is greater than 95%, so only a small fraction of the incoming power is dissipated as heat. This efficiency eases enclosure cooling requirements and permits full-rated operation without derating under nominal conditions.
The operating temperature and feedback capabilities complement the controller’s electrical performance. Continuous performance is maintained from 0 °C to 50 °C, and the assembly can be stored from -55 °C to 70 °C. Command and feedback signals are processed through a Tachsyn Processor, allowing the drive to interpret resolver-based speed information without additional interface cards. For fine velocity regulation, the built-in tachometer channel interprets a gradient of 4.0 V/krpm, aligning analog feedback with the digital current loop. The controller’s rectifier converts incoming AC power to the intermediate DC bus, while its switching stage generates the variable three-phase motor output needed for controlled torque and speed. Resolver feedback supplies the motion information required to correct velocity deviations as the connected axis accelerates, decelerates, or responds to changing mechanical loads.
