Product Description:

The PC842-XYZ-T is a brushless servo drive produced by Pacific Scientific as part of the PC800 – PCE800 Brushless Servo Drives series. It conditions three-phase mains power, rectifies it to a regulated DC link, and modulates that energy through an IGBT stage so permanent-magnet motors in packaging lines, gantries, or indexers receive precise torque and velocity commands. Integration is handled on the SERCOS network, and a TB Adapter Connector Kit is supplied for quick field wiring.

Inside the power section, the drive maintains a DC bus of 320 VDC when it is fed from a 240 VAC three-phase source. Under continuous load, it can supply 2.7 A RMS to the motor windings, while short accelerations are supported by a peak capability of 5.3 A RMS. A carrier frequency of 20 kHz governs the output ripple, reducing audible noise and current ripple in high-resolution servo loops. Power stage efficiency reaches 98%, meaning almost all incoming energy is delivered to the motor instead of being lost as heat. The allowed motor inductance spans from 4.0 mH to 4 H, supporting stable current control across a broad motor family. Line demand on the supply is 4.5 A RMS, and regenerative braking events are limited to a 6% duty cycle so the internal shunt circuitry remains within thermal limits.

The drive can deliver 1.1 kW continuously and up to 2.25 kW during brief overloads, providing headroom for high-inertia starts. Excess kinetic energy is dissipated through an internal resistor rated for 800 W average and capable of absorbing 12.8 kW in momentary peaks, protecting both the drive and bus capacitors from overvoltage. The specified inductance window supports use with a variety of low-to-medium inertia brushless motors, while the resistor and current limits help maintain controlled deceleration and limit heat buildup.