MTU 12 V 2000 P12 Operating Instructions Manual page 29

Override (safety system bypass)
The "Override" feature is used to bypass safety functions tripped by limit value violations or sensor faults
and to bypass start interlocks.
Operating states which would normally lead to engine shutdown are ignored when the "Override" function
is activated. The following operating states can also be configured to shut the engine down in override
mode:
• Coolant level
• Coolant temperature
• Coolant pressure
• Charge air coolant level
• Lube oil pressure
• Lube oil temperature
Monitoring functions
The engine management system for engines used in Oil&Gas applications fulfills the following monitoring
tasks:
• Control of analog instruments;
• engine speed (default)
• engine lube oil pressure (default)
• engine lube oil temperature (default)
• engine coolant temperature (default)
• Transmission of all measurands, warnings and alarms to monitoring system via CAN bus.
• Automatic shutdown in case of limit value violations.
Refer to the measuring-point list for order-specific configuration data.
Engine monitoring can basically be divided into two different areas:
• Engine protection system, monitors the engine during operation,
• Safety system, generates automatic engine shutdown in case of limit value violation.
These two functional areas are constantly monitored by the internal "Integral Test System (ITS)" to en‐
sure operational availability.
Engine protection system
The engine governor incorporates an integral engine protection system. It monitors the operational data
of the engine.
Tasks of the engine protection system are:
• Safeguarding the engine from critical operating states.
• Signaling alarms to operating personnel.
• Restricting engine operation to remain within admissible operating values.
Action is taken such as warning, start interlock, power reduction or engine shutdown by reducing the
quantity of fuel injected depending on the values measured.
Closed-loop control functions
Closed-loop engine control functions:
• Speed
• Injection control with mapped commencement of injection.
• Two adjustable speed droops.
• Desired speed via:
• Analog or binary speed setting on the CAN bus.
• Analog speed setting 0 V to 10 VDC / 0 V to 5 VDC / 4 mA to 20 mA.
• Binary speed setting via Up/Down signal, frequency CAN bus.
• Frequency speed setting.
• Acquisition of a load pulse signal (analog or CAN bus) in preparation for load application.
• HP fuel governor.
MS150025/02E 2012-10 | General Information | 29