Product Description:

The PC842-001-T brushless servo drive is manufactured by Pacific Scientific and belongs to the PC800–PCE800 Brushless Servo Drives series. It regulates three-phase power for matched servomotors and closes torque, velocity, and position loops inside automated equipment. By translating motion commands into precisely timed switching patterns and dissipating regenerated energy through its internal shunt, the unit supports controlled axis motion in conveyors, pick-and-place stations, and packaging lines. Its control architecture is suited to applications that need repeatable speed regulation and accurate position response during changing loads.

The drive accepts an analog reference up to ±13.5 V and also communicates over a SERCOS network for coordinated multi-axis control. It delivers a continuous phase current of 2.7 ARMS and supports an output power rating of 1.1 kW at 240 VAC, three-phase. Mains input current is rated at 4.5 A at 240 VAC, three-phase, while copper and switching losses are limited by a power-stage efficiency of 98%. Pulse-width modulation occurs at 20 kHz, which keeps acoustic noise above the audible range and helps minimize current ripple. Motors connected to the drive must present at least 4.0 mH of inductance for loop stability, and the DC link can absorb 20 J at 320 VDC before the dynamic brake activates.

For short bursts, the amplifier supplies up to 5.3 ARMS, allowing rapid acceleration without immediate thermal trips. Rotor position is digitized to 24 bits/rev through the resolver interface, and encoder outputs are retransmitted at 833 kHz for high-speed feedback to external controllers. Regenerated energy is sent to an integral resistor that dissipates 800 W continuously and tolerates surges of 12.8 kW (500 ms), which helps prevent DC bus overvoltage during emergency deceleration or vertical-axis drops. These electrical, thermal, and feedback limits set the operating range for motor selection and motion-profile settings.