17 Fully Metered Combustion Control
Mk8 MM Manual Page | 308
17.5 Faults
The table below show the faults which are directly related to the fully metered combustion control function.
Alarm/Warning –
exp. option 152
Less than 3mA signal received from fuel flow
meter
•
Check wiring and screen on terminal MF and F-
• Warning if expansion option 152 is set to 1 and MM will use the commissioned value without any fuel
or air servomotor adjustment
Alarm/Warning –
exp. option 152
Less than 3mA signal received from air flow
meter
• Check wiring and screen on terminal EX+ and EX-
• Warning if expansion option 152 is set to 1 and MM will use the commissioned value without any fuel
or air servomotor adjustment)
Fuel Temperature Sensor
Fault (T2)
Fault or no comms with T2 sensor
• Warning - MM will use commissioned temperature
• Check wiring and screen on terminals – and T2
Air Temp Sensor Fault (T3)
Fault or no comms with T3 sensor
• Warning - MM will use commissioned temperature
• Check wiring and screen on terminals – and T3
Fuel Pressure Sensor Fault
Fault or no comms with fuel pressure sensor
• Check wiring and screen on terminals 31 – 34
• If warning generate, MM will use commissioned value
• Lockout if option/parameters 125/126/127/128 is set for VPS high/low pressure limits in flame
Warning/Lockout
– option 148
Air Pressure Sensor Fault
Fault or no comms with air pressure sensor
• Check wiring and screen on terminals 31 – 34
• Lockout if option 148 is set for air pressure sensor in flame safeguard
Alarm/Warning –
exp. option 151
Fully Metered Air Adjustment
Failure
Air adjustment has reached limit and fuel-air
ratio still not met
• Check for changes affecting combustion including fuel/air pressure, temperature etc.
• Warning if expansion option 151 is set to 1
• Warning and air adjustment is disabled if expansion option 151 is set to 2
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