Product Description:

The SC724A-001-PM72008 is a servo controller manufactured by Pacific Scientific and supplied within the SC720 Command Controllers series. As a torque and velocity controller, it closes the current loop for permanent-magnet servomotors and issues speed or torque commands to keep axis motion stable in automated machinery. The unit interprets host references, manages feedback from resolvers or encoders, and modulates three-phase power devices so that connected motors follow commanded profiles in packaging lines, textile machines, or general material-handling stations.

An analog reference window of ±10 V establishes the command span, while an internal rectifier boosts the 240 VAC input to 320 Vdc on the DC bus to supply the power stage. Under rated loading, the amplifier delivers 15 A of continuous phase current, producing 50 lb-in of shaft torque from matched motors without overheating. Thermal design also supports a continuous output of 4.5 kW when connected to a 240 VAC three-phase mains supply. Position fidelity is supported by a resolver-to-digital converter with 12-bit resolution and by an encoder emulator that outputs 1024 ppr, allowing downstream motion controllers to read accurate incremental position data. Line-to-line inductance of 6.2 mH filters current ripple, and the 0.395 × 10⁻³ kg·m² inertia rating helps support high-bandwidth velocity-loop tuning.

The controller’s transient operating range is wider than its continuous range, and it can source 30 A for rapid acceleration while absorbing regenerated energy through a shunt that withstands 20 kW in short bursts. Motor surge demands up to 9 kW of peak mechanical power are accepted without compromising servo stability, while peak stall torque reaches 142 lb-in for brief holding periods. At a rated speed of 3000 rpm, the drive maintains velocity-control accuracy of ±22 arcmin. A 40 lb chassis with integral heatsinking mounts in control cabinets and allows space for forced-air cooling paths.