SC724A-001-PM72007 Pacific Scientific
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The Pacific Scientific SC724A-001-PM72007 is a torque and velocity controller from the SC720 Command Controllers series, featuring 1024 ppr encoder resolution and 12-bit RDC resolution. Designed for 3-phase 240 Vac systems, it provides a continuous output current of 15 A with a peak output current of 30 A, and has a rated speed of 3000 rpm. The unit weighs 40 pounds and offers continuous rated torque of 58 lb-in with a peak torque of 125 lb-in.
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Product Description:
The SC724A-001-PM72007 is a servo controller produced by Pacific Scientific as part of the SC720 Command Controllers series. Designed for multi-axis industrial automation, the unit functions as a torque and velocity controller that exchanges commands with higher-level PLCs while driving brushless servomotors. It conditions a 240 VAC three-phase supply, builds a regulated DC bus, and supplies the feedback processing needed to hold motor position within ±22 arc-min during repetitive or coordinated motion tasks across linked axes. This arrangement allows the controller to respond quickly to changing load demands during indexing, tracking, and synchronized machine movement.
Electrical performance is centered on a bus link held at 320 Vdc. With a 240 VAC three-phase feed, the internal rectifier draws 18 Arms and supports 4.5 kW of continuous shaft power. The power stage delivers up to 15 A of continuous output current, while transient events can be handled by a 30 A peak rating. Position feedback is sampled through a resolver and an encoder emulator that presents a 1024 ppr signal, and the control board also reads a 12-bit RDC word for higher-resolution diagnostic work. The combination of resolver input and encoder emulation lets the controller support both motor feedback handling and downstream motion signaling. Under these conditions, the drive maintains commanded velocity up to the rated 3000 rpm of the companion motor, and its torque and velocity algorithm supervises both operating modes without manual reconfiguration.
Mechanical coupling limits include 125 lb-in of peak torque and a continuous capability of 58 lb-in, which align with the thermal boundary of the heat sink and the allowable copper current noted above. For energy dissipation, the unit routes regenerative current into an internal shunt rated at 200 W continuously and 20 kW at peak, while the inverter can momentarily elevate shaft output to 9 kW during acceleration. This internal shunt helps absorb returned energy during deceleration and reduces overvoltage stress on the DC bus. The unit is housed in a 40 lb enclosure sized for the 720 Series, so cabinet layouts can account for its weight and airflow needs.
Frequently Asked Questions about SC724A-001-PM72007:
Q: What is the continuous output current rating of the SC724A-001-PM72007?
A: The SC724A-001-PM72007 controller can deliver a continuous output current of 15 A.
Q: What type of power supply does the SC724A-001-PM72007 require?
A: This model supports a bus power input of 240 Vac, 3-phase.
Q: What type of feedback emulation system is integrated into the SC724A-001-PM72007?
A: The feedback emulation is achieved with an encoder emulator using a resolver.
Q: What is the encoder resolution of the SC724A-001-PM72007 controller?
A: The controller's encoder resolution is specified at 1024 pulses per revolution.
Q: What is the continuous rated torque provided by the SC724A-001-PM72007?
A: This controller can achieve a continuous rated torque of 58 lb-in.
