Product Description:

The LTU350 0 608 750 108 servo amplifier is produced by Bosch Rexroth Indramat as a member of the LTU Servo Amplifiers series. It converts a regulated DC supply into three-phase AC that drives tightening motors used in automated assembly stations. By regulating current and frequency, it provides closed-loop torque control, allowing the production controller to set speed, angle, and final torque from a central motion platform for different fastening tasks. The compact module fits inside controller racks and supports consistent rundown quality across high-volume lines.

Power enters the amplifier at 330 VDC through a dedicated supply rail and is limited to an input draw of 10 A, matching the fuse and bus bar ratings of multi-axis stations. Internally, the PWM bridge switches the DC link at 12 kHz, a carrier frequency that helps limit audible noise while preserving current resolution. The resulting three-phase output can be modulated from 0 to 1000 Hz, giving the controller authority over motor speed from stall to high-speed rundown. At nominal frequency, the stage provides 230 VAC line-to-line at the motor terminals through the integrated contactor. An integrated display presents operating parameters, and clear-text error messages simplify troubleshooting during operation or cycle interruptions.

The output is wired as three-phase, letting balanced currents travel up to 100 m of combined motor and resolver cable without excessive voltage drop. This distance supports remote mounting when the amplifier is paired with the ErgoSpin handheld nutrunner, keeping the lightweight tool free of onboard electronics and reducing the amount of hardware carried at the tool. With a mass of only 3.0 kg, the module can be mounted on DIN rails or panel brackets, and its integrated motor contactor removes the need for external starters in the cabinet.