Product Description:

The 66WKS-P310/90-B is an analog servo amplifier from Kollmorgen’s 60WKS Analog Servo Amplifiers series. The module conditions the DC bus, regulates current, and feeds brushless or brushed servo motors in positioning stages, packaging lines, and other precision axes. It receives analog velocity or current commands and converts them into controlled motor torque, acting as the power stage between motion controllers and mechanical loads. The unit is intended for cabinet installation, where compact heat sinks remove switching losses.

The amplifier runs from a rated DC link of 310 VDC, which is stored in its internal capacitors and serves as the energy reservoir for the motor phases. Under forced-air cooling, the power stage can deliver up to 90 A of DC output, whereas natural convection limits the available current to 30 A. These current limits set the maximum continuous torque available from the connected motor. The installed power capacity is 25 kVA, indicating the maximum apparent power required from the supply system. During operation, the semiconductor bridge dissipates 250 W as heat, so adequate airflow or heat sinking is required to stay within temperature limits. The module enclosure measures 220 × 233.4 × 50 mm and weighs 1.2 kg, allowing high power density in crowded control panels.

Protection and energy-dumping functions are integrated into the unit. A ballast circuit rated for 10 A draws excess bus energy through an external resistor; the circuit supports up to 380 V across the resistor and requires a minimum resistance of 4.7 Ω. The bridge rectifier section is protected by 3 × 63 A fuses that isolate the supply under abnormal fault current. DC ripple is limited by a 1800 µF electrolytic bank, and the undervoltage monitor disconnects the drive if the bus drops to 110 V to help prevent control loss. A floating relay contact, limited to 100 V at 0.1 A, signals ready or fault states to higher-level safety logic.