Product Description:

The PC843-001-T is a brushless servo drive developed by Pacific Scientific and supplied within the PC800 to PCE800 Brushless Servo Drives series. In an industrial automation cell, the drive converts DC bus power into controlled three-phase output that closes motion loops for rotary or linear motors, allowing precise positioning, velocity regulation, and torque control. It serves as the power interface between a motion controller and a servo motor so axes on packaging, material-handling, or assembly machines follow commanded trajectories.

Its continuous output capability is rated at 3.75 ARMS, providing steady current for normal duty cycles, while a peak capacity of 7.5 ARMS supports short acceleration bursts without saturation. During power-up, the DC link can draw an inrush of 175 A, a figure relevant when sizing upstream fuses and contactors. Power stage efficiency reaches 97%, so only a small portion of the input is lost as heat across the 192 mm depth and 121.7 mm width enclosure. Internal switching takes place at a ripple frequency of 16 kHz, and this high carrier helps lower motor acoustic noise while smoothing the current waveform. The drive can interface with motors whose inductance ranges from 5 mH to 5 H, giving flexibility across different magnetic designs.

Dynamic braking energy is diverted to an internal shunt where the bus can absorb 35 J per event. For sustained deceleration, the shunt handles up to 10 kW in combination with an external resistor bank rated at 200 W. That resistor has a value of 66 Ω, matching the drive’s chopper circuitry. Isolation between the regeneration circuit and the chassis is maintained to 1500 V, protecting adjacent control electronics. This arrangement supports controlled braking and helps reduce electrical disturbance near nearby control circuits. The housing stands 254 mm high, and the geometric footprint together with its thermal margin lets the drive mount in crowded cabinets while complying with required clearances.