Product Description

Bosch Rexroth Indramat manufactured the VT 2228-1X. The device's comparatively low power needs are reflected in its power consumption, which stays below 25 VA. This, in turn, directly affects the thermal system's and power supply's designs. The amplifier's low consumption profile is further defined by a current draw of less than 1 A. A 2.5 A slow-blow fuse is used to avoid overheating or harm to external devices or internal circuitry. This prevents long-term overcurrent scenarios while permitting short inrush currents. Two separate input channels that are specifically designed for accuracy in industrial signal situations form the foundation of the amplifier's control mechanism. Among such channels is a single-ended input channel that uses a ground-referenced command signal between 0 and +9 V. It is thus perfect for less complex control systems without differential outputs. With a high impedance of 100 kΩ, the other channel is a differential input that can receive a signal between 0 and +10 V. This rejects common-mode interference, making it optimal for settings with high electrical noise.

To control the speed at which the output current reacts to changes in the input, the amplifier has a variable ramp time function. Depending on the internal jumper settings, that ramp time may be changed to as little as 30 ms or as much as 1 or 5 seconds. In hydraulic and pneumatic systems, where sudden changes in solenoid current might cause mechanical shock, fluid instability, or premature wear, this kind of control over signal ramping is crucial. The main functional output of the amplifier is its current output, which may be adjusted from 0 to 800 mA. It is used to regulate a proportional solenoid. In fluid control systems, that current directly affects the solenoid's actuation, which in turn affects the force or position of the valve. Because solenoid resistance is typically 19.5 Ω, you may use a voltage signal ranging from 0 to 800 mV to measure that current. This makes it possible to integrate into feedback loops without the need for extra sensors and simplify diagnostics.

An internal clock that alternates between 100 Hz and 200 Hz affects the output current's steadiness and resolution. You use jumper S2 to choose that frequency. In high-speed control loops where current integrity and quick actuation are necessary, a higher frequency improves responsiveness and decreases ripple. The amplifier has a load capacity of ±25 mA and precisely controlled ±9 V outputs with ±1% tolerance in addition to power supply control. The results are intended to be consistent and dependable. The VT 2228-1X's mechanical design ensures reliable environmental performance and consistent installation. It is 100 x 160 mm in size and adheres to DIN 41 494 Euro-card standards. A DIN 41 612 32-pin connector (form D) is used to provide electrical connection, enabling a standardized interface for rapid integration into multi-module systems. Euro-rack modular systems are compatible with the front panel's dimensions, which are 3 HE in height and 3 TE/1 TE in width.