Product Description:

The SERVOSTAR CD is a digital servo drive produced by Kollmorgen as part of the Servostar CD Drives series. It supplies controlled three-phase power to brushless servomotors. It closes high-speed current, velocity, and position loops so that automated packaging, material handling, and machining equipment achieve repeatable motion profiles.

The command interface accepts an analog reference of ±10 V, and the input stage tolerates 13 V differential to prevent overrange damage. Internally, feedback values are streamed to a current loop that updates at 16 kHz, while the velocity loop refreshes at 4 kHz and the position loop executes at 2 kHz. This triple-loop architecture combines with a conversion depth of 12 bits on the analog output channel to keep commanded and measured values aligned. As a result, speed variation under load is held within 0.01%. When sinusoidal commutation is selected, the inverter can switch phase vectors up to 400 Hz without losing synchronization to the motor’s electrical cycle. Drive status and diagnostics can also be reported through digital outputs that source up to 60 mA.

The remote encoder port furnishes ±5 V differential excitation while decoding 10,000,000 counts per electrical cycle at a pre-quadrature frequency of 3 MHz, ensuring accurate position capture for multi-turn or high-resolution encoders. Protective circuitry opens a fault relay rated at 1 A at 24 VDC whenever DC bus voltage rises above 430 VDC, falls below 90 VDC, or the heat-sink temperature reaches 80 °C. Additional safeguards include an undervoltage cutoff for field wiring and an overtemperature trip that halts gate firing before component limits are exceeded. The drive can also forward commutation data to a remote follower through differential lines so secondary axes stay phase-locked, and it provides enough digital output current for external signal lamps or interlock coils.