The electronic analog amplifier is used to control up to two proportional solenoids and one switch function. As input variable, the control voltage specified by a potentiometer is processed in the amplifier. As output variable, the analog amplifier returns a controlled electric current for controlling the proportional solenoids. If the setpoint voltage at the input is increased, the output current for the respective proportional solenoids increases linearly. Time-ramp functions are implemented in the analog amplifier. These functions can be used to set the time within which the output current is adjusted to a changed setpoint.

The RA analog amplifiers are used to control one or two proportional solenoids, e.g. to control a reversible axial piston unit or a valve slice. Anywhere no complex operations and only a few inputs/outputs are needed, the RA analog amplifiers offer a very affordable alternative to digital controllers. The amplifiers are parameterized via potentiometers directly at the device without additional tools.

Features

• Optional interlocking of the control of the proportional solenoids
• Separately adjustable time for up and down ramps for each solenoid
• Separately adjustable minimum and maximum currents for each solenoid
• Externally adjustable PWM frequency
• Power supply for external setpoint potentiometer
• Monitoring of the setpoint potentiometer for cable break and short circuit
• Externally controllable switched output
• Error output
• Overload protection, overvoltage protection, conditional short-circuit protection