4 Fuel Output Modes and Changeover Options
Mk8 MM Manual Page | 108
4.3 Single Fuel Output Mode (SFOM)
Single Fuel Output Mode (SFOM) is the standard (default) mode of operation for the Mk8 MM, it can be
selected by setting Option/ Parameter 131 to 0. On this mode it is possible to configure and commission 4
fuels utilising the main set of fuel outputs on the MM using changeover relays.
4.3.1 Fuel Configuration and Wiring in SFOM
In Single Fuel Output Mode, up to 4 fuels are wired to the MM’s main fuel output terminals using changeover
relays;
• All configured fuels are controlled by the same fuel channel
• Combustion air is controlled by a defined air damper channel and/or VSD channel
• All fuels use the same Proof of Closure / CPI input
Mains voltage output for valve 1 - fuel 1
Mains voltage output for valve 2 - fuel 1
Proving Circuit – Fuel 1 Proof of Closure
Mains voltage output – vent valve
Main Fuel Gas Pressure Sensor
Main Fuel Oil Pressure Sensor
4.3.2 Pressure Sensors in SFOM
The same fuel pressure sensor is used for all fuels configured in SFOM for valve proving and/or limits
testing, and it can be switched over from one fuel to another using a changeover relay. Only the fuel that is
firing is checked, the inactive fuels are not checked.
4.3.3 Commissioning in SFOM
When using SFOM any fuels used have to be commissioned in Single Fuel Output Mode, therefore fuels
commissioned in DFOM will require recommissioning.
The fuels can use the same servo channels, also it is possible to use the same servo motor to control multi-
fuels using the ‘piggyback’ valve arrangement.
4.3.4 Fuel Changeover Process in SFOM
Fuel changeover is possible in SFOM using changeover relays, when the fuel select input is changed on the
MM, this will trigger an MM shutdown and restart on the newly selected fuel. The MM will go through the
standard optioned safety checks during the process.
In SFOM, it is possible to switch between fuels at any MM phase (firing, standby, etc.).
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