Wire Rope Hoists _ Operating and Maintenance ... - STAHL-POLSKA

6 Inspection and maintenance
6.6 Hoist limit switch (standard crane)
36
a [mm]
50 Hz 60 Hz
130 150
70 80
40 50
6.6.1 Description of system
The wire rope hoist is equipped as standard with an emergency limit switch for
disconnecting in top and bottom hook position. (Switching points A↑ and A↓). The
gear limit switch (GE-S) is installed in the panel box on the gear.
If the original controls/circuit diagrams are used, the corresponding hoisting
direction and the cross travel if any are disabled when the limit switch is activated.
The opposing hoisting direction is clear.
An additional operational limit switch *2 for disconnecting in top and bottom hook
position during normal operation can be fitted as an option. (Additional switching
points B↑ and B↓).
The control pendant includes an override button for checking the emergency limit
switch (S260).
If the operational limit switch fails, the hoist can only leave the end position by
activating this override button.
6.6.2 Safety notes
The limit switch is constructed according to the state of the art and is safe in
operation. However dangers may arise if it is used incorrectly and not for its intended
purpose.
6.6.3 Testing emergency hoist limit switch
Test at fast and creep speed without load.
1 Activate the "up" button on the control pendant carefully, observing the hoisting
motion, until the limit switch disconnects in top hook position (A↑).
2 Minimum clearance "a" between bottom hook block and nearest obstacle, see
table, if necessary reset the limit switch, see page 37.
3 Press the "down" button and check bottom hook position in the same way.
4 Minimum clearance between rope guide (S) and clamping claws (K) for rope
anchorage = 20 mm, see sketch, if necessary reset limit switch, see page 37.
6.6.4 Testing combined operational and emergency hoist limit switch
Test at fast and creep speed without load.
1 Activate the "up" button on the control pendant carefully, observing the hoisting
motion, until the limit switch disconnects in the highest operational hook position
(B↑).
2 Press the override button in the control and at the sametime the "up" button until
the emergency limit switch disconnects (A↑). If the hoist does not continue to
move, the emergency limit switch was activated in step 1 and the operational limit
switch is not working. (As an option, the override button is also possible in the control
pendant.)
3 Minimum clearance "a" see table.
4 Press "down" button and check bottom hook position in the same way.
5 Minimum clearance between rope guide (S) and clamping claws (K) for rope
anchorage = 20 mm, see sketch, if this is not the case, reset limit switch.
The clearances between the switching points for operational and emergency limit
switches are set for normal operating conditions, however they can be adjusted if
necessary.
*1 Effective hook path with operational limit switch
*2 Option
10.08
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