Pulse width modulation (PWM) module PFC / CR

Type PFC-CR current regulated card with threshold and full output adjustments and LED diagnostics. Overview • Current regulated. • Threshold and full output adjustments. • LED diagnostics. Options: • Dual full output adjustment. • Ramp adjustment. • High/low range adjustment. • 12 and 24 V models for most single and dual coil valves. Application: PFC/CR - Precise Proportional Control for Electro-Hydraulic valves for material handling equipment and in-plant industrial machinery. PFC/CR - Regulated driver cards are utilized to control ElectroHydraulic Proportional Valves for mobile equipment in applications where output fluctuations due to supply voltage or valve coil resistance changes must be kept to a minimum. Features for PFC/CR: • Pulse Width Modulation: The power to the valve coil is switched on and off at a fixed optimum rate (dither frequency) to overcome factors that detract from smooth valve performance such as stiction, hysteresis and mechanical tolerances. The “on” time versus the “off” time at this optimum frequency is varied to provide a proportional output. • Threshold Adjust: Valve deadband at the beginning of spool travel can be eliminated or set to the desired level. • Full Output Adjust: Usually set so that the maximum output of the valve is achieved when the controlling device (joystick handle) reaches the point of maximum travel. Also used to limit maximum output when necessary. • Auxiliary Output: Provides a switched source of power at the supply voltage, whenever the PFC/CR is switched on. (3 amps, max.) • Reverse Polarity Protection: On board diodes prevent damage due to reversed wiring.