SC724A-035 Pacific Scientific
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The Pacific Scientific SC724A-035 servo controller is part of the SC720 Command Controllers series and weighs 40 pounds. It features a continuous output current of 15 Amps with a peak output current of 30 Amps, and supports continuous output power of 4.5 kW at 240 Vac three-phase input. The unit uses a brushless resolver feedback type and provides encoder emulation with a resolution of 1024 pulses per revolution.
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Product Description:
The SC724A-035 is a torque/velocity servo controller produced by Pacific Scientific within the SC720 Command Controllers series. As a closed-loop drive interface, the controller conditions three-phase power and resolver feedback to command permanent-magnet servomotors used in material handling, packaging, and coordinated motion cells. By regulating motor torque and speed in real time, it links high-level PLC commands to axis actuation and provides deterministic response for medium-power automation tasks.
The unit draws three-phase power at 18 A rms from 240 VAC lines, which are internally rectified to 320 VDC on the DC bus. Continuous operating limits allow 15 A of output current and 4.5 kW of shaft power to the motor. During rapid acceleration, it can supply up to 30 A for short intervals. Position information is acquired through a brushless resolver with 12-bit RDC resolution, while an encoder emulator outputs 1024 ppr pulses for external control equipment. A ±10 V velocity command, scaled by a 0.16 V/A current monitor, lets an external motion controller supervise torque. Static pointing precision is ±22 arc-minutes, which suits medium-accuracy mechanical stages.
Energy not returned to the line is absorbed by an internal shunt regulator rated for 200 W of continuous dissipation and up to 20 kW during transients, which helps prevent DC-bus overvoltage when a rapidly decelerating load feeds energy back into the controller. The PWM stage switches at 20 kHz, which helps keep motor audible noise low while maintaining current-loop bandwidth. Peak mechanical output reaches 9 kW, enabling short bursts of high torque without exceeding thermal limits. Velocity drift is limited to 50 mV/°C, so speed setpoints remain stable across cabinet temperature swings. The controller weighs 40 lbs, which supports panel-mount installation.
Frequently Asked Questions about SC724A-035:
Q: What type of feedback does the SC724A-035 controller support?
A: The SC724A-035 controller uses a brushless resolver for feedback, supporting precise position detection.
Q: What is the continuous output current rating for the SC724A-035?
A: This model has a continuous output current capability of 15 A.
Q: What is the encoder resolution provided by the SC724A-035 controller?
A: The SC724A-035 offers an encoder emulation resolution of 1024 pulses per revolution.
Q: What control modes are available on the SC724A-035 controller?
A: The SC724A-035 features a control type designed for both torque and velocity applications.
Q: What is the continuous output power of the SC724A-035 at 240 Vac 3-phase?
A: At 240 Vac 3-phase, the SC724A-035 achieves a continuous output power of 4.5 kW.
