Product Description:

The 60WKS-M240/12-RB is an analog servo amplifier produced by Kollmorgen within the 60WKS Analog Servo Amplifiers series. Designed for cabinet installation, the unit conditions DC bus energy and supplies controlled current to matched servomotors so position, speed, and torque commands from a motion controller are executed accurately on the machine floor. By managing regenerative energy through an onboard ballast circuit, it protects upstream power supplies during rapid deceleration sequences.

The power section has a rated DC-link voltage of 240 V, so the amplifier’s linear stages receive a constant intermediate voltage even when the line voltage fluctuates. Under continuous load, it delivers 12 A of output current, while fast indexing moves can draw up to 30 A for short bursts. A current-loop bandwidth of 1 kHz permits tight torque control, and the PWM bridge switches at 8.5 kHz, which keeps ripple low relative to motor inductance. The minimum permissible motor inductance is 1.2 mH to maintain loop stability. An output current form factor of 1.01 indicates that RMS and average values are nearly identical, reducing copper losses. When the link voltage rises to 300 V, the ballast engages, and it disengages once the level falls to 285 V. The voltage drop across the output stage at rated current is 5 V, and quiescent dissipation is limited to 12 W.

Cabinet heat calculations use an installed load of 2 kVA at rated current as the sizing reference for upstream transformers and line contactors. An internal limiter disconnects the drive at an overvoltage switch-off threshold of 325 V to shield semiconductors from excessive stress. During dynamic braking, the ballast network can absorb 5.4 kW in short pulses, while its continuous capacity is 135 W, allowing it to manage extended deceleration periods. Internal losses at full load reach 85 W, and enclosure airflow must remove this heat to keep component temperatures within their operating limits.