Operation B – Part II
ABONRMAL SIGN:
DJ tripping immediately on releasing BLRDJ
CAUSES:
1. Defective Q30. 2. Less OHE voltage. (Below 17.5 KV)
Troubleshooting
a) Close DJ and hold BLRDJ, observe UA meter, if it is below 17.5KV inform TLC. If OHE voltage is above 17.5 KV and DJ holds for more than 10 sec release BLRDJ, if DJ trips it indicates defective Q30.
b) Stop and secure the train. Lower pantograph, switch off HBA and Loop wire no. 700 and 717 on back of Q30 relay in non-modified cab, close DJ and resume traction duly watching UA meter and open DJ, when UA meter needle drops below 17.5 KV or on hearing decreasing sound of auxiliary motors.
c) If it is not possible to loop wire 700 and 717, remove Q30 from its socket and wedge Q45 in energized condition and work onwards and follow the precautions.
Q45 wedging precautions
Q45 to be wedged only after removing Q30 relay Do not wedge Q45 when A ending trouble exists
1. Ensure GR is on 0 before closing DJ.
2. DJ will close as soon as BLDJ is closed. So whenever DJ trips immediately open BLDJ.
3. At neutral section close BLDJ at DJ closing board only.
4. After closing DJ, ensure OHE voltage is above 17.5 KV. If it drops below 17.5Kv, open DJ immediately.
5. Check the working of MVSI-1 & MVSI-2 frequently on run.
6. Do not use RB.(If RB is applied BP pressure will drop through IP valve)
7. Make entry in the log book if Q30 is removed and inform TLC.
NOTE: a) After switching on HBA, Q118 and Q44 will chatter. Press BLDJ to close DJ. After DJ is closed, chattering will stop.
ABONRMAL SIGN:
DJ tripping immediately on releasing BLRDJ
CAUSES:
1. Defective Q30. 2. Less OHE voltage. (Below 17.5 KV)
Troubleshooting
a) Close DJ and hold BLRDJ, observe UA meter, if it is below 17.5KV inform TLC. If OHE voltage is above 17.5 KV and DJ holds for more than 10 sec release BLRDJ, if DJ trips it indicates defective Q30.
b) Stop and secure the train. Lower pantograph, switch off HBA and Loop wire no. 700 and 717 on back of Q30 relay in non-modified cab, close DJ and resume traction duly watching UA meter and open DJ, when UA meter needle drops below 17.5 KV or on hearing decreasing sound of auxiliary motors.
c) If it is not possible to loop wire 700 and 717, remove Q30 from its socket and wedge Q45 in energized condition and work onwards and follow the precautions.
Q45 wedging precautions
Q45 to be wedged only after removing Q30 relay Do not wedge Q45 when A ending trouble exists
1. Ensure GR is on 0 before closing DJ.
2. DJ will close as soon as BLDJ is closed. So whenever DJ trips immediately open BLDJ.
3. At neutral section close BLDJ at DJ closing board only.
4. After closing DJ, ensure OHE voltage is above 17.5 KV. If it drops below 17.5Kv, open DJ immediately.
5. Check the working of MVSI-1 & MVSI-2 frequently on run.
6. Do not use RB.(If RB is applied BP pressure will drop through IP valve)
7. Make entry in the log book if Q30 is removed and inform TLC.
NOTE: a) After switching on HBA, Q118 and Q44 will chatter. Press BLDJ to close DJ. After DJ is closed, chattering will stop.
