SC726A-001-PM72004 Pacific Scientific
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The Pacific Scientific SC726A-001-PM72004 is a servo controller in the SC720 Command Controllers series and weighs 90 pounds. It features a continuous output current of 60 Amps and a peak output current of 120 Amps, with a continuous rated torque of 5.0 Nm and a peak rated torque of 30.2 Nm. This model operates with a 240 Vac, 3 phase bus power and offers an encoder resolution of 1024 pulses per revolution.
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Product Description:
The SC726A-001-PM72004 belongs to the SC720 Command Controllers series produced by Pacific Scientific. As a torque and velocity controller, it forms the core interface between a servo motor and the plant-level control system, converting analog or digital commands into regulated current and voltage for the matched motor. Within industrial automation cells, it governs closed-loop speed and torque so that material-handling axes, winding stations, or high-speed spindles follow programmed profiles with a positional accuracy of ±22 arcmin supplied by its resolver-based feedback chain.
Power reaches the controller through a three-phase 240 Vac bus that is internally rectified to 320 Vdc. Under normal operation, it draws up to 38 Arms at 12 kW. The power stage can deliver a continuous phase current of 60 A, scaling to a transient ceiling of 120 A for acceleration or load disturbances. These currents align with the matched motor's 0.8 mH inductance so current loops remain stable over the full bandwidth. Closed-loop velocity is trimmed by a ±10 V command input, and the drive can sustain the motor's mechanical output at a rated shaft speed of 6000 rpm without derating. Diagnostic data, including a 3-bit open-collector fault code, may be fed directly into a PLC for coordinated shutdown or recovery.
Position feedback is reconstructed by an encoder emulator that issues 1024 ppr signals, giving upstream controllers incremental position data while the internal 12-bit RDC maintains absolute rotor angle. When maintained at the continuous torque of 5.0 Nm, the motor-drive pair satisfies most steady-state loads, while peak events are covered by a momentary capacity of 30.2 Nm. Continuous mechanical output is rated at 18 kW and can double to 36 kW for brief cycles, correlating with the earlier current values while avoiding thermal runaway through integral heat sinking. Installation demands account for the unit's 90 lbs mass, so cabinet shelves or backplates must be sized for that static load while still allowing convection airflow around the heat sink.
Frequently Asked Questions about SC726A-001-PM72004:
Q: What is the peak output current specification for the SC726A-001-PM72004 controller?
A: The SC726A-001-PM72004 offers a peak output current of 120 A for demanding applications.
Q: What type of bus power is required for the SC726A-001-PM72004 controller?
A: This model operates using a bus power supply of 240 Vac, 3 phase, suitable for industrial environments.
Q: What is the encoder resolution of the SC726A-001-PM72004 command controller?
A: The encoder resolution for this controller is 1024 pulses per revolution.
Q: How much continuous output power does the SC726A-001-PM72004 command controller deliver?
A: The SC726A-001-PM72004 is rated to provide continuous output power of 18 kW when used with a 240 Vac 3-phase supply.
Q: What control type does the SC726A-001-PM72004 command controller use?
A: This controller utilizes a torque/velocity control type for precise motion control.
