Product Description:

The 7429AC servo amplifier is produced by Copley Controls as part of the DC Servo Amplifiers series. It serves as the power interface between an automation controller and a three-phase brushless motor, delivering regulated current that translates command signals into shaft torque and velocity. In industrial assembly cells, packaging equipment, or semiconductor tools, the unit allows closed-loop motion systems to use AC mains power while retaining the fast response of DC commutation stages.

The power section accepts 32–264 VAC at 50/60 Hz, allowing one model to operate with low- and high-voltage mains supplies. It supplies ±10 A continuously and up to 20 A during brief overloads, routing this current through an IGBT bridge so switching losses remain low while the output follows the incoming digital PWM control stream. Separate motor and signal connectors in a Sub-D format limit crosstalk, while the PMAC2 H-Bridge interface delivers position-based phase commands. The U and V feedback lines provide real-time current monitoring, and an output filter can be fitted when long cables require additional smoothing.

The enclosure measures 190.5 × 176.3 × 69.1 mm, and its 2.5 hp rating suits midsize rotary servomotors. Phase energization relies on an externally supplied sinusoidal waveform, providing flexibility for field-oriented control strategies. Drive logic is protected by optical isolation, which keeps high-energy switching transients away from command lines. This isolation also permits the amplifier to float with respect to machine ground, which is useful when multiple drives share a common cabinet but use different control references. It helps prevent ground-loop currents that could distort analog feedback signals and protects upstream digital controllers from conducted electrical noise.