Product Description:

The VT1600 servo amplifier is produced by Bosch Rexroth Indramat as a member of the VT 1600 Servo Amplifiers series. It conditions command signals and supplies controlled current to proportional or servo valves so that motion axes in industrial machinery follow reference inputs with repeatable accuracy. By accepting a differential input and modulating valve coils, the unit forms the interface between a motion controller and a hydraulic actuator within closed-loop automation.

The amplifier’s power stage is matched to valve coils that measure 2000 Ω at room temperature, limiting current draw when driving high-resistance transducers. An internal reference of ±10 V supports bipolar control, allowing symmetrical positive and negative command voltages for bidirectional actuation. Control electronics consume up to 200 mA from the 24 V supply, a value that determines cabinet power budgeting and fuse sizing. To improve valve spool responsiveness, the amplifier adds a dither current of 3 mApp at a carrier of 340 Hz; this high-frequency ripple reduces static friction so small signal changes translate into proportional flow adjustments. Relay outputs operate between 22 V and 28 V with a switching window of 1 ms, enabling rapid status signaling to a PLC.

Thermal limits permit continuous operation up to 50 °C and down to 0 °C, so the card can remain in common control cabinets without forced cooling. When the machine is idle, on-board relays can still actuate because the permissible coil voltage peaks at 28 V, preventing drop-out during supply transients. For logistics and spares, the electronics withstand storage temperatures from 70 °C down to -20 °C, ensuring functionality after warehouse or transport exposure. This operating range suits typical control-cabinet use and standard warehouse storage.