Product Description:

The SC725A-001-PM72012 servo controller is produced by Pacific Scientific within the SC720 Command Controllers series. Classified as a servo controller, it executes torque and velocity loops for brushless axes and is configured through its analog personality type. In an automation cell, it receives position commands from the host control, interprets resolver signals, and issues current references that drive the connected power module.

Electrical capacity starts with a DC bus nominal of 320 Vdc, supplied from a 240 VAC three-phase rectifier. Under continuous duty, the bus supports 29 Arms at 6 kW, allowing the amplifier stage to deliver a programmable continuous output of 30 A that can be extended to 40 A when higher stall torque is required. With that current limit, the unit provides 9 kW of shaft power in continuous operation and uses a carrier frequency of 20 kHz to keep current ripple low. Position sensing is matched to a resolver-based encoder emulator that reproduces 1024 ppr quadrature signals, so legacy motion controllers can read incremental feedback while the internal 12-bit RDC maintains high absolute resolution. A monitor port scales phase current at 0.08 V/A for non-intrusive oscilloscope measurement, and shunt hardware dissipates 200 W continuously to clamp regenerated energy on overhauling loads.

During short transients, the controller can source 60 A to the motor windings, delivering up to 18 kW of electrical power for rapid acceleration. Feedback accuracy remains within ±22 arcmin thanks to the resolver processor and 12-bit RDC. The unit is part of the 720 Series, and the analog interface accepts ±10 V command signals for torque or velocity mode changes. When overhauling loads force energy back into the bus, the shunt circuit dissipates 20 kW briefly, well above its 200 W continuous rating. The unit has a mass of 40 lbs, and installation must provide adequate airflow so the switching section stays within limits.