PC834-117-N Pacific Scientific
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The Pacific Scientific PC834-117-N is part of the PC800 - PCE800 Brushless Servo Drives series and delivers a continuous output current of 7.1 ARMS with a peak output current of 21.2 ARMS. This drive operates with a continuous output power of 3.0 kW at 240 Vac 3-phase and achieves a power stage efficiency of 98 percent. It features command interfaces such as RS-232/485, step/dir, and indexing, and supports a maximum step/dir frequency of 800 kHz.
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Product Description:
The PC834-117-N is a brushless servo drive manufactured by Pacific Scientific for the PC800–PCE800 Brushless Servo Drives series. The unit converts 240 VAC three-phase power into precisely regulated currents and voltages for synchronous motors used in positioning, packaging, and electronics assembly equipment. Its digital and analog control resources let motion controllers maintain tight torque, speed, and position loops throughout automated cells. The available command interfaces support integration with several types of machine control systems without requiring a single fixed command format.
The drive delivers a continuous motor phase current of 7.1 ARMS, corresponding to a sustained mechanical output of 3.0 kW when supplied from a 240 VAC three-phase line. Its switching devices operate at a ripple frequency of 16 kHz, and the power stage maintains 98% efficiency to keep the enclosure heat load low. The current regulator is refreshed every 62.5 µs, while a control bandwidth of 1.5 kHz supports a responsive dynamic torque output. Command paths include RS-232/485 connections, differential ±10 V analog inputs, step-and-direction streams, and onboard indexing. The step-and-direction port accepts pulse trains up to 800 kHz, supporting high-resolution position commands at elevated motor speeds. A capacitor bank absorbs 40 J of regenerated bus energy to protect the DC link during rapid deceleration.
Short-duration demands are handled by a peak inverter that supplies 21.2 ARMS and reaches a peak phase current of 30 A (0-pk). Under peak conditions, the drive provides an output of 9.0 kW for rapid acceleration and other transient loads. Kinetic energy beyond the capacitor limit is diverted to a resistor rated for 12.8 kW of instantaneous dissipation. This braking path limits rising DC-bus voltage when a connected motor returns energy during abrupt speed reductions. Control stability is maintained with motor inductances ranging from 1.25 mH to 1 H, allowing the current loop to operate with motors that have widely different electrical characteristics. Differential analog commands remain linear across a ±13.5 V input window, providing additional range around the nominal command level.
