• Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!

Komatsu 830E

H

Hank R

Senior Member
Joined
May 28, 2014
Messages
2,068
Location
Princeton B.C. Canada
Occupation
Retired Truck driver and School bus driver
digger doug said:
It does appear the pantograph is down.
Enlarging the pix, looks like their is a smaller wire that is in contact.
The large wires appear to be too high for the pantograph to reach, even if they extend
the pantograph some more.

BTW what is the large red digit display facing the camera, opposite the operators cab ? it appears to be reading "210"
Click to expand...

I did check it out on the copper Mt stack stuff and there is a video there showing this truck passing another haul truck at twice the speed. The big wire we see in the picture is the big supply line not the trolley wires. this trolley system has cut 3 minutes off the trip coming out of the pit and fuel saving is huge.. Hope to figure out how to post the video.
 
John C.

John C.

Senior Member
Joined
Jun 11, 2007
Messages
12,870
Location
Northwest
Occupation
Machinery & Equipment Appraiser
Worked perfectly for me. Thanks for posting!
 
Nige

Nige

Senior Member
Joined
Jun 22, 2011
Messages
29,228
Location
G..G..G..Granville.........!! Fetch your cloth.
digger doug said:
Are they also using it for going downhill ?
Click to expand...
Only installed on the uphill run according to ABB's promo video. See @ 0:29. Interestingly they have a right-side traffic system which is unusual. Most mines haul truck systems drive on the left.
IIRC there are major engineering challenges in backfeeding power into a trolley system, even for trucks equipped with AC drives.

 
D

digger doug

Senior Member
Joined
Nov 2, 2011
Messages
1,416
Location
NW Pennsylvania
Occupation
Thrash-A-Matic designer
You-would-tink .... that with the inverter A.C. drives that regen back into the catenary would be "Easy Peasy".

FWIU, regen just goes to the grid resistors, but I don't know if it's A.C. or D.C.

And if it's A.C. it's not going to be anywhere close to the grid frequency.

So I think regen would involve another set of rectifiers to make D.C. from the drive's regen circuit, and then a set of "grid tie inverters".

However, I just noticed the over head wires are qty (2).
Is the catenary D.C. to begin with ?
 
Nige

Nige

Senior Member
Joined
Jun 22, 2011
Messages
29,228
Location
G..G..G..Granville.........!! Fetch your cloth.
Could it have to do with cost.? I posted some figures in another thread that I think would mean a second line would cost around $10m/km for equipment, plus installation costs on top of that. There may even be more required in the form of equipment for a trolley system to feed power back into the grid that would further increase the cost.
TBH you'd think that if it was even remotely beneficial economically over the long term that the mine would be doing it.
I have never seen a trolley assist system other than on an uphill loaded haul sector.
 
John C.

John C.

Senior Member
Joined
Jun 11, 2007
Messages
12,870
Location
Northwest
Occupation
Machinery & Equipment Appraiser
The 830 trucks that were in this area back in the nineties were AC.
 
Nige

Nige

Senior Member
Joined
Jun 22, 2011
Messages
29,228
Location
G..G..G..Granville.........!! Fetch your cloth.
digger doug said:
FWIU, regen just goes to the grid resistors, but I don't know if it's A.C. or D.C.
Click to expand...
It's DC on the Cat trucks (I assume everyone else's as well) and I guess that's where the technical challenge of returning power to the overhead line comes in.

From the Data sheet.
The AC Electric Drive in Propel. The diesel engine drives the rear-mounted generator through an isolation coupler. The AC power is rectified to a
nominal 2,600 volts to form the DC link. The DC link supplies power to the inverter where IGBT’s convert the DC signal to 3-phase AC to drive the traction motors.
The AC Electric Drive in Retard. During retarding the wheel motors become generators. Motor power is fed back through the DC link. The power is
fed to the contactor and chopper circuits and then exhausted through the radial grid. An AC fan blows air across the grid to dissipate the power and control retarding speed.
 
H

Hank R

Senior Member
Joined
May 28, 2014
Messages
2,068
Location
Princeton B.C. Canada
Occupation
Retired Truck driver and School bus driver
DT 3504. It's either 35 or 40 ton. Detroit Series 60 400 h.p. I think. They have ventilation to run 7 trucks now. Used to be 5.
 
BigWrench55

BigWrench55

Senior Member
Joined
Oct 11, 2018
Messages
1,176
Location
Somewhere
It was coming from a direction that you don't normally see this size machine. My best guess is that it came in by rail. It was headed south. There is a Komatsu dealer in that direction. Not sure where it is headed. 20 miles south is a highway that goes east or west. Or it could have been going to the port. I always wish I knew those answers. And I want to put it together wherever it is headed. :D
 
You must log in or register to reply here.
Top