VT 3033-11B

Product Description:

Bosch Rexroth Indramat manufactured the VT 3033-11B analog amplifier. To run smoothly and dependably, this amplifier requires a DC power supply. That means a nominal input of 24 VDC with a tolerance of ±10%. That's a buffer zone to account for the slight variations you see in industrial power systems. Without that controlled input voltage, the amplifier's underlying electrical design won't function as it should. You'll get inaccurate current control and signal conditioning—and potentially irreversible circuit damage, distorted signals or poor control responses. That 10% margin strikes a balance between circuit safety and operational flexibility. It lets you integrate the amplifier into various automation systems without sacrificing performance. The amplifier's energy requirement—30 W—isn't huge, but it's substantial enough to affect thermal engineering and power supply design. That consumption rate directly influences the size of your upstream power infrastructure and safety equipment.

You calculate that consumption rate using the fundamental formula P=VI. Heat is what happens when power is dissipated—and you need to control that heat to prevent component deterioration. If you don't, excessive heat can speed up failure processes, alter semiconductor behavior or lower signal quality. To keep the amplifier effective and increase its operating lifetime under constant industrial use, effective thermal design—like heat sinks or forced-air cooling—is essential. To preserve signal quality and load compatibility, you need to know the input and output interfaces' electrical properties. A minimum input impedance of 500 Ω preserves the amplitude and form of the signal entering the amplifier. That means low loading of the input signal source. In complicated automation networks, where signal deterioration can spread across many nodes, a high input impedance reduces the amount of current used from the control side.

On the output side, the maximum permissible load resistance is 19.5 Ω. That limit determines the amount of current the amplifier can safely provide without going over its rated power dissipation or stressing the output transistor. Below that level, loads with resistance values run the risk of causing excessive current flow—hastening thermal stress or electronic breakdown. The VT 3033-11B's current output profile is designed for solenoid control applications. It provides a wide actuation range with a low bias current of 20 mA and a maximum of 800 mA. When a control signal is provided, that baseline current minimizes delay by keeping the amplifier output stage responsive. When sizing linked actuators, that 800 mA maximum current limit is crucial. It determines the amplifier's capacity to drive high-force mechanical components without thermal overload or saturation. The device can accept pulse frequency inputs between 160 and 180 Hz—the typical control signal frequencies seen in industrial automation systems.