Start up problem in Conveyor Systems 1

[gokulkrish2]

Hello all,

I am working in a mining company and working on a conveyor project. The conveyor actually wont start if tried to start up with load on it. I analyzed the data of the motor current and it shows that the motor withdraws 180 amp for a maximum load on the conveyor and it's rating is 270 amp. The motor rating is 250 HP, 270 amp FLA and 1.15 service factor.

So with this result i figured out that the motor's rating is okay, but there is a problem with the starting torque or the starting current. My conveyor system is driven by the motor through a delay fill fluid coupling and started by a soft start.

I think that taking out the soft start and connecting the motor across the line would solve the problem. Any comments on this. Any repercussions??

Can you people suggest me what i should really do to overcome this problem

thanks
gokul

 

[7anoter4]

If the conveyor belt is strong enough one may start the full loaded conveyor by "scrawling" that means by short time energizing .If it is a rubber steel reinforced belt you have to prepare the "vulcanizing team " on stand by. But if it is chain conveyor one may succeed always.
The full burden stop often occurs if there is an electric outage or if someone pulls the pulling rope [in order to pass over the belt].The idea to empty a full length of conveyor by shovels is attractive indeed. But how much time you have to empty 500m full load conveyor? [I think that is a 500 m long belt full of 100 tons material!]
Regards

 

[7anoter4]

sorry,my bad english: I meant "crawling" not"scrawling".

 

[roydm]

Zanoter4,
Yes and then when you have finished shoveling it off you have to start up and shovel it back on again.
Good exercise I agree. One mine I worked at had 3,000 tph conveyors with 3 x 900 HP wound rotor motors, even they had trouble pulling away after a fully loaded trip.
Regards
Roy

 

[gokulkrish2]

I thank everyone so much for taking their time to respond to my thread. Im sorry for the late reply as i was out on a vacation. After reading all the posts, i also feel that i should try increasing the starting current of the soft starter and then check for the torque transfer. Then if that doesnt work i would check the fuild coupling.

But i dont know how to check the torque transfer. what test should i do. Sorry if its a very simple and silly ques. I'm new to the work field and im learning slowly.

Thanks.

gokul

 

[controlsdude]

Not familar with that term
Fluid coupling?
Is this the item that is refernced here?

http://www.kraftpower.com/transfluid/fluid_couplings.pdf

 

[itsmoked]

Yes.

Keith Cress
kcress -

http://www.flaminsystems.com