AN528 / AN228

Servo Amplifier

The amplifier AN528 was developed to control proportional valves in a closed-loop control. The AN527 is used as a basic unit. By connecting a special module it is possible to drive the AN527 as the AN528 together with positioning controlled proportional valves.

The AN527 is only used to control proportional valves. Therefore, as this board is not only an amplifier for controlled valves (AN527) but also the basis for the closed-loop controller (AN528) it is not completely packed, and some different adjustment possibilities are not described, if it’s used as the AN527.

Features:

• Secured against wrong polarity
• Secure of short-circuit
• External switch-off ramp
• Ramp with quadrant identification
• Wide range of ramp adjustment
• External enable (no-load current circuit)
• Test jack for: desired value, valve current, displacement pick-up signal
• Same potential of: minus of the supply voltage
• zero-potential of the inputs
• zero-potential of the reference voltage
• PWM - output stages (high dynamic)
• 4 different inputs for the most popular input-voltages and -currents, allows very flexible input switching
• LED indication for: Power on, Ramp off, Fail safe
• Potentiometer for: Ramp time, Zero overlapping, gain