SC723 Pacific Scientific
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The Pacific Scientific SC723 is part of the SC720 Command Controllers series and functions as a torque/velocity controller. It supports a continuous output current of 7.5 Amps and features a peak output current of 15 Amps, with continuous output power rated at 2.2 kW on 240 Vac 3-phase input. The SC723 weighs 16 pounds and delivers efficiency greater than 95% at 50% output.
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Product Description:
The SC723 is a servo controller manufactured by Pacific Scientific within the SC720 Command Controllers series. As a torque/velocity controller, it regulates motor speed or torque to match process demands in automated cells, packaging lines, and positioning stages. By converting three-phase AC input into a controlled DC bus and then modulating the motor phases, the unit provides closed-loop drive control for brushless servomotors and other rotary loads in industrial automation.
When powered from a 240 Vac three-phase supply, the internal bus draws 9 Arms, creating a DC link of 320 Vdc; with a 120 Vac source the bus stabilizes at 160 Vdc. The controller can deliver a continuous armature current of 7.5 A, and that corresponds to 2.2 kW of sustained mechanical output at the motor terminals. For rapid acceleration or shock loading, the drive supports a short-term limit of 4.5 kW. A continuous shunt path rated for 40 W dissipates regenerative energy when the load back-feeds the bus, while the built-in 0.32 V/A monitor scale factor provides a proportional voltage so real-time motor current can be observed with standard instrumentation. Power losses remain limited, with 77 W of heat produced at full load, helping cabinet temperatures stay within design margins.
During transient events the current can rise to 15 A without loss of control, and the shunt resistor can absorb peaks up to 6 kW. Conversion efficiency exceeds 95% at half load, reducing line-side energy use. The pulse-width modulated output switches at 20 kHz, placing switching noise above most audible ranges and minimizing torque ripple. An encoder emulator accepts resolver feedback so legacy motion boards see standard quadrature signals, and a ±10 V velocity command input interfaces with common PLC analog modules. A velocity offset drift of 50 mV/°C indicates zero-speed stability over temperature. Total mass is 16 lbs, allowing panel mounting without heavy structural reinforcement.
Frequently Asked Questions about SC723:
Q: What is the continuous output power of the SC723 controller?
A: The SC723 controller delivers a continuous output power of 2.2 kW at 240 Vac, 3-phase input.
Q: What control type does the SC723 provide?
A: SC723 operates as a torque and velocity controller, providing precise speed and torque management for servo applications.
Q: What is the peak output current rating for the SC723?
A: This controller supplies a peak output current of 15 A, allowing for short bursts of high current demands.
Q: What velocity command input range does the SC723 accept?
A: The SC723 supports a velocity command input of ±10 V, enabling it to process standard control signals from automation systems.
Q: What type of feedback emulation does the SC723 utilize?
A: The SC723 uses an encoder emulator based on resolver feedback for position and speed feedback emulation.
