Adjusting The Suspension - Carl Stahl Kromer 7241 Instrucciones De Empleo

Installation
Prior to installing the zero gravity balancer, verify that the
suspension structure to which the balancer and its safety
chain are fastened provide adequate stability.
To install the zero gravity balancer, be sure to proceed as
follows:
G Via the safety suspension (2), suspend the balancer so
that it can be easily aligned and moved in any working
direction (DIN 15112, Part 3.2).
G It is mandatory to mount the supplied safety chain (4) in
addition to the safety suspension (2) in accordance with
the provisions of DIN 15112, Part 3.2. Note that the maxi-
mum falling distance permitted is 100 mm! It must be
guaranteed that the anti-crash safety device does not
interfere with the balancer across its entire working
range.
G Attach the load to the screw-type spring hook installed at
the cable end, then close the hook and screw the knurled
lock nut in place.
G Adjust the balancer to the working load (see description
under Adjusting the working load).
G If the zero-gravity balancer is operated with welding ton-
gs, an insulated suspension is required for the balancer
due to the leakage currents involved (see VDE 0100, sec-
tion 19, and VDE 0545).
Adjusting the cable length
The zero gravity balancer comes with a long cable so the
cable length can be individually adjusted to on-site require-
ments. Adjusting the cable length is done with the cable
wedge (7). After lengthening or shortening the cable as
required, the free cable end must be compressed with the
supplied ferrule (8) (or with a clamp complying with DIN
3093, Parts 1 to 3); the projecting cable end must then be
cut off flush.
A minimum distance of 100 mm must be maintained
between the cable clamp and the cable wedge.

Adjusting the suspension

Fine adjustment of the suspension is possible to ensure
low-wear cable and drum operation. To this end, adjust the
suspension hook along the bolt so that the zero gravity bal-
ancer is suspended in a more or less horizontal position
within the working area.
The hook distance to be maintained on the left above the
housing slot should be as follows for the various load
ranges, relative to the specified maximum load (factory set-
ting):
7241-01 = approx. 8 mm
7241-02 = approx. 8 mm
7241-03 = approx. 8 mm
7241-04 = approx. 9 mm
7241-05 = approx. 10 mm
7241-06 = approx. 11 mm
7241-07 = approx. 12 mm
Proceed as follows: Loosen the suspension's clamping
screw (3), move the suspension appropriately, then retight-
en the clamping screw (3).
Adjusting the working load
The zero gravity balancer has been factory-preset to the
maximum load permissible for the type/model in question.
G After attaching the load, apply a size-17 socket span-
ner/wrench to the endless screw (9), then rotate the span-
ner in the direction of the "-" symbol until the weight of
the suspended working load is exactly counterbalanced.
G When setting the minimum load, never extend the cable
beyond a length of 1 m, as otherwise the spring fracture
safeguard may be tripped. In case the safeguard mecha-
nism has already been activated, first carefully preload
the spring in the „+" direction as far as it will go (the
spring is now fully "on block"), then adjust the tension
again to the working load by rotating the endless screw
(9) in the „-" direction.
G To prevent spring destruction, do not slacken it too
much! Full spring release is permitted only if no load
is connected!
G Infinitely variable load adjustment is possible within the
balancer's load range (see rating plate (1) for details). To
adjust to lighter working loads, simply rotate the endless
screw (9) in the "-" direction; for heavier loads, rotate it in
the "+" direction. Note that the zero gravity balancer may
not be operated outside the working range indicated on
the rating plate!
Cable stop buffer/Adjusting the cable
extension
The cable stop buffer can be easily adjusted by loosening
the screws and simply moving the elastic ball or stop buffer
(5) and the cable clamp (6) to the desired position within the
cable extension section. Be sure to tighten the cable clamp
screws properly after each adjustment.
Never exceed the maximum permissible cable extension
(whether or not the cable length has been increased)!
The limit or end stop is marked by the factory-installed
ferrule.
Drum lock
The drum lock (10) allows you to block the drum for cable
replacement, without any need to unload the spring (see
description under Replacing the cable).
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