29
3.8
Mechanical underload protection
Limit switch
Suspension point
Suspension eye
Electric chain hoist
Pressure spring
Nut for adjustment of
underload
Load centre of gravity
Figure 27: Construction and function of mechanical underload protection
The suspension eye is fixed at the electric chain hoist.
It can move up and down at one bolt to indicate the load and swivels around the other bolt.
The pressure springs will be adjusted by self-locking nuts.
If the load on the hoist is less than the set value the suspension eye will swivel around one suspension bolt and
activate a limit switch on the opposite side. This switch cut off the power for lowering.
The spring loaded underload protection is adjusted on approximately 10-15% of the nominal load by the
manufacturer.
After operation of the underload protection a lifting movement will still be possible to move out of a dangerous
condition.
For set up mode without load the override switch and the function switch ‚lowering‘ must be pressed simultaneously.
Caution!
The operation of the override switch is allowed in set up mode only.
Summary of Contents for STAGEKET
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Page 56: ...56 14 Example of Declaration of Incorporation...
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