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

6 Inspection and maintenance
6.8 Hoist limit switch
(radio-controlled crane)
42
1/1
2/2-1
2/1
4/2-1
a [mm]
50 Hz 60 Hz
130 150
70 80
4/1 40 50
6.8.1 Description of emergency hoist limit switch 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, only the corresponding hoisting
direction is disabled when the limit switch is activated. The opposing hoisting
direction is clear.
It is equipped with an additional safety hoist limit switch (S↑) above top hook position.
If during a fault the emergency limit switch for top hook position is overrun, the
safety hoist limit switch disconnects the hwole hoist and the fault indicator light
(H252) on the electronics box lights up. Leaving the limit switch region is not possible
until the faulthas been elminated and terminals 110 to 116 on the terminal strip in the
hoist control have been bridged.
The gear limit switch (GE-S) is in the control box on the gear.
6.8.2 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 not set and used for its intended
purpose.
6.8.3 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 44.
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 44.
6.8.4 Testing emergency hoist limit switch and indicator light
The safety hoist limit switch (S↑) is set in the factory and does not need to be tested
on-site.
It is possible to test the indicator light (H252) using a bridging wire between indicator
light and terminal strip.
*1 Effective hook path
10.08
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