Product Description:

The SAM-DA-400/480-28B-P4N-F is a servo amplifier manufactured by Danaher within the SAM Servo Amplifiers series. This unit conditions three-phase mains power and regulated low-voltage supplies to drive brushless servo motors in automated machinery. By modulating current to the motor windings, it provides precise speed and torque control, making it a core interface between motion controllers and mechanical axes on assembly lines, packaging equipment, and material-handling stations.

The power stage accepts a nominal mains supply of 400/480 VAC, and its H-bridge can deliver up to 28 A of continuous output current to the connected machine axis. Because the amplifier is designed for three motor phases, it synchronizes current across all stator coils to maintain smooth rotation. Control electronics are fed by an I/O rail of 24 VDC that may fall to 19.2 VDC without dropout; the same voltage thresholds apply to the separate logic supply that serves the microprocessors and gate drives. A single seven-segment window displays one operating-code character, while four error LEDs indicate fault classes at a glance. Two safety-stop inputs allow external emergency circuits to disable the gate signals within the required reaction time.

Network integration uses the Easybus interface over a fiber-optic medium configured in a closed-ring topology, so node communication continues even if one segment is interrupted. Motor power exits through the marked terminals U, V, W, +, -, and PE, which separate the DC-link connections from the phase outputs for orderly cabinet wiring. For auxiliary signals, the front panel provides five brake connector pins and three motor-temperature pins to route brake-coil and thermal-sensor signals back to the drive. Two rotary node-address switches establish the amplifier’s position in the ring, ensuring that deterministic polling intervals are maintained.