SC103 Pacific Scientific
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The SC103 is a brushless servo controller produced by Pacific Scientific as part of the SC100 Brushless Servo Controllers series. It features a nominal bus voltage of 320 VDC and operates with a continuous output current of 15 A, delivering a continuous output power of 4.5 kW. The controller supports a 230 VAC three-phase input and reaches greater than 95 percent efficiency.
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Product Description:
The SC103 is a brushless servo controller produced by Pacific Scientific within the SC100 Brushless Servo Controllers series. It regulates current and velocity loops for permanent-magnet servomotors used on packaging lines, pick-and-place gantries, and other industrial positioning axes. By converting a three-phase AC supply into a controlled DC bus and pulse-width-modulated output, the unit supplies closed-loop torque commands that keep motor motion synchronized with the host automation system. Its control method supports repeatable starts, stops, and speed changes during indexed motion. That makes it suitable for applications where axis response must stay consistent from cycle to cycle even when loads change during production.
In continuous duty, the controller develops a nominal bus of 320 VDC from a three-phase 230 VAC (+10%, -15%) source at 47–63 Hz. This internal bus gives the power stage a stable source for regulated motor current during sustained operation. With that bus, it can sustain 15 A of stall current and deliver 4.5 kW of mechanical power to the motor while drawing less than 105 W of internal dissipation at full load. The conversion efficiency is > 95%, and a 5 kHz switching frequency helps keep ripple low without excessive switching losses. Lower conversion losses also help reduce heat buildup inside the controller during extended operation. A built-in shunt regulator removes regenerated energy and handles 30 W continuously so braking events do not raise the DC link voltage beyond safe limits.
For dynamic moves, the output stage can supply up to 30 A for five seconds, corresponding to a peak mechanical power of 9 kW. The shunt circuit also scales to absorb 8 kW for 300 ms, which helps protect the bus during rapid deceleration. Full output ratings are maintained across an ambient range of 0 °C to 50 °C. When the machine is idle, the controller tolerates storage temperatures between -55 °C to 70 °C without degradation. This operating window fits installations that alternate between active production and longer shutdown periods.
Frequently Asked Questions about SC103:
Q: What input voltage does the Pacific Scientific SC103 support?
A: The SC103 servo controller operates with a nominal input voltage of 230 VAC, accommodating a range of +10% to -15%.
Q: What is the continuous output current rating of the SC103 controller?
A: This model supplies a continuous output current of 15 A at stall.
Q: What is the peak output power capability of the SC103 controller?
A: The SC103 delivers a peak output power of 9 kW for up to 5 seconds.
Q: Within what temperature range does the SC103 operate at full performance?
A: The controller maintains full ratings in temperatures from 0°C to 50°C.
Q: What is the switching frequency of the Pacific Scientific SC103 controller?
A: The switching frequency of the SC103 is set at 5 kHz.
