SC726A-001 Pacific Scientific
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The Pacific Scientific SC726A-001 is a servo controller from the SC720 Command Controllers series, capable of 60 Amps continuous output current and 120 Amps peak output current. It operates with a 320 Vdc bus voltage, provides 18 kW continuous and 36 kW peak output power at 240 Vac, three-phase, and weighs 90 pounds. This torque and velocity controller features a 1024 pulse encoder resolution and a 20 kHz PWM frequency.
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Product Description:
The SC726A-001 servo controller is produced by Pacific Scientific as part of the SC720 Command Controllers series. It serves as the command element in industrial automation cells, translating external torque or velocity references into regulated motor drive signals. Positioned between the facility’s power bus and brushless servomotors, the unit supervises current loops, manages regenerative energy, and delivers the motion consistency required by pick-and-place equipment, indexing tables, and coordinated conveyor sections. Its control role allows the connected axis to respond predictably during starts, stops, and changing mechanical loads, which is important in machines that depend on repeatable motion.
Line supply to the controller is a three-phase 240 Vac network, rectified internally to a regulated 320 Vdc bus that feeds the inverter bridge. During steady operation, the drive supplies 60 A of phase current and maintains 18 kW of continuous power output, while acceleration demands are satisfied with surges to 120 A and 36 kW. A dedicated shunt circuit dissipates 500 W of regenerated energy, while overall copper and semiconductor losses reach 600 W at full load. Carrier-based PWM limits current ripple without external filters, and continuous shunt service supports DC-bus stability during repeated deceleration events in multi-axis installations. This arrangement helps the controller maintain smooth motor current delivery during frequent speed changes.
The controller executes torque and velocity loops through a digital architecture, and commanded speed enters on a differential analog channel scaled at ±10 V. Feedback is accepted from a resolver whose encoder emulator outputs 1024 ppr signals, and the internal converter resolves position to 12-bit granularity while system accuracy is ±22 arcmin. A diagnostic port delivers 0.04 V per ampere for current monitoring, which allows external equipment to observe operating current during runtime. The switching bridge is clocked at 20 kHz, and excess regenerative energy can be absorbed at up to 40 kW by the peak shunt element. The internal series identifier places the controller in the 720 Series, and the assembly weighs 90 lbs, which helps with panel layout planning and support selection.
Frequently Asked Questions about SC726A-001:
Q: What is the continuous output current rating of the SC726A-001?
A: The SC726A-001 controller is capable of continuous output currents up to 60 A, enabling it to support demanding servo applications.
Q: What encoder resolution does the SC726A-001 provide?
A: The encoder resolution on the SC726A-001 is 1024 pulses per revolution (ppr), allowing for precise position and speed feedback.
Q: What is the continuous output power of the SC726A-001 at 240 Vac, 3-phase?
A: The SC726A-001 supports a continuous output power of 18 kW when operating at 240 Vac, 3-phase supply.
Q: What type of control does the SC726A-001 servo controller provide?
A: This model operates as a torque and velocity controller, making it suitable for various motion control applications.
Q: What is the PWM frequency of the SC726A-001 controller?
A: The SC726A-001 features a PWM switching frequency of 20 kHz, facilitating smooth and efficient servo operation.
