6
Operating instructions
Gear-switch and safety gear-switch
G50/150
G50-2047
EN
Max. possible travel of the gear switch:
L
max
=
L · U
nutz
(Gl. 2)
U
ben
Max. possible displacement of the switching points:
Operating contacts: y1 = 0.0056 · L
max
(Gl. 3.1)
Emergency contacts (Z type): y2 = 0.0068 · L
max
(Gl. 3.2)
Minimum distance between fixed parts in the vicinity:
L
fixed
= L + 2 [y1 + y2 + 2 (NA + NB)]
(Gl. 4)
The possible after-travels NA and NB must be calculated depending on
the hazard for each direction of movement and load condition (full load
or partial load) at full speed; they also depend on the gear used and its
set-up.
L
max
> L
fixed
(Gl. 5)
Example:
Required operating travel:
L = 20 m
Diameter of the last rotating part:
D = 0.8 m
Gear ratio between cable drum and gear switch: i
E
= 0.25
Useful revolution to Table 2:
U
nutz
= 38.9 (T01)
U
nutz
= 36.9 (Z)
Calculation example:
from Gl. 1
U
ben
=
20
= 31.8 ca. 32 revolutions
p · 0.8 · 0.25
from Gl. 2
Operating contacts
Emergency contacts
L
max
=
20 m · 38.9
L
max
=
20 m · 36.9
32
32
L
max
=
24.3
L
max
=
23.06 m
from Gl. 3.1
and Gl. 3.2:
y
1
=
0.0056 · L
max
y
2
=
0.0068 · L
max
y
1
=
0.0056 · 24.3
y
2
=
0.0068 · 23.06
y
1
= 0.13 m
y
2
= 0.15 m
from Gl. 2:
L
fixed
=
20 m + 2 [0.13 m + 0.15 m + 2 (N
A
+ N
B
)]
L
fixed
=
20.58 m + (N
A
+ N
B
)
A possible after-travel N must be added to this calculated value Lfixed,
which must be calculated depending on the hazard in accordance with
the direction of movement and depending on the load condition (full
load or partial load). It also depends on the gear of the device and its
set-up.
The displacement can be converted in degrees in the following way:
Y
1,2
[DEGREE] = U
nutz
· Y
1,2
· y
1,2
(DEGREE) = U
nutz
· y
1,2
· 360°
6. Set-up and maintenance
6.1 Functional testing
The safety function of the gear switch must be tested. The following
conditions must be previously checked and met:
1. Proper fixation of the gear switch
2. Check the integrity of the cable entry and connections
3. Check the switch enclosure for damage
6.2 Maintenance
The gear switch generally does not require maintenance or inspection.
A regular visual inspection and functional test, including the following
steps, is recommended:
1. Check the proper fixation of the gear switch
2. Remove particles of dust and soiling
3. Check cable entry and connections
4. Lubrication of the disc cam (lubricant used in factory: ISOFLEX
TOPAS NB 52) can extend the lifetime. The use of silicon-based
grease is not authorised.
Damaged or defective components must be replaced.
7. Disassembly and disposal
7.1 Disassembly
The gear switch must be disassembled in a de-energised condition
only.
7.2 Disposal
The gear switch must be disposed of in an appropriate manner in
accordance with the national prescriptions and legislations.
