VT 5003 S41 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat VT 5003 S41 is part of the VT-5000 IO Cards series and features a 32-pin connector that adheres to the DIN 41612 Form D standard. The card is equipped with a PID controller, has inductive position feedback, and is compatible with the DBETR 6 valve. Its voltage range is 22 to 35 VDC, with a nominal voltage of 24 VDC, and it includes a current-regulated, clocked output stage.
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Product Description:
The VT 5003 S41 is an input/output conditioning card developed by Bosch Rexroth Indramat for the VT-5000 I/O Cards series. Designed for cabinet mounting inside hydraulic control racks, the board interfaces directly with a DBETR 6 pilot-operated proportional pressure valve and supplies the closed-loop electronics needed for accurate spool positioning. By converting differential command signals into a regulated coil current, the card enables stable pressure or flow regulation within industrial hydraulic circuits.
Electrical integration is centered on a 24 VDC supply that feeds the analog and power stages through a raised-zero design. Connection to the rack backplane occurs through a 32-pin header built to the DIN 41612 Form D pattern, allowing convenient installation without soldering. Signal processing follows a PID algorithm, so proportional, integral, and derivative gains can be adjusted with onboard potentiometers to match valve dynamics. An internal clock running at 2.5 kHz drives the pulse-width modulation oscillator, providing fine current resolution while keeping switching losses in the valve coil low. Differential inputs reject common-mode noise from long field cables, and the inductive position transducer in the valve returns spool feedback to close the control loop.
The power section tolerates transients as long as the voltage remains between 22 V and 35 V, so machine power supplies with moderate ripple can be used without additional regulators. A built-in offset network establishes a reference of 9 V, shifting the control range upward to prevent saturation at zero command. The output stage uses a current-regulated, clocked design that modulates coil energy in fixed increments rather than dissipating energy through linear regulation, improving thermal efficiency inside the cabinet. Inductive position feedback allows the card to monitor valve movement and correct deviations from the command signal. Differential command wiring reduces the influence of electrical interference, while the regulated output helps maintain stable actuator behavior across temperature changes and supply variations without external conditioning modules.
