Overload Protection; Limit Switch - Pfaff BETA BGV C1 Mode D'emploi

Electric wire rope winch >BETA II< BGV C1
English
for stages and studios

4.6 Overload protection:

Electric wire rope winches for stages and studios have to be equipped with an overload
protection.
The overload protection operates by means of a load monitoring device, which is adjusted to 100% up to
110% of the driving power.
The mounted-in electronic overload protection works with a start bridging and do not release the operator to
check the carrying capacity and the charge. Take care that the load does not interlock during the starting
phase.
The overload protection does not operate by constant press-release in short intervals.
The electronic overload protection is a warning installation and it is not allowed for regular use to stop at end
positions. Use always path-dependent limit switches to stop at positions.
Take into consideration the rigidity of the complete lifting installation (inclusive frame etc.) in connection with
the max. overload time (start bridging, brake time, etc.) to determine the overload factor.
The max. overload should not exceed the upper limits of the carrying capacity of the system. (Take notice of
the valid directives.)
The manufacturer of the entire installation is responsible for deciding the overload capacity of the
system. The operator is not allowed to change the adjustment of the load monitoring device.

4.7 Limit switch

Operational and emergency limit switches have to be provided for lifting systems acc. to regulation BGV C1
(DIN 56925 and DIN 56921-11).
Specifically for the standard design Electric wire rope winch >BETA< BGV C1, the operational and end limit
switches are to be built-in in the form of a gear limit switch.
With mounted-in limit switches, definitely check function in connection with the entire installation.
With wrong polarity or wrong connection, the limit switches are ineffective.
Attention: Do not operate the winch until having adjusted and connected the limit switches!
Adjusting of limit switches only by competent persons.
Please observe:
♦ Depending on design the adjustment precision of the limit switch is approx. ±50mm. This cut off precision
can only be kept in the first layer.
♦ The after running of the winch is approx. 1/100 up to 1/500 of the lifting speed [m/min].
♦ In any case, it has to be observed that the elongation of the rope may change the lift limit positions. The
remaining elongation of the rope up to replacement state of wear may be approx. 1%.
♦ A regular check of the adjustment / turn-off ways is necessary.
Adjustment of the gear limit switch
For contact adjustment, remove the cap of the limit switch.
Before adjusting the switching point assure that the live contact connection are covered by a
protection against accidental touch or with flat plugs by a receptacle for tabs, and that
touching of the connections is excluded.
The limit switch is provided with individual or block adjustment.
Individual adjustment
An infinitely adjustable cam disc is provided for each contact. Independently from each other, the cam discs
(1) can be set with the white adjusting screw (2). It is not necessary to loosen any parts for the adjustment.
The screw is self-locked. The screw can be turned by means of a screw driver of
10mm or 4mm or by means of a hexagon socket screw key of 4mm.
When turning the screw by one clockwise revolution 360°, the cam disc as well is
turned clockwise by 2,464° (view to the rear part, the B-side of the switch).
The standard cam discs are designed to dispose of a max. useful travel and a
max. overtravel. When exceeding the overtravel, the switch is not damaged. The
contact, however, is opened or closed again.
Block adjustment
With the black adjusting screw (2) the base of all cam discs (1) can be commonly
adjusted. The relatives adjustments of the individual contacts to each other are
not modified. When turning the black screw clockwise by one revolution, the cam
discs as well are turned clockwise by 0,575°.
If functions provided by the el. control are not required for operation, the terminals which are not re-
quired have to be by-passed respectively.
technische Änderungen vorbehalten design changes under reserve
04.01.411
changements techniques sous réserve
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