Liftket STAGEKET, Operating Instructions Manual

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3.4 Limit switches in upright use
Available equipment
Required function Four-traced gear limit switch Four-traced gear limit switch and two
external limit switches
Operation limit switch for lifting Gear limit switch BO Gear limit switch BO
Operation limit switch for lowering Gear limit switch BU Gear limit switch BU
Emergency limit switch for lifting Gear limit switch NO External limit switch
Emergency limit switch for lowering Gear limit switch NU External limit switch
3.5 Limit switches in inverted use
If the electric chain hoist is applied in inverted use the chain leaves and enters the electric chain hoist
at the top.
For the assembly of the electric chain hoist the load hook at the end of the load chain has to be fixed on the
suspension and the hoist “climbs up”. Is it not necessary to do maintenance works on a catwalk, because the electric
chain hoist can be lowered down to the deepest load position. Only the test of the load hook must be done at the
suspension point and the lubrication of the load chain must take place over the full length of the chain.
The chain guide plate is assembled onto the chain guide to divert the outgoing chain safely into the chain box.
All limit switches have to be gear limit switches.
The lift limiter has to be assembled approximately 0.5 m from the end of the chain. Therewith it is ensured, that
enough chain weight for moving the chain safely into the chain box is left over, even if the hoist has reached its
lowest lifting position.
Available equipment
Required function Four-traced gear limit switch
Operation limit switch for lifting Gear limit switch BO
Operation limit switch for lowering Gear limit switch BU
Emergency limit switch for lifting Gear limit switch NO
Emergency limit switch for lowering Gear limit switch NU
3.6 Operation and emergency limit switches
3.6.1 Gear limit switches
There are four-traced gear limit switches available as standard, but for special constructions are six-
traced gear limit switches too.
The ON/OFF- positions are adjustable.
If a four-traced gear limit switch is fitted, one lifting and one lowering position are used for the operation (BU and BO)
and the other two positions for the emergency limits (NU and NO).
The low voltage control panel contains two buttons to bridge the operation limit switches to allow the hook or end stop
reaching the ultimate positions to be able to adjust these positions on the limit switch or to test this unit (see wiring
diagram).
It has to be observed, that after having actuated the emergency limit switch for lifting, the hoist can be reset from end
position as follows:
•
P
ress the green button “ON” on the control pendant.
•
Press the “DOWN”-button until the hoist leaves the end position.
These steps have to be executed by a trained specialist during testing of emergency limits or after having hit an
emergency limit switch.