Product Description:

The 65WKS-M310/12-PB analog servo amplifier is produced by Kollmorgen as part of the 60wks Analog Servo Amplifiers series. It converts a fixed DC bus into a precisely regulated four-quadrant output so that brushless or brushed servo motors receive commanded currents for accurate speed and position control in automated machinery, packaging lines, and material handling stages. Through analog command inputs, the module interfaces easily with legacy PLCs and motion controllers while maintaining current linearity.

Electrical performance centers on a rated DC-link of 310 VDC, against which the amplifier delivers a continuous four-quadrant current of 12 A and can surge to 30 A for rapid acceleration. The internal control loop processes error signals at a bandwidth of 1 kHz, while the power transistors are pulse-width modulated by an 8.6 kHz output stage clock, minimizing current ripple. A voltage drop of 4.5 V at rated current must be considered when sizing the supply. Motors connected to this drive need a minimum phase inductance of 3 mH so that the current regulators remain stable. Command inputs see an impedance of 150 kΩ, and an auxiliary ±15 V source is available for external sensors. The installed load on the plant mains reaches 2.6 kVA, so cabinet wiring must be sized for that demand.

Protective circuitry is equally important. The drive opens its overvoltage gate at 410 V to shield the DC link. A dynamic ballast resistor engages at 385 V and stays active until bus voltage falls below 365 V, thus bleeding excess energy during regeneration. This resistor can dissipate 200 W continuously and absorb peaks of 5.4 kW for short pulses. Upstream protection requires three gL/gG fuses rated at 20 A per phase, and the input section remains within that momentary fusing limit. With these thresholds, the amplifier can ride through braking events without tripping line breakers while still safeguarding its semiconductor devices.