Releasing Parking Brake
1.Press BPPB illuminated red button once red lamp will get extinguished and 6 kg/cm2 pressure enter in parking activators which can seen in PB gauge indicating that PB are released OR
2.Press “Release” push button on parking brake solenoid 30, BPPB red lamp will extinguished, air will be admitted in parking activator and gauge will shown 6 kg/cm2 pressure OR
3.Pull “parking brake release spindle” provided on parking brake cylinder on wheel No.2,6,7,11. (for WAP-7/WAG-9) and on wheel no. 1-4-5-8 (for WAP-5 locos.)The lock of PB will open and piston return to release position due to re-setting spring at that time. ‘KHUT” sound will be heard.
Note:
1-If PB are released through manual lever, BPPB will not extinguished in Energized loco and driver may get indication of application of PB and throttle will not respond, in such case press BPPB to release PB even though PB are released manually.
2-Ensure releasing of PB by physically shaking the brake block. 3-in dead loco if there is no air pressure even though the PB will remain in applied condition , but once the brakes get released , then PB cannot be applied again until the loco takes on pressure. So, while shunting the dead loco and stabling there after, this fact should be kept in mind and loco should be secured properly by wooden wedges as local hand brakes are not provided in the loco.
Locking Of Parking Brakes:
A) Parking brakes can be locked in applied or in release condition for this purpose locking arrangement is provided on release and application plunger of solenoid valve 30.
B) If plunger is pressed and then rotate, it will be remain in that condition until you unlock it by again rotating it and taking out the plunger out side.
C) For locking the parking brake, follow the instructions of the division if any; otherwise don’t lock the parking brakes.
Failure Of Brake Electronics:-Whenever brake control electronics get failed a priority-1 message appear on the screen with emergency brake application. One circuit breaker is also provided in SB-1, if this circuit breaker is tripped same symptoms will appear.
Regenerative Braking:-
This is an electrical braking system in which brakes are applied on loco without physical application or brake block failure.
1.Brake block does not apply on wheel so wheel and brake block wear is eliminated.
2.Reliable braking.
3.Smooth controlling.
4.Energy generated during braking is fed back to OHE i.e. it works just like a small power station and helps in energy conservation.
5.Braking is available up to 0 KMPH.
When throttle is put to BE side, traction motor work as generator and generates 3-phase, AC supply which is converted into DC supply by driver converter and fed to line Converter through DC link. In line converter this DC supply is again converted into single phase/AC supply in such a way that it induces supply equal to line voltage in main transformer through converter, which later on fed to OHE through VCB and pantograph.
At the time of Regenerative braking, the TE / BE meter deviates down ward in RB mode.
If the RB fails during braking operation the independent loco brakes automatically takes over its function in proportion to RB force through blending valve.
Even if the RB and Pn brakes applied together due to fault in the system, excessive braking of loco is avoided because the anti spin slides control system reduced the electrical braking effort.
You can use the regenerative braking from full speed to ‘0’ speed.
As train loco can be stopped only by using regenerative braking, there is a possibility of non Application of loco brakes, here one thing should be noted that loco can be stopped but cannot be held by regenerative braking. So, don’t forget to apply loco /train brakes at halt/stop.
As already explained it feeds back to OHE during regeneration, so, Use RB as more as possible and generate the energy.
Also note the readings at the time of CTO & CHO to calculate energy conservation by you
