Product Description:

The PRD-B040EAIC-62 is a digital servo amplifier produced by Kollmorgen for the CD Servostar CD Drives series. Designed for permanent-magnet AC servomotors, the drive converts power from the regulated DC bus into pulse-width-modulated phase currents and closes the motor current loop onboard. It uses resolver feedback for commutation, and a 24 V DC external logic supply keeps the control electronics active during main-power shutdowns.

During operation, the drive receives a 14-bit analog velocity or torque command, so its reference resolution supports fine speed adjustments in tensioning and indexing axes. Continuous armature current is rated at 6 A RMS, allowing the inverter section to sustain up to 2.2 kW of mechanical output power when the DC-link voltage is 325 V DC. The embedded digital signal processor refreshes the current regulators every 62.5 µs, keeping phase lag low for stiff, low-cogging motion profiles. During short overloads, the output can rise to 12 A RMS for two seconds, providing extra torque for acceleration, while the carrier is modulated at 8 kHz to minimize audible noise and reduce torque ripple. An available dynamic brake network requires at least 20 ohms of shunt resistance and can dissipate 200 W of regenerated energy, preventing the DC-link voltage from exceeding the 430 V DC overvoltage threshold.

Additional protection functions monitor current peaks and thermal limits. For half-second transients, the power stage tolerates up to 18 A RMS, after which the control reduces the duty cycle or issues a fault. An internal sensor trips the unit at 80 °C to protect the IGBT junctions from excessive heat. An input-side watchdog shuts down the system if the bus voltage drops below 90 V DC, indicating an undervoltage event or loss of main power. These protective limits work with the servo algorithm to provide predictable responses during coordinated multi-axis operation without interrupting the external logic supply unnecessarily.