2224 VALVE CONTROLLER

• Front-programmable

• mA-, V-, and .-programmable input

• Ramp times, jump values, reversal, chopper frequency, and deadband

• 3-digit LED display shows I valve % value

• 1 or 2 channels

• Modulated current output forproportional valve

Applications:

Control and regulation of single- or double-coil hydraulic and pneumatic proportional valves. The unit is used for accurate oil flow regulation, linear soft acceleration and deceleration, modulated output signal, and programmable deadband. Is highly suitable for joystick regulation of A/B movements.

The 2224 Valve Controller is a microprocessor-based unit containing ramp functions for soft start and stop and jump functions thus avoiding deadband at start and changes between A & B valves. The user interface of the valve controller consists of three pushbuttons and a 3-digit LED display. By using these, output currents, ramp times, jump values, chopper frequency, reversal, deadband, and on/off functions are changed. During operation the display shows the present output signal as a % of the I valve. All parameters are protected against unauthorised changes with a password. Changes between A and B valves are made either by a digital signal or by a joystick connected to the internal ±10 V supply. The A/B function can also be controlled by a normal ±10 V process signal. The output current can also be enabled/ disabled by the digital controlling signal.

Programmable current or voltage input for standard signals acc. to order schedule, joystick/potentiometer or a special non-programmable input. Digital inputs for external control functions.

A pulsating current output prevents the connected valve from sticking. Optional programming of the modulation frequency (PWM) between 8 and 400 Hz. The internal measuring and control circuit ensures that the mean current never exceeds the entered I valve. The peak current can never exceed 7 A.