C280-12 Marine Engine Alarms and Shutoffs Caterpillar

Alarms and Shutoffs
C280-12 Marine Engine [SEBU9221]
C280-12 Marine Engine Alarms and Shutoffs
1.1. Setpoints for Alarms and Shutoffs
2.1. Aftertreatment Emission Fault Codes

Setpoints for Alarms and Shutoffs

Alarms and shutoffs are activated by critical operating temperatures, pressures, levels, or speeds.

Engines are equipped with alarms in order to alert the operator if undesirable operating conditions occur. When an alarm is activated, corrective measures must be made before damage to the engine can occur.

Shutoffs are set at more critical operating setpoints than alarms. Any problem that causes the engine to shut off must be corrected before the engine is restarted.

Table 1 lists the alarms and shutoffs that are available and the corresponding suggested setpoints. Some of the conditions that cause an alarm will also cause the engine to be derated.

When the "SHUTDOWN PRTN OVERRIDE" switch is in the ON position, no shutoff or derate will occur unless one of the following conditions occurs:

  • An overspeed condition exists

  • The "EMERGENCY STOP" switch is activated.

Note: Some of the items that are listed in Table 1 are optional.

Table 1
Alarms and Shutoffs for C280-12 Engines 
Condition  Parameter  Application (1)  Setpoint for Alarm (Alarm Default State)  Setpoint for Derate (Derate Default State)  Setpoint for Shutoff (Shutdown Default State) 
High  Engine Coolant Temperature    103° C (217° F) ALWAYS ON(2)  106° C (223° F) - ON  109° C (228° F) - ON 
Low  Engine Coolant Inlet Pressure    Map - ON 
Low  Engine Coolant Level    Switch - ON 
High  Aftercooler Coolant Temperature  C280-12 Marine Auxiliary or DEP  45° C (113° F) - ON  48° C (118° F) - ON  61° C (142° F) - OFF 
C280-12 Marine Propulsion 39° C (102° F) - ON  42° C (108° F) - ON  55° C (131° F) - OFF 
Low  Aftercooler Coolant Pressure    Map - On 
High  Turbine Inlet Temperature    630° C (1166° F) - ON  631° C (1168° F) - ON  660° C (1220° F) - ON 
High  Turbine Inlet Temperature Differential    100° C (212° F) - ON 
High  Exhaust Port Temperature (1-20)    580° C (1076° F) - ON  600° C (1112° F) - OFF 
High  Exhaust Port Temperature Deviation (1-20)    75° C (167° F) - ON  125° C (257° F) - OFF 
Low  Exhaust Port Temperature Deviation (1-20)    125° C (257° F) - ON  200° C (392° F) - OFF 
High  Turbine Shaft Speed    30,000 RPM - ALWAYS - ON (2)  30,100 RPM - ON   31,000 RPM - ON 
High  Turbine Shaft Speed Differential  C280-12 Engines with Wastegates  12 percent - ON (3)     
High  Fuel Filter Restriction    75 kPa (11 psi) - ON 
Low  Fuel Pressure    Map - ON 
Inlet Air 
High  Intake Manifold Air Temperature    61° C (142° F) - ALWAYS ON (2)  62° C (144° F) - ON  71° C (160° F) - OFF 
High  Crankcase Pressure    0.6 kPa (0.09 psi) - ON   1 kPa (0.15 psi) - ON 
High  Engine Oil Temperature    92° C (198° F) - ALWAYS ON (2)  92° C (198° F) - ON  98° C (208° F) - ON 
Low  Engine Oil Pressure    Map - ALWAYS ON (2)  Map - ON 
High  Engine Oil Filter Restriction    70 kPa (10 psi) - ON 
(1) Empty cell implies setting is applicable to both engines
(2) Not Configurable
(3) Enabled at Turbo Speeds Greater than 15,000 RPM.

Aftertreatment Emission Fault Codes

A recorder that has been installed in the engine control panel will record critical emission codes. These codes are required by the EPA. The operator will have up to 30 days to notify the EPA of all fault code events. Consult with your Cat dealer for additional information concerning fault codes.

As an owner/operator of a Tier4 engine system, you are required to report to the EPA within 30 days if any of the codes listed below are recorded. As the manufacture of major components in the engine system, AVSpare has installed an A5N2 recorder in the L2 and L3 engine panels. You will be allowed access to the recorder by using a standard ether net cable. An explanation will be required by the EPA on why, when, and what caused the system to record one of the codes listed below. The codes listed below are codes that result in incorrect operation and/or a low DEF level in the DEF tank. If the complete engine system is maintained correctly and proper fluids used, the codes listed below will not be recorded.

  • 3516-17 Aftertreatment exhaust flow

  • 4360-16 Aftertreatment exhaust temperature medium severity

  • 3360-2 Aftertreatment dosing pump emergency switched turned off

Each engine control panel will have a recorder installed. If your vessel has more than one engine installed, you will need to ensure that all engine systems are functioning as designed. The AVSpare engine system will record many more faults/events codes that can be used to help troubleshoot the system if something is not working correctly. Your Cat dealer will be able to help you troubleshoot and understand engine and aftertreatment codes.

Table 2
Setpoints for Aftertreatment 
Condition  Parameter  Application  Alarm Setpoint (Default)  Derate Setpoint (Default)  Shutoff Setpoint (Default) 
High(1)  SCR Inlet Temperature    500° C (932° F)     
High(2)  SCR Inlet Temperature    525° C (977° F)     
High(3)  SCR Inlet Temperature    575° C (1067° F)     
Low  SCR Inlet Temperature    Map - On     
High(1)  SCR Outlet Temperature    Map - On     
High(2)  SCR Outlet Temperature    Map - On     
High(3)  SCR Outlet Temperature    Map - On     
Low  SCR Outlet Temperature    Map - On     
High  DEF Pressure    Map - On     
Low  DEF Pressure    Map - On     
High  DEF Dosing Air Pressure    450 kPa (65.3 psi)     
Low(1)  DEF Dosing Air Pressure    400 kPa (58 psi)     
Low(2)  DEF Dosing Air Pressure    275 kPa (40 psi)     
High  DEF Concentration    Map - On     
Low  DEF Concentration    Map - On     
High  DEF Manifold Temperature    50° C (122° F)     
Low(1)  DEF Manifold Temperature    −5° C (23° F)     
Low(2)  DEF Manifold Temperature    −10° C (14° F)     
High  CEM Inlet Air Pressure    Map - On     
Low  CEM Inlet Air Pressure    Map - On     
Low(1)  DEF Buffer Tank Level    14 percent     
Low(2)  DEF Buffer Tank Level    7 percent     
Low(3)  DEF Buffer Tank Level    0 percent     
High  DEF Bulk Tank Level Switch    Closed     
Low  DEF Bulk Tank Level Switch    Closed     
High  NOx Conversion    Map - On     
Low  NOx Conversion    Map - On     
Low(1)  Tank Temperature    −6° C (21.2° F)     
Low(2)  Tank Temperature    −8° C (17.6° F)     
Low(3)  Tank Temperature    −9° C (16° F)     
High  Tank Temperature    50° C (122° F)     
(1) Low
(2) Medium
(3) High