SCREW AS 1043039 - Caterpillar

The alarm mode alerts the operator when an alarm fault is occurring. An alarm fault is not critical but an alarm fault is potentially serious. An alarm fault precedes certain dedicated shutdown faults. An alarm fault can be protective relaying functions that have been enabled as an alarm fault.When an alarm fault exists the GSC automatically activates alarm mode. The operator is alerted by the FLASHING fault alarm indicator. Press the "ALARM CODES" key in order to identify the alarm fault. A corresponding fault code is then shown on the upper display. This fault code can be an AL fault code, a SP fault code or a diagnostic fault code. For more information on fault codes, see System Operation, "Fault Description". When the GSC is in alarm mode, the engine is able to start or the engine is able to run.The AL fault codes that are shown on the GSC indicate the current status of the generator set. The GSC does not show the AL fault codes after the fault has been corrected. Diagnostic codes are logged in the GSC fault log for viewing by service personnel.Note: When the operator overrides a shutdown fault to be an alarm fault, the corresponding dedicated fault shutdown indicator is on continuously. The fault shutdown indicator stays on continuously if the particular fault occurs. When the fault shutdown indicator is ON CONTINUOUSLY, the normal shutdown response has been overridden by the operator. The shutdown fault is treated as an alarm fault. For the shutdown faults that are overridden, a fault code is not shown on the upper display. The dedicated shutdown indicator remains ON CONTINUOUSLY until the fault is corrected and the engine control switch (ECS) is turned to the "OFF/RESET" position. The dedicated shutdown faults that can be overridden are low oil pressure and high coolant temperature. See Systems Operation, "Setpoint Programming OP5 (P03)". For more information, see System Operation, "Shutdown Mode".Alarm faults do not have an immediate adverse effect on the generator set. However, the operator should investigate the cause of the alarm fault condition at the earliest opportunity. If the operation of the generator set is mandatory then the procedure to start and stop is identical to normal mode. The GSC will respond to the operator input that is from the instrument panel and the engine sensors.Alarm Mode Sequence
An alarm fault occurs.
The GSC detects the alarm fault and the GSC FLASHES the fault alarm indicator. The GSC does not change the status or operation of the generator set.
Pressing the "ALARM CODES" key causes the upper display to show a corresponding fault code.
Correct the alarm fault. See Testing And Adjusting, "Fault Identification".
After the alarm fault has been corrected, the GSC turns OFF the fault alarm indicator and the GSC removes the fault code from the upper display. The GSC now returns to normal mode.