The Kollmorgen CR10251 is a servostar CD drive amplifier from their Series 2 line, with an updated Series 5 version also available. It employs a SERCOS interface and uses a 230V logic input. The amplifier supports resolver feedback used to track the motor shaft position, with the option to order models supporting encoder and sine encoder feedback as needed. Significantly, the amplifier utilizes a resolver, functioning akin to a transformer, having a unique output for different shaft positions. The resolver operates on a sine wave reference signal with specifications including a transformation ratio of 0.47, and a modulation frequency between 7-8kHz. The recommended maximum cable length is 75 feet to avoid performance decline, shielded to minimize noise interference. The amplifier current rating is 10 Amps, with a peak output of 20 Amps for 500 milliseconds. It's designed for an AC input of 230V, drawing continuous current of 13 Amps, and peak current of 26 Amps.
