HW-K wrote:

On Thu, 14 Jul 2011 13:56:47 +0100,
lid (Adrian Tuddenham) wrote:

Adrian C wrote:

On 11/07/2011 18:09, Adrian Tuddenham wrote: Does anyone happen to
have the circuit diagram for a Lansing R16 forklift truck? I've
been asked to find an intermittent fault in the traction motor control
circuit.

Be careful with these things.

German Forklift Training Video (funny)
http://www.youtube.com/watch?v=Tqd4aPs5WTA

Thanks for that, you've really cheered me up :-(

I was already being very cautious. Before I did anything I measured the
battery voltage: 48v, and had a look at the main fuse: 500 A, - and
worked out that one slip of the spanner could involve me in a lot of
very hot metal.

It weighs about 4 tonnes, so I'm also very aware of what might happen if
the speed contoller chopper circuits turn out to have have failed S/C
and I accidentally close the motor contactor.

Have you verified that the motor brushes are in good order and
properly bedded ?

Not yet. I haven't even succeeded in getting the motor contactor to
close.

There are a few stray wires that need putting back in their correct
places before I can do anything more. The circuit incorporates lots of
interlocks which won't allow anything to operate if there is a fault in
the poower control gear.

The manual (which I have now been able to borrow) says that the wheels
ought to be jacked clear of the floor before testing the traction
circuits. The electronics problem has temporarily become a background
issue and some heavy engineering is now required (the truck weighs 4
tonnes).


--
~ Adrian Tuddenham ~
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www.poppyrecords.co.uk