The Altronic EPC-50 is an air/fuel ratio controller designed for use on low-horsepower, carbureted natural gas-fueled engines. It employs microprocessor technology, allowing for a high level of sophistication in control strategy, ease of configuration and diagnostic capability. The EPC-50 and associated small engine-specific control valves are designed for use on engines operating at or near a stoichiometric air/fuel ratio and is ideally suited for application with 3-way catalytic converters. While it is designed to be mounted in the engine/compressor control panel, a NEMA 3R housing (720004-1) is also available as an alternative mounting option. The single control output of the EPC-50 allows for its use on any engine application incorporating a single fuel gas regulator. An oxygen sensor is used in the exhaust stream to sense O2 content, and a thermocouple input signals when proper exhaust temperature has been reached to allow for accurate sensor operation. A system fuel control valve installed in the fuel line to the carburetor is precisely adjusted by a stepper-motor under microprocessor control to maintain the correct O2 content in the exhaust. The desired air/fuel ratio can be easily adjusted by changing the control target voltages through the sealed membrane keypad or through the use of a PC. The EPC-50 also incorporates a thermocouple input and a dedicated output for implementation of catalyst overtemperature protection. A second digital output is available for use as an alarm for diagnostics or uncontrolled operation. The EPC-50 has an alphanumeric LCD display showing the target voltage, sensor voltage, operating temperature, stepper motor position and diagnostic information. Power requirement is 24 (12–30) VDC, 1 amp. In remote areas, power can be provided by the Altronic 24VDC Alternator Power Package. Refer to Altronic Form ALT.
n Designed specifically for use on low-horsepower stoichiometric natural gas-fueled engines
Accurate closed-loop control of air/fuel ratio for minimum engine emissions
Precise full authority actuation using digitallycontrolled valves for positive fuel control
Modbus-based EPC terminal program and expanded I/O available to implement advanced control strategies
Fully supports Modbus RTU communications with included PC monitoring software
CSA certified for use in Class I, Division 2, Groups C and D hazardous areas