Installation 35
4. Chain length adjustment № 2 – maximum boom angle
a. Raise the boom to the maximum angle.
b. Hoist slowly until the red two-block warning lights comes on and 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 lightweight chain between the sensor and weight to increase warning distance. Ver-
ify that the warning distance is equal to or greater than that determined at the minimum
boom angle.
Tip: Have a second person stand off to the side of the crane to closely monitor the hoisting
distance from the hook block to the head sheave block.
5. 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 en-
sure that the warning and lockout work within acceptable amount of time and distance. In-
crease the length of the small chain if needed.
Length Sensor Cable Reel
W
ARNING
! Arc welding will damage LSI sensors, causing immediate failure or greatly
reducing functional life. Arc welding on or near LSI equipment will void warranty. Keep
LSI equipment well clear of any arc welding.
The GS101 includes the LS101 cable reel and the GS011 angle/length sensor. The GS011 is
concealed under the cover of the LS101, though the antenna is visible. Following cable reel
installation and boom length indication calibration, boom angle indication will have to be verified
and possibly calibrated. Refer to Angle Calibration Procedure № 1: Mechanical Set-Up and Angle
Calibration Procedure № 2: Correct with the GS550 in this manual.
A) Anti-two-block
switch triggers
two-block alarm
B) Hook block stops rising,
two-block prevented with
safety margin
Figure: Ant
tw
block weight chain length test at maximum boom angl
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