VT-VARAP1-537-20/V0 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat VT-VARAP1-537-20/V0 is an electric amplifier from the VT-VRPA Electric Amplifiers series and weighs 0.49 kg. It features a nominal supply voltage of 24 VDC and a typical power draw of 55 W. The amplifier has a card format size of 100 x 160 mm and uses a DIN 41612 F32 connector.
Internal Product Review
The VT-VARAP1-537-20/V0 is a Bosch Rexroth Indramat electric amplifier with a 24 VDC nominal supply and 55 W typical power draw. Technical performance stands out with 100 kΩ command input resistance and a valve solenoid output rated to 3.7 A / 60 VA, supporting stable proportional valve control. A DIN 41612 F32 connector adds practical integration value, making the unit a strong choice for dependable hydraulic amplifier service.
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Product Description:
The VT-VARAP1-537-20/V0 is an electric amplifier card manufactured by Bosch Rexroth Indramat for the VT-VRPA Electric Amplifiers series. It is designed for integration into closed-loop hydraulic control circuits used in industrial automation systems. When installed in a 19-inch rack, the unit shapes command signals and supplies power to proportional valve solenoids, allowing precise pressure or flow modulation. Its card-based format provides access to test points and trimming potentiometers from the front of the rack.
The amplifier operates from a nominal bus voltage of 24 VDC, and its internal regulators limit peak current consumption to 2.7 A. During normal operation, the card has an average power draw of 55 W. Command signals enter through a 100 kΩ differential input stage, which minimizes electrical loading on upstream PLC analog outputs. The card connects to the rack through a DIN 41612 F32 connector mounted on a 100 × 160 mm Eurocard, while the front panel occupies 7 TE of rack space. A separate +15 V sensor supply delivers 35 mA and is protected by a 25 Ω series resistor. Adjustable gain and zero settings are controlled through a 10 kΩ multiturn potentiometer, allowing the signal response to be matched to the connected hydraulic valve. Built-in current ramps limit sudden current changes when the solenoid output is activated.
Diagnostic functions include an error output that can sink or source up to 100 mA, allowing drive faults to be connected directly to external monitoring circuits or safety relays. LVDT excitation is stabilized at ±15 V to support consistent valve-position feedback during closed-loop operation. The solenoid driver supplies up to 3.7 A / 60 VA, providing the current required to control valve spool movement under demanding hydraulic loads. The complete assembly weighs 0.49 kg, reducing the load placed on the rack guides and backplane connector. Its compact Eurocard format allows the amplifier to fit proportional valve control racks that use compatible Rexroth electrical connections and signal arrangements.
