Operation Manual

APECS 3100 ELECTRONIC
ENGINE SPEED GOVERNING SYSTEM
APECS Advanced Proportional Engine Control System
is an engine speed governing system that
maintains the engine speed / RPMs by adjusting the Fuel Control Actuator controlling the fuel injection
unit. The APECS microprocessor-based Controller processes the signal received from a speed sensor, in
this application a Magnetic Pick-up and compares it to the programmed settings. These setting are
maintained regardless of the load applied to the engine.
The APECS Controller is software programmable and must utilize the CALT calibration tool for
configuring and adjusting the settings. CALT is a software based calibrating and monitoring tool, which
permits the user to calibrate the controller as well as make adjustments to the program even while in
operation. CALT allows adjustments to the PID gain settings for proper tuning of an application. The
PID gains adjustments will improve response time, steady state and stability in the engines performance.
The APECS Controller retains these settings in memory during shut down periods. The settings can also
be saved to file for later viewing and printing and may be used to program another controller.
CALT can be run on an IBM compatible PC, a laptop computer is desirable for its convenience
and portability. The APECS Controller is accessed through an Interface Module, which provides a
connection to the PCs serial port with a 9 pin RS-232 cable.
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