TM 55-2210-224-12
2-24. GROUND RELAY ACTION
CAUTION
Repeated tripping of the ground relay, accompanied by unusual noises such as continuous
thumping or squealing, may be an indication of serious traction motor trouble that must be
investigated at once.
a.
If a ground occurs in the high-voltage circuit, the
ground relay will trip and the engine will return to
idle, and the GROUND RELAY indicating light (1)
will light.
b.
When the ground relay trips, correct the trouble
as follows:
(1)
The ground relay may be energized by
some temporary condition. Reset by
returning throttle (2) to IDLE position and
pressing
GROUND
RELAY
RESET
pushbutton (3). Normal operation may then
be resumed.
(2)
If the ground persists, stop engine and
report this condition to your supervisor.
2-25. RUNNING OVER RAILROAD CROSSOVERS
When running over crossovers, move the throttle handle to reduce speed and avoid excessive jarring of gears and
electrical pitting of commutators.
2-26. EMERGENCY APPLICATION OF BRAKES
a.
When the brakes apply automatically from the
train at an emergency rate of reduction (indicated
by the brake pipe pressure falling rapidly to zero),
place automatic brake valve handle (1) in
EMERGENCY position to prevent the escape of
main reservoir pressure, and leave it in that
position until train stops. Move throttle handle (2)
to IDLE position. Push sand control (3) until train
stops.
b.
Use independent brake valve (4) to reduce brake
cylinder pressure on the locomotive to prevent
sliding the wheels. Then use the independent
brake heavily for the last 100 feet (30.48 m) to
avoid a runout of slack as the train stops.
2-38
