VT-VRRA1-527-10/V0/RV

The VT-VRRA1-527-10/V0/RV is a plug-in electric amplifier manufactured by Bosch Rexroth Indramat for the VT-VRPA Electric Amplifiers series. It slides into a 19-inch rack and conditions command and feedback signals so a proportional valve can be driven with stable current in automated hydraulic systems. By converting a low-level reference voltage into a controlled solenoid output, the module forms the interface between a PLC or analog motion controller and the field-mounted valve hardware.

The amplifier operates from a nominal supply of 24 V DC and tolerates excursions up to 40 V DC. Internal electronics draw a maximum of 1.5 A, while the closed-loop stage samples spool position with an actual-value signal of 10.4 V at 8 kHz. Three discrete command levels of 3.5, 6.5, and 9.5 V select proportional flow ranges. A front plate that is 7 TE wide provides trim potentiometers and test points for setup and diagnostics. The supply section maintains stable voltage to prevent the reference signals from drifting. A fixed zero-point adjustment maintains the valve’s neutral position without requiring routine field calibration.

The power stage can deliver up to 2.7 A to the valve coil and supports a maximum load of 25 VA, helping keep the solenoid’s thermal rise predictable. Typical overall consumption of the module is 35 VA, which limits demand on the cabinet power supply. A fault-free status relay contact supplies 24 V at 0.1 A to indicate normal operation to external control logic. The DIN 41612-F32 connector carries both supply and control conductors through a single rack connection. The board operates at ambient temperatures from 0 °C to 70 °C. This operating range supports use in control cabinets exposed to substantial internal temperature changes.