SENSOR-SPEED 3193252 - Caterpillar

Set Points 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.Note: Some of the items that are listed in Table 1 are optional.
Table 1
Alarms and Shutoffs for 3600 Engines (Distillate Fuel)    
Condition    Parameter    Application    Setpoint for Alarm    Setpoint for Shutoff    
Cooling    
High     Aftercooler and oil cooler water temperature (inlet)     50 °C (122 °F) temperature regulator    
60 °C (140 °F)    
67 °C (153 °F)    
High    
50 °C (122 °F) temperature regulator in high ambient temperature conditions
66 °C (151 °F)    
69 °C (156 °F)    
High    
32 °C (90 °F) temperature regulator
39 °C (102 °F)    
42 °C (108 °F)    
Low     Aftercooler and oil cooler water pump pressure (outlet)