SC725B00101 Pacific Scientific
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The Pacific Scientific SC725B00101 is a servo controller from the SC720 Command Controllers series. It provides a continuous output current of 30 amps, configurable to 40 amps, and supports a peak output current of 60 amps. The controller operates with a DC bus voltage of 320 VDC and delivers 9 kW continuous output power at 240 Vac three-phase with a peak output power of 18 kW.
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Product Description:
The SC725B00101 is a servo controller manufactured by Pacific Scientific and assigned to the SC720 Command Controllers series. It delivers torque or velocity regulation for brushless servomotors by closing the loop around resolver feedback and a digitally synthesized velocity command. Installed in a control cabinet, it serves as the motion control centerpiece in medium-power automation cells. The controller is suited for cabinet-based motion systems that need stable speed control during changing loads. Resolver processing and command handling are built into the unit, which helps keep the surrounding drive architecture compact.
The controller has a continuous output rating of 30 A and can be configured up to 40 A to match higher torque demands. The internal DC link is held at 320 VDC, and the three-phase 240 VAC power stage delivers 9 kW continuously and 18 kW of peak mechanical power to the motor. During rapid accelerations, the power section enters its peak zone, while the shared bus draws 29 Arms when the drive cluster reaches 6 kW regeneration. Pulse-width modulation is processed at 20 kHz to reduce motor acoustic noise, and the 200 W shunt dissipates steady excess energy during regeneration. Position feedback is digitized at 4096 PPR from the built-in emulator, supporting fine velocity-loop response.
Dynamic accuracy is maintained within ±4 arcmin through resolver tracking and a 14-bit RDC interface that resolves position for fine speed regulation. The drive accepts a differential velocity command of ±10 V and compensates thermal drift by 50 mV/°C so scaling remains stable across cabinet temperature changes. A current monitor port outputs 0.08 V per ampere, giving control systems real-time load data up to 60 A. During aggressive decelerations, the internal dissipation path can momentarily absorb 20 kW, preventing DC-link overvoltage until external braking hardware engages. Cabinet planning is aided by a shipping mass of 40 lbs, which helps with mounting and support calculations.
Frequently Asked Questions about SC725B00101:
Q: What is the continuous output current capacity of the SC725B00101 servo controller?
A: The SC725B00101 is capable of continuous output currents up to 30 A, and can be configured to handle up to 40 A if needed.
Q: What is the peak output current specification for the SC725B00101?
A: This controller supports a peak output current of 60 A for demanding applications requiring short bursts of high power.
Q: What control modes does the SC725B00101 from Pacific Scientific support?
A: The SC725B00101 operates as a torque or velocity controller, making it suitable for dynamic industrial motor control tasks.
Q: What is the encoder resolution for position feedback on the SC725B00101?
A: The encoder resolution provided by the SC725B00101 is 4096 pulses per revolution, allowing for precise motion control.
Q: How much continuous output power does the SC725B00101 deliver at 240 Vac three-phase?
A: Continuous output power for this unit is rated at 9 kW when supplied with 240 Vac three-phase power.
