SC722A001 Pacific Scientific
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The Pacific Scientific SC722A001 is a servo controller from the SC720 Command Controllers series. It features a continuous output current of 3.8 Amps and a peak output current of 7.5 Amps, with a bus voltage of 160 Vdc at 120 Vac input and 320 Vdc at 240 Vac input. The controller supports an encoder resolution of 1024 ppr, a PWM frequency of 20 kHz, and weighs 13 pounds.
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Product Description:
Pacific Scientific builds the SC722A001 in the SC720 Command Controllers series. It is classified as a servo controller and is intended to drive brushless servomotors in closed-loop automation where both torque and velocity must be regulated. The hardware provides torque and velocity control modes through internal analog and digital loops, which helps the unit respond to command changes and load variation during operation. It also includes a resolver-based encoder emulator so motors without optical encoders can still deliver quadrature feedback to the connected control system. Typical installation altitude may reach 5000 ft without derating.
The controller’s DC bus is energized to 320 Vdc from a 240 Vac three-phase supply, while a 120 Vac input produces a parallel 160 Vdc level for lower-power lines. Constant output capability is 1.1 kW with a continuous phase current of 3.8 A. During accelerations, the drive supplies 7.5 A peak and up to 2.2 kW of mechanical power, allowing short bursts of higher demand without continuous overload. The RMS bus current is limited to 4.5 Arms, and a 0.63 V/A current-monitor scale is available for external diagnostics. Pulse-width modulation occurs at 20 kHz, which helps keep motor acoustic noise above the audible range while supporting smooth current regulation. Resolver-to-digital conversion is processed at 12-bit resolution.
A three-bit fault-code output simplifies drive status monitoring by a PLC and gives external controls a direct way to read operating faults. Energy returned during overhauling loads is absorbed by a shunt network rated 20 W continuous and able to dissipate 3 kW in short bursts, helping control regenerated energy during deceleration. Position feedback can also be conveyed as an emulated encoder stream at 1024 ppr for motion controllers that require incremental signals instead of direct resolver input. The chassis weighs 13 lbs, which reduces panel load and keeps the controller manageable in cabinet installations. Overall accuracy is ±22 arcmin, supporting precise servomotor control in packaging, material handling, and electronics assembly systems.
Frequently Asked Questions about SC722A001:
Q: What is the encoder resolution of the SC722A001 controller?
A: The SC722A001 provides an encoder resolution of 1024 pulses per revolution for precise motion feedback.
Q: What is the continuous output current rating for the SC722A001?
A: This controller is designed to deliver a continuous output current of 3.8 A.
Q: What PWM frequency does the SC722A001 controller use?
A: The SC722A001 operates with a PWM frequency of 20 kHz for high-speed control.
Q: What is the peak output current of the SC722A001 controller?
A: This controller supports a peak output current of 7.5 A.
Q: What is the specified accuracy for the SC722A001 command controller?
A: The SC722A001 achieves an accuracy of ±22 arcminutes in its control applications.
