This pulse width modulated (PWM) valve driver module is packaged in a standard DIN plug. It is designed to be used for open loop pressure, position and speed control systems. The output is a unipolar current signal and will drive all proportional and servo valves that have coil current requirements up to 2 amps. The user supplied command signal can be derived from either a potentiometer or external voltage source. The DIN plug construction allows all of the electronics to be mounted directly on the valve and thus eliminates the need for a separate control panel.
This industrial grade module is a true high performance current regulator. It incorporates current loop feedback and a fixed frequency dither signal to maintain the output signal to the valve coil within 2% of the setpoint as the load impedance, input voltage, and ambient temperature are varied over the specified operating range. Pulse width modulated switching provides high efficiency as the output current is varied from minimum to maximum. The module will mate with all valves that have a two or three position DIN 43650, Form A male connector for the solenoid.
Each valve driver module includes a regulated plus 5 volts dc power supply for use with an external command potentiometer as well as multi turn potentiometers to set the minimum and maximum valve coil current. Also included is a signal line that can be connected to the power supply common to disable the output. This feature allows the unit to operate in reversing applications by switching between two solenoids with a single pole, double throw switch. Models are available for external voltage command signals from 5 to 24 volts. A positive 10 to 30 volt DC power supply is required for operation.
The circuit board is solder masked and conformal coated. All external power and signal wiring is made to a color coded, five conductor cable.
Applications: Proportional solenoid valves with male DIN 43650 connectors requiring coil currents up to 3 amps.