The ADN 406 has been developed as a digital servo-amplifier for proportional valves with one magnet. The valve output stages function with fast de-excitation, signifying that the magnet current can be set to 0 in approx. 3–4ms.
Thanks to its high-speed output stage, the ADN 406 is extremely suitable for control tasks in the 0–30Hz frequency range. The module has therefore been equipped with a triple-controller cascade.
The input sensor system is equipped with interchangeable sensor modules, signifying that the module can be operated using the widely-used input signals, such as 4–20mA or +/–10V, or other similar signals. The sensor input modules are equipped with a second-order low-pass filter. Phase shift at 30Hz is approx. 3°, damping at 10kHz approx. 45dB.
The line of action (sign) of the individual sensor modules can be set using the ADN configurator. This permits rapid start-up of the entire system at rational cost.
The external sensors can be supplied with 24V/0.5A DC from the device. A PTC thermistor assures full thermistor-type protection against external short-circuit. Alarms are issued via a separate output, which can be loaded to 24V/100mA.
The ADN 406 is equipped with six opto-decoupled inputs. In standard configuration, these are one Enable input, one Ramp OFF input and four setpoint inputs. Other input configurations are also possible in special cases. The ramps are assigned to the four internal setpoints and can be set from 0.01s to 30s in increments of 10ms. The module can, in addition, also be actuated externally via an analog input. The three controllers are P, I and DT1 controllers with a sample time of approx. 0.1ms. An internal function generator, the frequency of which can be selected from 0.1 to 50Hz, is available for controller optimization. The generator supplies sinusoidal, triangular and square waves. Amplitude and offset can be entered at +/–10V.
All settings on the ADN 406 are effected using the ADN configurator via an RS232 interface linked to a PC or laptop computer.
The software for the ADN configurator is available on the Internet.