Product Description:

The PC844-001-N is a brushless servo drive manufactured by Pacific Scientific and included in the PC800 – PCE800 Brushless Servo Drives series. It regulates torque, speed, and position for permanent-magnet motors used in automated cells that communicate over a SERCOS network. Separate motor and control power inputs let the motion section shut down while logic remains active for diagnostics and fieldbus supervision.

The drive supplies a continuous phase current of 7.1 A RMS; this is the steady-state limit before heat sinks reach their design temperature. With forced-air cooling, the RMS current can rise to 10.6 A for additional torque margin. Continuous mechanical output is rated at 3.0 kW, matching medium-frame servomotors on pick-and-place or index axes. For brief accelerations, it can deliver a peak phase current of 21.2 A RMS and reach 9.0 kW of shaft power, values bounded by thermal time constants and bus capacitor energy. All power devices reference a bus of 320 VDC, created internally from the three-phase 180–265 VAC motor supply, while the control section remains powered from an 85–265 VAC auxiliary feed or 130–370 VDC source to keep network communication alive during mains dips.

Pulse-width modulation is generated at 16 kHz, keeping current ripple outside the audible range and minimizing torque distortion. Cabinet placement is flexible because the amplifier drives motors through cable runs up to 50 m. It supports phase inductances between 1 mH and 1.25 mH, so most low- to medium-inertia servomotors connect without external reactors. Physical integration is aided by a height of 198.1 mm, a width of 114 mm, and a depth of 158 mm, allowing side-by-side mounting in shallow panels while maintaining the airflow path required for the forced-air rating.