Traction Rolling Stock - Indian Railways Institute of Electrical ...

The opening of the HBA switched causes the relay QV-62 to drop out. The lamp LSGR is
extinguished.
5.7.3.3 OPERATION AT POSITION (+) OR (-) WITH RUNNING OR BRAKING IN MULTIPLE -
UNIT OPERATION
When (+) or (-) command is given with the master controller MP the notch to notch relay
Q52 is energized in all locomotives. The auxiliary contacts of this relay in the run of the line 080-
081 prevent the synchronous running supervisory relay Q49 from being energized.
If one of the air motors, does not follow the order, the relay Q49 on this faulty locomotive
remains energized. The relay Q52 is held on the healthy locomotives too via the control coupler
via the line run 211-085, thereby preventing further movement of the tap changer air motors.
5.7.4.4 EMERGENCY STOP (ZERO POSITION OF MASTER CONTROLLER) WITH
MULTIPLE UNIT OPERATION
In this case the synchronous running supervisory control is cut out of action, since the
zero position should be reached without interruption. The holding circuit - 87 for Q52 is interrupted
by auxiliary contacts of Q46.
Nevertheless, the relays Q49 and Q52 operate during the transition from notch to notch,
since the energized relay Q46 itself switches on Q52 which, in turn, again switches off Q49.
However, the result of closing the Q46 auxiliary contact in the line run 087 (holding
circuit) of the relay Q52 will be that, should an air motor stop before reaching the zero position,
the main circuit breaker DJ will be tripped after approx.5.5sec. via Q46/Q118. The tripping
of main circuit breakers on healthy locomotives will, however, be avoided.
Since the return to zero during regression is not synchronized, it is necessary to avoid
that the relay Q49 holds the remaining air motors via the multiple unit control lines as soon as the
first tap changer of the coupled locomotives reached the zero position.
For this purpose the contact of the auxiliary relay QV62 is inserted in the feed line of
Q49. When the particular tap changer reaches zero the relay QV62 picks up and interrupts the
energizing circuit of Q49.
5.7.5.5 ELECTRICAL AUXILIARY CONTROL OF TAP CHANGER
In the case of faults affecting the issue of orders by the master controller, emergency
electrical control (EEC) may be maintained with the aid of push buttons for notching up BPP and
for notching down BPR.
The following conditions must be satisfied for such operation:
a) Switching on of lever in switch box (BL) provided in drivers cab.
b) The master controller hand wheel must be at position "0" or "N".
c) The programme switch ZSMS on the pneumatic control panel is changed over to
position "0". A possible infeed via the master controller contacts is thus prevented
while the lines 065 and 066 are energized.
The push buttons BPP or BPR then act directly on the solenoid valves SMGR-VE1 and