06/25/19
Message Overview:
Fault Message:
GEN1 LINE CT OPEN/SHORT FAULT
Fault Code:
2421123LPS
Associated CAS:
| Reporting LRU: | Variable Frequency Generator (VFG) 1 |
| System Description: | 24-21-00 |
| Schematic Diagram: | 24-21-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 24-21-01 [ Global Express ] [ G5000 ] [ Global XRS ] |
Fault Description:
Variable Frequency Generator (VFG) 1 has tripped off-line or will not come on-line.
Possible Causes:
- Generator Control Unit (GCU) 1 (A56)
- Variable Frequency Generator (VFG) 1 (G1)
- Line Current Transformer Assembly (LCTA)
- AC Power Center (ACPC) (A54)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
A GCU patch cable (GSE REF # 24X-24-02) can be used to swap GCUs 1, 4 and 5 into position 2 or 3 (for troubleshooting only). The GCU NVMs can only be downloaded at position #2 or #3.
Quick Links:
| Removal of the Generator Control Units (GCU) | AMM 24-24-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Generator Control Units (GCU) | AMM 24-24-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the AC Power Center (ACPC) | AMM 24-51-00-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the AC Power Center (ACPC) | AMM 24-51-00-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the AC Power Center (ACPC) Line Current Transformers | AMM 24-51-49-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the AC Power Center (ACPC) Line Current Transformers | AMM 24-51-49-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- Swap the GCU #1 with GCU #2 (physically or using the GCU patch cable).
NOTE: Use PMAT to monitor the fault on GCU.- If system checks are good, replace GCU #1 and do close out.
- If fault remains, continue with next step.
- Disconnect connector PL1 on LCTA 1 and perform a continuity check (open circuit = failure) on LCTA1 as follows:
From To Result PL1-1 PL1-4 PL1-2 PL1-4 PL1-3 PL1-4 - If there is continuity, go to step 4.
- If there is no continuity, continue with next step.
- Replace LCTA1.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Disconnect connector A56P2 (GCU 1) and perform a continuity check between GCU1 connector A56P2 and LCTA1 connector PL1 as follows:
From To Result A56P2-62 PL1-4 A56P2-63 PL1-3 A56P2-57 PL1-2 A56P2-49 PL1-1 - If there is continuity, go to step 6.
- If there is no continuity, continue with next step.
- Disconnect connector A54P6 (ACPC) and perform a continuity check (open circuit = failure) between GCU1 connector A56P2 and ACPC connector A54P6 as follows:
From To Result A56P2-62 A54P6-H A56P2-63 A54P6-G A56P2-57 A54P6-F A56P2-49 A54P6-E - If there is continuity, go to step 7.
- If there is no continuity, repair defective wiring and do close out.
NOTE: Call Bombardier for decision to repair ACPC wiring or replace ACPC.
- Disconnect connector A54P6 (ACPC) and leave PL1 disconnected. Perform a wiring check (short circuit = failure) at connector A54P6 between pins H, G, F and E.
- If wiring checks are good, continue with next step.
- If wiring checks are not good, repair defective wiring and do close out.
- Replace ACPC.
- Do close out.