Electronic Modular Control Panel II+ Paralleling (EMCP II+P) Caterpillar

AL Fault Code

Usage:

C32 SXC

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Table 1
AL Fault Code Troubleshooting
AL Fault Code	Description	Troubleshooting
AL1	High Water Temperature Alarm Coolant temperature increases to within 6°C (11°F) of setpoint P015.	Refer to the Troubleshooting, "Troubleshooting Dedicated Shutdown Indicators".
AL2	Low Engine Coolant Temperature Alarm Coolant temperature decreases to setpoint P016.	Refer to the Troubleshooting, "Troubleshooting Dedicated Shutdown Indicators".
AL3	Low Engine Oil Pressure Alarm Oil pressure drops to within 34 kPa (5 psi) of the P013 or P014 setpoint.	Refer to the Troubleshooting, "Troubleshooting Dedicated Shutdown Indicators".
AL4	Fault Detected By Engine ECM The engine ECM detects an alarm fault or a shutdown fault.	Refer to the appropriate engine troubleshooting service manual.
AL5	Low Engine Coolant Level Fault Coolant level drops below the probe of the coolant loss sensor.	Check level of engine coolant. The level of engine coolant must be above the probe of the sensor. Check for CID 111 faults. Perform the electrical connector inspection test. Refer to the Testing and Adjusting, "Electrical Connector - Inspect".
AL6	High Engine Oil Temp Fault Oil temperature increases to within 6°C (11°F) of setpoint P026.	Check level of engine coolant. The level of engine coolant must be above the probe of sensor. Check fan belt, etc. Check P026 setpoint.
AL7	Generator Overvoltage Fault Line to line voltages rises above the P102 or P105 setpoints.	Refer to the service manual for the voltage regulator that is being used. Check P101 through P106 setpoints.
AL8	Generator Undervoltage Fault Line to line voltage drops below the P108 or the P111 setpoints.	Refer to the service manual for the voltage regulator that is being used. Check P107 through P112 setpoints. Refer to the engine service manual for the cause of low engine speed. If engine speed is reduced and the engine control switch (ECS) is NOT in STOP, the GSC+P will issue this fault.
AL9	Generator Overfrequency Fault Frequency rises above the P114 or P117 setpoints.	Refer to the Troubleshooting, "Indicator For Engine Overspeed". Check setpoints P113 through P118.
AL10	Generator Underfrequency Fault Frequency drops below the P120 or P123 setpoints.	Refer to the engine service manual for a cause of low engine speed. If engine speed is reduced and the ECS is NOT in STOP, the GSC+P will issue this fault. Check setpoints P119 through P124.
AL11	Generator Reverse Power Fault Reverse power rises above the P126 setpoint.	Refer to the engine service manual for a cause of lost engine power. Check setpoints P125 through P127.
AL12	Generator Phase Overcurrent Fault Phase current rises above the P129 or P134 setpoints.	Check for a cause of the overcurrent. Check setpoint P029 and setpoints P128 through P135.
AL13	Generator Total Overcurrent Fault Total current rises above the P131 or P136 setpoints.	Check for a cause of the overcurrent. Check setpoint P029 and setpoints P128 through P137.
AL14	Phase A No Voltage Input Fault Phase A voltage not being received at GSC+P input.	Check for an open circuit on the wire that is connected to the GSC+P connector pin 10. Check for a short on the wire that is connected to the GSC+P connector pin 10. Refer to the Testing And Adjusting, "Schematics and Wiring Diagrams".
AL15	GSC+P Configuration Error Frequency of generator output voltage does not match engine speed.	Check setpoints P009 and P033. Setpoint P009 represents the number of ring gear teeth. Setpoint P033 represents the number of generator poles. Correct the setpoint value, if necessary.
Additional AL Fault Codes (for GSC+P)
AL16	Incorrect Phase Sequence The generator and the bus have a phase mismatch.	Check for the cause of the phase sequence mismatch. Check wiring to the bus transformer box (BTB +) and the AC transformer box (ATB +).
AL17	Improper generator or bus voltage The generator voltage or the bus voltage are either too low or the voltages do not match.	1. The generator voltage and the bus voltage must be above 10% of the nameplate voltage in P028 when setpoint P020 is set to 700. Generator voltage and bus voltage must be above 50% of the nameplate voltage in P028 when setpoint P020 is set to any other value than 700. 2. Check Setpoints P303 and P304 in order to determine whether the generator voltage and the bus voltage match within the tolerance that is specified.
AL18	Synchronizer Time-Out [CTE_CURSOR]The GSC+P is unable to complete automatic synchronization or dead bus paralleling within the time allowed in P314.	Check for cause of synchronization time-out. Ensure that the engine is responding properly to the GSC+P Speed Adjust 1 Output signal. Check for wiring errors. Check setpoints P313 and P314 for proper values. Increase the values, if necessary.

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Illustration 1	g00442245
Upper Display With AL Fault Code AL3 Showing

AL Fault Codes are shown as "AL1" through "AL15" on the upper display. The fault codes include specific engine fault conditions. An example of a specific engine fault condition is the low engine oil pressure alarm. An example of a protective relaying function is the underfrequency fault.

AL fault codes depend on certain setpoints. For more information on setpoints, refer to the Systems Operation, "Service Mode". AL fault codes are not diagnosed by the GSC+P. These codes are not stored in the fault log. Many of the AL fault codes are programmable as a fault alarm or as a fault shutdown. The AL fault codes are accompanied by either the fault alarm indicator or the fault shutdown indicator on the GSC+P in order to show the severity of the fault.