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The GS550 System
The GS550 System
2.4c GS075B Installation
1. Install the GS075B on the LB011 (switch
bracket) already installed on the crane boom
(step 2.4a), with the antenna pointing away
from the boom.
2. Install a weight and chain assembly to the eye
nut. The weight and chain assembly can either
be supplied by
LSI
LSI (as an option) or the original
assembly supplied with the crane. If the original
assembly is to be used, its total weight must not
be more than 13lb.
2.4d Chain length adjustment
1. Chain length adjustment № 1 – minimum
boom angle
a. At minimum boom angle, with no
additional weight on the hook block and
one part of line only, lift the boom just
enough to have the hook block suspend
and clear the sensor chain and weight.
b. Hoist slowly until the buzzer sounds. Note
the hoisting distance remaining; this
distance must be great enough to allow
the operator and the lockout system, if
installed, to prevent a two-block event. If
necessary, add chain between the sensor
and weight to increase warning distance. If
still insufficient, contact your service
representative.
2. Chain length adjustment № 2- maximum
boom angle
a. Raise the boom to the maximum angle.
b. Hoist slowly as described in Step 1.b.
Verify that the warning distance is equal
to or greater than that determined at the
minimum boom angle.
3. Chain length adjustment № 3 – speed test:
Lower the boom until the weight height
becomes visually clear to the operator.
Repeatedly create two-block, progressively
hoisting faster, to ensure that the warning and
lockout work within acceptable amount of time
and distance. Increase the length of the chain if
needed.
B) Hook block stops
rising, two-block
prevented with
safety margin
Boom
base
A) Anti-two-block
switch triggers
two-block alarm
Boom
base
Figure: Chain length test at minimum angle
B) Hook block stops
rising, two-block
prevented with
safety margin
Boom
base
A) Anti-two-block
switch triggers
two-block alarm
Boom
base
Figure: Chain length test at maximum angle
Figure: Chain length adjustment
IMPORTANT!
To increase chain length, only use
lightweight chain.
!
!
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