5
G50/150
G50-2047
Operating instructions
Gear-switch and safety gear-switch
EN
4. Electrical connection
4.1 General information for electrical connection
The electrical connection may only be carried out by authorised
personnel in a de-energised condition.
For the cable entry, suitable cable glands with an appropriate degree of
protection must be used in the available threaded holes. The factory-in-
stalled plastic plugs only serve as transport and dust protection. Non-
used open input openings must be sealed by means of threaded plugs.
After wiring, the inner part of the switch must be imperatively cleaned
(e.g. removal of excess cable), considering that the presence of foreign
particles can affect the switching capacity of the switching elements.
An extremely strong tightening of the cover screws can reduce the
sealing efficiency and therefore must be avoided.
5. Particularities of the G 50-2047 gear switch
The previous paragraphs apply analogously to the G 50-2047 safety
gear switch for stage and studios or event locations, i.e. the setting
principle is identical, the mechanical data however are different. The
mechanical data for this switch type (G50) are indicated in Table 2.
The emergency limit switches must be positioned so that
with the machine running at maximum speed and with the
delay time to be expected in the system the machine is safely
stopped before colliding with fixed parts of the construction
(e.g. spindle extremity). For an emergency end shutdown,
stop category 0 must become operational. The execution of
control functions basically must be chosen in accordance with
IEC 60204-32.
The gear switch is available as version G 50-2047-1 with tongue and
groove to DIN 6885 Bl. 1 or as version G 50-2047-2 with reduced shaft
and mounting hole 4 H11. Shaft and worm have a positive linkage. The
switch is supplied with front adjustable 90º cam discs. Only internal
switches, i.e. switches in position 4, may be used as emergency limit
switches. On each side, maximum 1 Z 6881-11-1 switch may be in-
stalled in position 4 (see figure "Position of the emergency limit switch").
5.1 Selection and setting instructions
In order to ensure the safe operation of a device, certain safety distanc-
es between the fixed surrounding parts and the moving parts must not
be dropped below. These safety distances are ensured by the switching
points of the emergency contacts and the upstream operating contacts
of the gear switch. The possible displacements of the switching points
are calculated in a trial series during the prototype test. Based on the
useful travel (Lmax) of the gear switch, the following displacements are
possible:
Operating contacts:
y1 = 0.56 % of Lmax
Emergency contacts (Z type): y2 = 0.68 % of Lmax
In order to ensure a correct operation of the safety gear switch to the
conditions and requirements of BGV C1 and the prototype part test, the
distances y1 and y2 imperatively must be observed.
The setting instruction with the required magnitudes is represented in
the Figure on page 6.
For the selection of the gear switch and for the calculation of the switch-
ing point settings, the following is applicable:
L:
Required operating travel
L
fest
: Distance between the fixed parts in the end positions
L
max
: Maximum available travel of the gear switch
U
ben
: Necessary revolutions for the travel of a device
U
Nutz
: Useful revolutions of the gear switch to Table 2
N
A,B
: After-travel of the gear after shutdown at full speed depending
on the direction of movement and load condition
D:
Diameter of the last rotating part of a device (e.g. cable drum,
toothed wheel) before the gear switch being driven in
i
E
:
Gear ratio e.g. between cable drum and gear switch
Necessary revolutions for the required operating travel:
L
(Gl. 1)
π · D · i
E
U
ben
must be smaller as the useful revolutions U
nutz
in
Table 2 for type G 50 column Z.
Position of the emergency limit switch
1
1
Key
1
Only use interior switches as emergency limit switch.
N
N
N
y2
y2
4
3
A+
y2
y1
y1
L
Lm
ax
1
2
N
Lf
es
t
Key
1
Fixed part
2
Fixed part e.g. stage
3
Position of the operating contact
4
Position of the emergency contact
L
Operating travel
L
max
Useful travel gear switch
