SC725A-001-01 Pacific Scientific
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The Pacific Scientific SC725A-001-01 is a servo controller in the SC720 Command Controllers series, offering a continuous output current of 30 Amps, configurable up to 40 Amps, and a peak output current of 60 Amps. It operates at a bus voltage of 320 Vdc with a 240 Vac, 3-phase input and features a 1024 ppr encoder resolution and a 20 kHz PWM frequency. The controller weighs 40 pounds and supports output power of 9 kW continuous and 18 kW peak at 240 Vac 3-phase.
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Product Description:
The SC725A-001-01 is a servo controller produced by Pacific Scientific and positioned within the SC720 Command Controllers series. As a torque/velocity controller, it regulates motor current or shaft speed based on external commands, providing closed-loop drive control for automated machinery. By combining power conversion with real-time signal processing, it links motion axes to upper-level PLCs while the resolver interface maintains synchronization between commanded and actual rotor position.
Its power section is designed for a three-phase supply of 240 Vac, drawing 29 Arms at 6 kW to energize the internal DC link. Under continuous operation, the drive can deliver 30 A of line-to-load current, and that setting can be raised to 40 A when additional thermal margin is available. This provides continuous shaft power of 9 kW, while dynamic moves are supported by a peak current rating of 60 A. A pulse-width modulation carrier of 20 kHz minimizes audible noise and motor ripple, and the internal shunt dissipates 200 W continuously or up to 20 kW in short bursts during fast deceleration.
Resolver feedback is processed at 12-bit resolution, and an encoder emulator outputs 1024 ppr quadrature signals so legacy motion cards can read incremental feedback without extra hardware. This arrangement supports older host controls that expect incremental feedback instead of direct resolver signals, and its analog command structure suits existing control systems that use conventional velocity references. For speed loops, the drive accepts a ±10 V command, and offset drift is limited to 50 mV/°C to help maintain accuracy of ±22 arcmin over temperature. The DC bus operates at 320 Vdc, and the controller weighs 40 lbs for cabinet-mounted installations.
Frequently Asked Questions about SC725A-001-01:
Q: What is the configurable continuous output current available on the SC725A-001-01 controller?
A: The SC725A-001-01 provides a continuous output current of 30 A, which can be configured up to 40 A.
Q: What is the peak output current supported by the SC725A-001-01?
A: The peak output current for this controller is 60 A, supporting high-demand transient loads.
Q: What type of input bus power does the SC725A-001-01 require?
A: The SC725A-001-01 operates with a bus power requirement of 240 Vac in a 3-phase configuration.
Q: What is the encoder resolution of the SC725A-001-01?
A: This controller features an encoder resolution of 1024 pulses per revolution for precise motor feedback.
Q: What control type does the SC725A-001-01 command controller use?
A: The SC725A-001-01 employs a torque and velocity control type for servo applications.
