Pulse width modulation (PWM) module PFC

PFC Voltage card PWM with threshold, and full output adjustments and LED diagnostics. Overview • PWM with threshold • 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 & PFC/CR - Precise Proportional Control for Electro-Hydraulic valves for material handling equipment and in-plant industrial machinery. PFC - Unregulated diver boards are economical and utilized for controlling Electro-Hydraulic valves for mobile and in-plant equipment where a variance in output is not critical to the equipments performance. Features for PFC : • 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.