SC722A-001 Pacific Scientific
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The Pacific Scientific SC722A-001 servo controller is part of the SC720 Command Controllers series and weighs 13 pounds. It supports continuous output current of 3.8 Amps and a peak output current of 7.5 Amps, delivering up to 1.1 kW continuous output power at 240 Vac 3-phase. This torque and velocity controller features 1024 ppr encoder resolution and operates at a PWM frequency of 20 kHz.
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Product Description:
The SC722A-001 servo controller is manufactured by Pacific Scientific and belongs to the SC720 Command Controllers series. As a torque and velocity controller, it sits between a host motion processor and a brushless servo motor, generating modulated three-phase power while monitoring the motor’s instantaneous current. Within an automated cell, this module maintains commanded speed or torque so that indexers, feeders, and packaging axes can follow precise motion profiles with stable response during changing load conditions.
When supplied with 240 VAC three-phase power, the drive develops a bus current of 4.5 Arms while holding the DC link at 320 Vdc. Under these conditions, it supplies a continuous phase current of 3.8 A and up to 7.5 A for acceleration peaks. Its continuous mechanical output is rated at 1.1 kW, while short bursts reach 2.2 kW, and internal dissipation is limited to 45 W at full load. When powered from 120 VAC, the link rests at 160 Vdc and draws 500 mA of logic current. A shunt transistor removes 20 W of regenerated energy, and the PWM stage switches at 20 kHz to keep current ripple low. The command input presents 50 kΩ impedance, while the current monitor provides ±4.5 V full scale with a 0.63 V/A scale factor for external diagnostics.
Position feedback is based on a resolver whose converter produces an encoder image of 1024 ppr together with a 12 bit RDC word for digital control loops. The controller reproduces motor velocity within ±22 arcmin and includes an encoder emulator for legacy counters that require incremental-style feedback. A shunt network can absorb a momentary 3 kW of regenerated energy during emergency stops. Total mass is 13 lbs, allowing installation in compact panels without additional supports. This combination of resolver processing and encoder emulation supports both modern closed-loop control and older counter-based interfaces.
Frequently Asked Questions about SC722A-001:
Q: What type of control operation does the SC722A-001 provide?
A: The SC722A-001 is a torque/velocity controller from the Pacific Scientific SC720 Command Controllers series.
Q: What is the encoder resolution of the SC722A-001 controller?
A: This model features an encoder resolution of 1024 pulses per revolution, allowing for precise feedback in motion applications.
Q: What is the continuous output current rating for the SC722A-001?
A: The continuous output current for the SC722A-001 controller is 3.8 A, ensuring stable motor operation.
Q: What is the peak output power capability of the SC722A-001 on 240 Vac 3-phase supply?
A: At 240 Vac 3-phase, the SC722A-001 supports a peak output power of 2.2 kW for demanding motion tasks.
Q: What is the PWM frequency used by the SC722A-001 controller?
A: This controller operates with a pulse width modulation frequency of 20 kHz for efficient motor control.
