08/21/20
Message Overview:
Fault Message:
ESS TRU 2 FAN FAILED
Fault Code:
2460472DCP
Associated CAS:
| Reporting LRU: | DC Power Center (DCPC) |
| System Description: | 24-31-00 |
| Schematic Diagram: | 24-31-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 24-31-01 [ Global Express ] [ G5000 ] [ Global XRS ] |
Fault Description:
The Essential Transformer Rectifier Unit (ESS TRU) 2 Fan Speed Sensor is low or no fan output to the DC Power Center (DCPC).
Possible Causes:
- Essential Transformer Rectifier Unit (ESS TRU) 2 (A76)
- DC Power Quality Monitor (DCPQM) 2
- DC Power Center (DCPC) (A63)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
NOTE: The ESS TRU 2 fan fail will show on the DC synoptic page, as the ESS TRU 2 outline will be amber and the TRU output voltage is approximately 28 VDC.
NOTE: If the TRU voltage displayed on the DC synoptic page is different than 28 VDC, check that all three 115 VAC input phases are present. A missing phase could result in the fan not spinning.
Quick Links:
| Removal of the Transformer Rectifier Units | AMM 24-31-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Transformer Rectifier Units | AMM 24-31-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the DC Power Center (DCPC) | AMM 24-61-00-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the DC Power Center (DCPC) | AMM 24-61-00-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the DC Power Center (DCPC) DC Power Quality Monitor | AMM 24-61-13-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the DC Power Center (DCPC) DC Power Quality Monitor | AMM 24-61-13-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Access to Active Faults | AMM 45-45-00-970-802 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Access to Stored Faults | AMM 45-45-00-970-803 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- Get Access to the FWD bay to check for the airflow of the ESS TRU 2 and confirm if the fan is rotating or not.
- If the fan is not rotating, replace ESS TRU 2 and do close out.
- If the fan is rotating, continue with next step.
- Swap ESS TRU 2 with another TRU.
- If system checks are good, replace the ESS TRU 2 and do close out.
- If fault remains, continue with next step.
- Disconnect ESS TRU 2 connector A76P1 and DCPC connector A63P2. Perform a continuity check as follows:
From To Result A76P1-D Ground - If there is continuity, repair defective wiring as required and do close out.
- If there is no continuity, continue with next step.
- Perform a continuity check as follows:
From To Result A76P1-D A63P2-C - If there is no continuity, repair defective wiring as required and do close out.
- If there is continuity, continue with next step.
- Access the DCPC Logic assembly and remove the DCPQM 2 card. Perform a continuity check as follows:
From To Result A63P2-C Ground - If there is continuity, replace DCPC and do close out.
- If there is no continuity, continue with next step.
- Perform a continuity check as follows:
From To Result A63P2-C P221A-11 - If there is no continuity, replace DCPC and do close out.
- If there is continuity, continue with next step.
- Replace the DCPQM 2 card.
- Do close out.
