Getting Off Line; Line Status Signals - Komatsu 730E Operation & Maintenance Manual

Operation - Section 30
Page 30-22

GETTING OFF LINE

As the truck approaches the end of the trolley line, it
must exit the line properly. There will be signs or sig-
nals near the end of the line indicating to the operator
to exit the trolley lines. The operator must lower the
pantograph which drops out the trolley, and the truck
will go back to diesel. This is done by moving the
master control lever rearward to the straight up, DIE-
SEL position. This will start the drop out sequence.
NOTE: Following this procedure will cause the trolley
power and the ready for trolley lights to turn off.
The overhead cables taper upward as the truck
approaches the end of the line. If the proper drop out
sequence is not started the truck will drive out from
under the cables with the pantograph still up. This
will cause damage to the pantograph because of the
arcing that will occur.
In the event an operator is required to get off of a trol-
ley line to drive around an obstruction, such as rocks
or disabled equipment, the operator will follow the
procedure for getting off line, drive around the obsta-
cle and follow the procedure for getting on line.
DO NOT trolley assist lines unless the system
has been de-energized and grounded by qualified
electricians.
Only persons who have been properly trained
and are qualified to perform the lock-out and
grounding will be authorized to isolate the line or
lines. Such authorization will be made in writing
by the electrical engineering or electrical mainte-
nance departments.

LINE STATUS SIGNALS

Line status signals are lights (much like traffic lights)
that advise operators whether segments of trolley
lines are energized and ready to accept haulage traf-
fic. A different status signal light is used for each sec-
tion of the trolley line that is energized.
The lights are mounted to allow the driver to check
the status of the line that the truck is approaching, so
the pantograph can be lowered before that section of
line is reached if the line is not able to accept haul-
age trucks. Each ramp that is trolley equipped may
have several different sections of energized trolley
lines that make up the trolley line for the entire ramp.
Each section of line that is energized will have a sep-
arate line status signal.
Since it is important that a driver lower the panto-
graph before the truck reaches a de-energized sec-
tion of ramp, the drivers must constantly monitor the
line status signals and lower the pantograph if the
line status signals indicate that an approaching sec-
tion of line is not ready to accept haulage trucks.
If an operator approaches a line status signal that is
flashing red, indicating the line is not ready to accept
haulage traffic, the driver will lower the pantograph
before reaching that section of line. After proceeding
past the section of line and the next line status signal
indicates the next section of line is ready to accept
haulage traffic, the operator will re-engage the trolley
line as previously instructed and continue on trolley
assist.
OM3070
Operating Instructions