This linear valve driver module is designed to be used for unidirectional open loop motion, pressure and speed control systems. The output is unipolar and will drive all servo valves and pump displacement controllers that have coil current requirements up to 200 ma. The command signal can be generated from either a potentiometer or external voltage source.
This industrial grade module is a true high performance linear current regulator. It incorporates a stable reference and current loop feedback to maintain the output signal to the valve coil within 1% of the setpoint as the load impedance, input voltage, and ambient temperature are varied over the specified range. This linear valve drivers uses a single ended output driver and is not recommended for use with systems that have rapidly changing input command signals.
Each linear valve driver module includes an optional internal command potentiometer as well as a range select jumper and provisions for a maximum output trim adjust potentiometer. The module also contains provisions for the use of an external command potentiometer or the ability to follow a remote command voltage signal. The output current to the valve coil will vary from zero to the maximum as the input signal is adjusted from zero to the rated value. The module requires a positive 10 to 30 volt DC power supply for operation.
The circuit board is solder masked. All external power and valve coil connections are made to a barrier type terminal block with #6-32 captive wire clamping plates. External command signals are made to .25 inch male tabs. All external connections are clearly marked on the board. The board can be mounted in the user's control enclosure on standoffs or located in plastic mounting track.
Applications: Unidirectional, servovalve driver, electrical pump or motor displacement or pressure controllers, maximum coil currents to 200 ma.