K2

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What is ‘Zero Height Reference?

07/09/2010

Take the example of a simple chain hoist hanging from a point 20m above the stage. K2 works by calculating how much chain is hanging out of the hoist at any point.This is the opposite of what the controller needs to know as it is interested in how high above the ground the end of the chain is.

Zero Height Reference is the length of the chain at the point where the operator would consider the flown item to be at zero height.  In our example above this means that 20m of chain would have be hanging from the hoist in order for the end of the chain to touch the floor and therefore be at zero height.  The Zero Height Reference would therefore be 20,000.
In the vast majority of cases the ZHR is the same value as the Z value of the link End position in the Construct Setup (i.e. the point where the hoist is attached to the roof)