SC726A-001-PM72009 Pacific Scientific
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The Pacific Scientific SC726A-001-PM72009 belongs to the SC720 Command Controllers series and weighs 90 pounds. This servo controller provides a continuous output current of 60 Amps and a peak output current of 120 Amps, with an output power of 18 kW continuous and 36 kW peak at 240 Vac, 3-phase. It features a torque or velocity control type with a PWM frequency of 20 kHz and a differential quadrature TTL encoder output.
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Product Description:
The SC726A-001-PM72009 is a servo controller built by Pacific Scientific for the SC720 Command Controllers series. Configured as a torque/velocity controller, it closes the current and speed loops needed for coordinated axes and can position loads with an accuracy of ±22 arcmin. A differential quadrature TTL encoder interface supports incremental feedback at 1024 ppr. An internal encoder emulator lets resolver-equipped motors appear as digital encoders to the drive system, which helps the controller work with different motor feedback arrangements. Diagnostic signaling is provided through a 3-bit open-collector fault output. At 90 lb, the controller occupies a mid-frame cabinet slot without excessive structural reinforcement.
Power for the unit is taken directly from a 240 Vac three-phase supply, and this input is rectified to a DC link that remains at 320 Vdc during normal operation. From that bus, the controller can deliver a continuous output of 60 A, translating to 18 kW of mechanical power when operating on 240 V mains. For rapid accelerations, the output stage allows up to 120 A peak, and a matching 36 kW burst rating supports large inertial loads. A current-monitor pin scales drive current at 0.04 V/A so external capture cards can log torque demand in real time.
Pulse-width modulation is generated at 20 kHz, a carrier frequency chosen to move switching noise above the audible band while minimizing IGBT losses. During deceleration events, excess bus energy is sent to the shunt, where the resistor can absorb 40 kW in short intervals to prevent overvoltage trips. Velocity commands are accepted as an analog span of ±10 V, giving motion controllers a predictable interface for speed control. The resolver-to-digital converter works at a resolution of 12-bit, providing stable angle data for the closed-loop speed and torque functions.
Frequently Asked Questions about SC726A-001-PM72009:
Q: What is the continuous output power rating for the SC726A-001-PM72009 controller?
A: The SC726A-001-PM72009 servo controller offers an output power of 18 kW continuously at 240 Vac 3-phase operation.
Q: What is the peak output current capacity of the SC726A-001-PM72009?
A: This model supports a peak output current of 120 A for high-demand applications.
Q: What type and resolution of encoder output does the SC726A-001-PM72009 provide?
A: The controller features differential quadrature TTL encoder output with a resolution of 1024 pulses per revolution.
Q: What is the accepted velocity input range for the SC726A-001-PM72009?
A: The velocity input accepts a range of ±10 V for precise speed adjustments.
Q: What is the control accuracy specification for the SC726A-001-PM72009 servo controller?
A: The SC726A-001-PM72009 maintains a control accuracy of ±22 arcminutes.
