Line Status Signal Markings; Traffic Consideration For Trolley Line Operation; Approaching Slow Moving Vehicles In A Trolley Assisted Truck - Komatsu 730E Operation & Maintenance Manual

OM3070
Operating Instructions

LINE STATUS SIGNAL MARKINGS

The line status signals will show the following colors
to indicate line status:
Ready for haul traffic - green
Not ready for haul traffic - red
Trucks operating on trolley assist may be rejected
from a trolley assist line for several reasons. They
include:
1. System current overload - The trolley system is
capable of power output to a certain rating. If
too many trucks are using a section of line at
one time, this rated power output may be
exceeded and the section of line will automati-
cally de-energize, rejecting the haulage units
operating on that section of line.
2. Overloaded truck - If a truck is overloaded, the
power required to transition to trolley assist may
be too great for the truck's electrical control sys-
tem, which would cause the truck to not accept
trolley assist or reject from trolley after the truck
is on trolley.
3. No throttle signal - If, at any time while on trolley
assist, the operator releases the throttle pedal,
the truck will reject from the line and the panto-
graph will lower immediately. The truck's electri-
cal control system will switch the truck back to
the diesel mode.
4. Electrical system malfunction - The truck is
equipped with systems that monitor the status
of the trucks trolley control system. If any abnor-
mal condition is detected in the electrical sys-
tem, the electric control system will lower the
pantograph, and switch the truck back to the
diesel mode.
If a truck is rejected while the operator has the
throttle fully depressed, the transition back to a
diesel mode will be smooth and the operator will
notice the truck speed decrease from trolley
speed to diesel speed. The truck will not stop
and the operator can proceed up the ramp. If
the operator releases the throttle pedal, the
truck will stop in either mode.
TRAFFIC CONSIDERATION FOR TROLLEY
LINE OPERATION
Trucks operating on trolley assist will travel faster
than trucks unable to operate on trolley, most support
equipment and some maintenance equipment.
Because of this speed difference, trucks operating on
trolley assist will actually be able to overtake some
slower moving vehicles if allowed. To maintain the
highest level of effectiveness and efficiency of the
trolley system, it is important that all personnel oper-
ating equipment in the pit area react properly to trol-
ley assisted haulage equipment and be aware of the
proper procedures to allow faster moving haulage
trucks to overtake the slower moving vehicles when
possible.
APPROACHING SLOW MOVING VEHICLES
IN A TROLLEY ASSISTED TRUCK
As trucks operating on trolley assist approach slower
moving vehicles, the truck operator must begin to
reduce the trolley truck speed by notching back on
the trolley control. Operators must be looking well
enough ahead to begin speed reduction before the
truck gets too close behind the slow moving vehicle
(less than 100 feet).
NOTE: Haul trucks must continue to maintain
minimum following distances between equipment or
vehicles of 100 feet uphill or on the level, and 200
feet downhill.
If a slower moving vehicle, traveling in front of a trol-
ley assisted haulage truck, does not take the
required action allowing the truck to overtake, the
truck will reduce speed adequately to maintain
proper following distances. If proper following dis-
tances cannot be maintained while operating on trol-
ley assist, and the slow moving vehicle does not, or
cannot, take the required action to allow overtaking,
the trolley assisted truck will switch back to diesel
mode, if necessary.
If the slower moving vehicle takes the necessary
action to allow the trolley assisted truck to overtake
them, the trolley assisted truck will notch forward to
obtain maximum speed and overtake the slower
moving vehicle as quickly as possible.
Operation - Section 30
Page 30-23