Question about a device in Mehgard

[Nemaa]

There is a device called Thunder Can in Mehgard (the snowy island accessible by train) and it is not working. Is there any way to use it? What shall I find? Is there a quest for it?

This is the text I get if I want to use it:
This dwarven Thunder Can does not work: the lever is broken and one of the gears is missing some teeth.

[Kosiciel]

You can't do anything with this. Lina is charged at full, right? :)

[Nemaa]

So this is an other Lina charger device like the one at the dwarf starting location. I thought it is involved with some quest.