2. TROUBLESHOOTING OF WAG5, WAG7, WAP4, WAM4 &WAP1
2.1 General checking in case of DJ trips on line
If DJ trips on line with sudden drop of BP pressure, switch ON Flasher light immediately and act as per G&SR and do the following.
1. Bring MP to 0.
2. Open all BL switches.
3. Wait for LSGR to glow. If it does not glow, wait for 15 seconds, if still not glowing check pantograph, if pantograph is lowered, troubleshoot for CCPT melting. If pantograph is in raised condition, bring GR to zero manually.
4. Watch LSSIT in case of SIV locos, if it glows troubleshoot for it. Even if LSSIT not glowing check for any fault lamp glowing in SIV panel (INT/EXT fault lamp)
5. Ensure air pressure in PR is above 6.5 Kg/cm².
6. Ensure battery voltage is above 85V in ARNO and 90 volts for SIV/FDCS locos.
7. Ensure all EM contactors are opened fully.
8. Check QLM first and other safety relays.(Locked indication for QLM)
If safety relay target dropped, troubleshoot for DJ TRIPPING THROUGH SAFETY RELAYS
If everything is found normal, try to reclose DJ and pick up the correct abnormal sign for the following failures and troubleshoot.
1. Impossibility to close DJ (ICDJ)
2. No Tension
3. Operation A Ending (ARNO locos only)
4. Operation B - Part II
5. Operation B - Part I
6. Operation O
7. Operation I
8. Operation II
9. DJ tripping without any apparent cause (TWAC)
2.1 General checking in case of DJ trips on line
If DJ trips on line with sudden drop of BP pressure, switch ON Flasher light immediately and act as per G&SR and do the following.
1. Bring MP to 0.
2. Open all BL switches.
3. Wait for LSGR to glow. If it does not glow, wait for 15 seconds, if still not glowing check pantograph, if pantograph is lowered, troubleshoot for CCPT melting. If pantograph is in raised condition, bring GR to zero manually.
4. Watch LSSIT in case of SIV locos, if it glows troubleshoot for it. Even if LSSIT not glowing check for any fault lamp glowing in SIV panel (INT/EXT fault lamp)
5. Ensure air pressure in PR is above 6.5 Kg/cm².
6. Ensure battery voltage is above 85V in ARNO and 90 volts for SIV/FDCS locos.
7. Ensure all EM contactors are opened fully.
8. Check QLM first and other safety relays.(Locked indication for QLM)
If safety relay target dropped, troubleshoot for DJ TRIPPING THROUGH SAFETY RELAYS
If everything is found normal, try to reclose DJ and pick up the correct abnormal sign for the following failures and troubleshoot.
1. Impossibility to close DJ (ICDJ)
2. No Tension
3. Operation A Ending (ARNO locos only)
4. Operation B - Part II
5. Operation B - Part I
6. Operation O
7. Operation I
8. Operation II
9. DJ tripping without any apparent cause (TWAC)
NOTE: 1. Safety relays may act at any stage. So before confirming the above failures ensure safety relays and its targets are normal. 2. No tension may be experienced at any stage even during trouble shooting for other failures. Do not panic. 3. Before troubleshooting, ensure PR pressure, if required switch ON, ZCPA. 4. Do not leave the train with loco brake (SA-9) alone. After stopping the train, both loco and train brake should be applied by automatic brake valve (A-9).
