Product Description:

The VT 3006 S36 is an analog amplifier card manufactured by Bosch Rexroth Indramat for the VT 3000 Analog Amplifiers series. Installed in a control rack, the module conditions low-level command signals and supplies controlled current to proportional valve solenoids used in hydraulic motion axes and presses. By translating a voltage reference into a pulse-width-modulated current stream, the card forms the interface between PLC control voltage levels and the inductive load of the valve coils in industrial automation systems.

The card is powered by a nominal 24 V DC supply, with a permissible range between 22 V and 39 V that corresponds to the +60%/-25% tolerance. Internal circuit rails of ±9 V feed the error amplifiers and support a bias current of 20 mA for the solenoid driver stage. When a proportional valve demands full stroke, the board can supply 800 mA to the coil, provided the external supply is at least 28 V DC. Current is switched at 170 Hz, producing smooth magnetic force while keeping switching losses moderate. Upstream electronics encounter a 100 kΩ differential input impedance that limits loading and reduces the effects of ground-loop currents.

Command channels 1 through 4 accept ±9 V references, while channel 5 accepts either a ±6 V reference or a unipolar 6 V direct input, allowing the same card to support symmetric and asymmetric control schemes. The differential stage handles a full-scale span of ±10 V and clamps at that level to prevent overdrive. Field wiring is collected on a 32-pin DIN 41612 Form D header, so the board can be removed without disturbing the harness. A Eurocard footprint of 100 × 160 mm simplifies installation in standard subracks, while a 2.5 A time-delay fuse disconnects the supply during sustained faults. The power section is matched to a coil resistance of 19.5 Ω, allowing the driver to reach nominal force without exceeding its current limit.