SC725A-001 Pacific Scientific
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The Pacific Scientific SC725A-001 is a servo controller in the SC720 Command Controllers series and weighs 40 pounds. It provides continuous output current of 30 Amps, configurable up to 40 Amps, and supports a bus voltage of 320 VDC with bus power input at 240 VAC three-phase. The controller offers an encoder resolution of 1024 ppr and utilizes a 20 kHz PWM frequency.
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Product Description:
Pacific Scientific’s SC725A-001 belongs to the SC720 Command Controllers series and is classified within the manufacturer’s servo controller product group. The unit is intended to drive brushless servomotors in industrial automation. It provides closed-loop torque or velocity control to position axes accurately and maintain commanded speeds during process changes.
The controller is powered from a 240 Vac 3-Phase mains connection that is internally rectified to the DC bus; under nominal 6 kW loading the bus draws 29 Arms. Continuous motor supply is rated at 30 A, and the firmware menu allows adjustment to 40 A for applications that require more thermal headroom. Fast torque transients are supported by a peak capability of 60 A and by an output stage that switches at 20 kHz, a frequency high enough to minimize audible noise while keeping current ripple low. Velocity commands are accepted as a ±10 V analog signal, and an internal scale of 0.08 V/A is provided for current monitoring at the drive terminals. For digital feedback, the unit reads a resolver and reproduces an encoder signal with 1024 ppr, simplifying upgrades in systems that expect incremental feedback. A 200 W shunt resistor dissipates regenerative energy continuously, with 20 kW available for short braking events.
Additional performance data include an accuracy window of ±22 arcmin when operating as a velocity source and a burst rating of 18 kW for rapid acceleration. The DC link steady value of 320 Vdc pairs with a 250 mA logic draw at the control terminals, keeping auxiliary consumption modest. Resolution for the resolver-to-digital converter is 12 bit, and the integrated shunt regulator protects against overvoltage on deceleration. All of these functions are packaged in a chassis that weighs 40 lbs, suitable for direct cabinet mounting without external heat sinks.
Frequently Asked Questions about SC725A-001:
Q: What type of power input is needed for the SC725A-001 controller?
A: The SC725A-001 servo controller requires a 240 Vac, 3-phase power input for operation.
Q: What is the continuous output current capability of the SC725A-001?
A: This controller provides a continuous output current of 30 A, which can be configured up to 40 A.
Q: What is the encoder resolution offered by the SC725A-001?
A: The SC725A-001 supports an encoder resolution of 1024 pulses per revolution.
Q: What is the PWM frequency of the SC725A-001 servo controller?
A: The SC725A-001 has a PWM frequency of 20 kHz for efficient motor control.
Q: What is the peak output power of the SC725A-001 controller?
A: With a peak output power of 18 kW at 240 Vac 3-phase, the controller can handle high-demand applications for short durations.
