VT-KRRA 2-537-20/V0 Bosch Rexroth Indramat
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MPN: 811405082
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The Bosch Rexroth Indramat VT-KRRA 2-537-20/V0 is an electric amplifier from the VT-KRRA Electric Amplifiers series and has a nominal supply voltage of 24 VDC. It features two output stages, a maximum solenoid current of 3.7 Amps, and supports a transducer supply of ±15 V at 200 mA. The circuit board measures 160 mm in length by 233.4 mm in width, and the device weighs 0.54 kg.
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Product Description:
The VT-KRRA 2-537-20/V0 amplifier card is produced by Bosch Rexroth Indramat for the VT-KRRA Electric Amplifiers series. Designed for proportional cartridge or directional valves, the board converts low-level command signals from a PLC or analog controller into regulated current that actuates two hydraulic solenoids. In industrial automation, this function allows closed-loop pressure or flow control without mechanical relays, providing faster response and finer resolution within servo-hydraulic axes.
All electronics on the card are powered by a stabilized 24 VDC supply, so power cabinets can share a common low-voltage bus. The command input terminals present a high impedance of 100 kΩ, minimizing the load on upstream analog modules. Each output stage can deliver up to 3.7 A to a valve coil, ensuring full stroke even with low-resistance windings, while internal peak limiting protects the driver transistors. A built-in reference source of ±10 V at 10 mA is provided for external potentiometers or position transducers. When both stages operate simultaneously, the board draws no more than 2.7 A per valve, which supports appropriate selection of cabinet power supplies and wire sizes.
To place the amplifier in a ready state, the enable line must rise above 8.5 VDC; below this threshold, the outputs are clamped to zero to prevent unintended motion. Each channel can transmit up to 55 VA per valve of electrical power to the solenoids, supporting dynamic ramping without overheating. Position feedback devices can be powered by the dedicated ±15 V at 200 mA regulated rail, provided their combined load impedance is at least 10 kΩ. The board weighs 0.54 kg and occupies a 160 mm × 233.4 mm Eurocard footprint that plugs into a DIN 41612 Form D backplane. A 100 mA fault output is available for system diagnostics.
