SC725A-001-PM72003 Pacific Scientific
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The Pacific Scientific SC725A-001-PM72003 is a servo controller from the SC720 Command Controllers series, supporting a bus voltage of 320 Vdc and bus power of 240 Vac on 3 phase. It has a continuous output current of 30 Amps, configurable up to 40 Amps, and a continuous rated torque of 38 lb-in. Its encoder resolution is 1024 pulses per revolution, and it weighs 40 pounds.
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Product Description:
The SC725A-001-PM72003 is a servo controller built by Pacific Scientific within the SC720 Command Controllers series. As a torque and velocity controller, it conditions three-phase AC power and regulates current to a brushless servo motor so that precise speed or torque loops can be closed inside the drive rather than the PLC. By housing the power stage, resolver interface, and shunt regulator in one enclosure, the unit simplifies axis integration for packaging machines, conveyors, and other motion systems. This arrangement also reduces the amount of external interconnect wiring needed between the feedback circuit and the power section.
Incoming power is 240 VAC three-phase, and the drive rectifies it to 320 VDC for the internal DC link. Under steady load, the bus draws 29 A RMS, so upstream wiring and protection devices must support that continuous demand. The amplifier can deliver a continuous motor phase current of 30 A, and a parameter can raise this limit to 40 A when additional cooling is available. For short accelerations or rapid decelerations, it supplies 60 A peak to help the motor hold speed during high-inertia moves. Thermal capacity supports 9 kW of continuous shaft power at this current level, while an external braking resistor dissipates surplus energy through the built-in shunt regulator. Because the controller combines rectification and current regulation internally, the motor receives a tightly managed output even when the supply varies under load.
Position accuracy is held to ±22 arcmin, a tolerance set by the resolver interface, the 12-bit converter, and an internal emulator that reproduces 1024 PPR quadrature signals for the motion controller. The analog velocity command accepts ±10 V, which allows direct connection to many legacy PLC outputs without requiring networked motion commands. With 150 lb-in of peak torque available, the drive can handle intermittent overloads, while 38 lb-in is available continuously up to the 6,000 rpm mechanical limit. The shunt circuit absorbs 200 W continuously and up to 20 kW momentarily, which helps prevent DC-link overvoltage during deceleration. Total mass is 40 lb, so the mounting surface and hardware must support the installed weight. Resolver-based feedback also avoids dependence on serial encoder protocols, which is useful in retrofit systems that already use analog command structures.
Frequently Asked Questions about SC725A-001-PM72003:
Q: What is the required bus power supply for the SC725A-001-PM72003?
A: The SC725A-001-PM72003 controller operates on 240 Vac, 3-phase input power.
Q: What is the configurable continuous output current for the SC725A-001-PM72003?
A: This controller provides a continuous output current of 30 A, which can be configured up to 40 A.
Q: What encoder resolution does the SC725A-001-PM72003 feature?
A: The encoder on the SC725A-001-PM72003 offers a resolution of 1024 pulses per revolution.
Q: What is the peak output power rating of the SC725A-001-PM72003 controller?
A: This model supports a peak output power of 18 kW when supplied with 240 Vac, 3-phase.
Q: What type of velocity input command signal does the SC725A-001-PM72003 accept?
A: The velocity input command for this controller accepts ±10 V signals.
