Woodward has expanded its digital engine control systems with the introduction of the APECS 500 single-speed electronic engine controller. Woodward said the APECS 500 is designed as a low cost, easy-to-operate control primarily for small generator set manufacturers.
According to Woodward, the APECS 500 controller combines the convenience of manual adjustments with the flexibility of a computer-based calibration tool. Electrical connections consist of six wires for the battery, actuator and magnetic speed pickup. For most applications, APECS 500 can be connected and adjusted with simple hand tools. The controller has a multi-turn potentiometer for speed adjustment and a single-turn potentiometer for gain adjustment, Woodward said.
The APECS 500 is designed to control engine speed by adjusting the fuel-control lever or engine throttle with a Woodward APECS or EPG proportional actuator. The controller will maintain fixed engine speed regardless of load, provided that the engine's available power is not exceeded (i.e., isochronous operation).
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Additionally, Woodward stud the control can be optimized for specific applications using the available APECS calibration tool (ACT), a Windows-based program that can configure a number of parameters, including: proportional, integral and derivative gains; overspeed shutdown and delay; underspeed shutdown and delay; crank-to-run transition speed; warmup speed and time; start-up gains; offset to actuator command; and battery voltage compensation.
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