Product Description:

The CR20560 is a compact drive controller produced by Kollmorgen for the CD Servostar CD Drives series. As a standalone power stage, it regulates three-phase servo motors in automated machinery by converting the plant AC mains to a regulated DC bus and issuing pulse-width-modulated current to the motor windings. Used with resolver feedback, the unit closes the velocity and position loops inside the drive, reducing the load on the host PLC and shortening response times in industrial automation. This arrangement allows motor regulation to remain inside the controller instead of relying on external control hardware for every correction.

The drive can supply a continuous motor current of 20 ARMS and tolerate up to 40 ARMS for two seconds to handle acceleration spikes. When powered from 230 VAC, it delivers 5.2 kW of mechanical output while absorbing 6.8 kW from the mains, with the difference covering semiconductor losses and auxiliary circuits. An internal DC link held at 325 VDC feeds the output stage, and the link is switched at a carrier of 8 kHz to smooth current ripple. Analog ±10 VDC command inputs set torque or velocity, and the resolver supplies rotor angle information so that commutation remains synchronized. Logic circuits are supported by an external 24 VDC feed, and protective thresholds disconnect the inverter if bus voltage falls below 100 VDC or the heat sink reaches its trip point.

Thermal management requires enclosure airflow to remove the internal dissipation of 330 W under full load. Overvoltage shutdown occurs at 400 VDC, preventing drive damage during regenerative events such as rapid deceleration, and a temperature sensor mounted on the power board trips the unit at 80 °C to stop operation before component ratings are exceeded. Resolver excitation is 4.25 VAC with a transformation ratio of 0.47, which supports stable commutation and consistent feedback processing during operation.