PERFORMANCE CONTROLS, INC.® Hi-Reliability Digital Servo Amplifier for Brushless Motors ACD4000

The ACD 4000 is a fully digital servo amplifier designed for long life in extended temperature environments for applications such as RADAR, Power Generation, and other remote applications without environmental controls. The amplifier can control up to a 4000 Watt (5HP) BLDC servo motor in torque or velocity loop mode and can be digitally configured for a wide range of motors. The amplifier is mounted on a rigid aluminum base plate and may be enclosed by an optional metal cover. In addition to providing the mechanical stability of the package, the base plate provides significant thermal mass, benefiting high crest factor applications, as well as a low thermal interface impedance for conduction of the average power dissipation of the amplifier. It is intended that the base plate will be mounted on a surface that removes heat such that the base plate temperature does not exceed 60° C, although temperatures up to 80° C are allowed with current derating. To protect the amplifier and the motor, two different algorithms are used to track the thermal impact of the output current. The amplifier is protected using an advanced, real-time adaptive thermal model developed to limit extreme thermal cycling of the power devices as well as control their maximum junction temperature. At the same time, the amplifier protects the motor from thermal degradation by using a user programmable time constant and limit threshold applied to an independently maintained RMS current value. Short circuit and instantaneous over-current conditions are detected through multiple means, providing the redundancy necessary to achieve high system reliability. A tri-state (Red/Yellow/Green) LED provides a visual indication of the status of the amplifier.