Manitowoc Published 12-10-19, Control # 258-05 3-31
MLC90A-1/MLC100-1 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
OPERATING LIMITS IDENTIFICATION
The following table lists the operating limits this crane is equipped with and identifies which of those limits are bypassable.
When a limit is reached, the operating limit fault is activated and the corresponding fault icon appears in the fault bar of the
Main Display Working Screen.
Table 3-12. Operating Limits Description
Operating Limit Icon
Bail, Minimum
This limit stops the corresponding drum from lowering when there are three to four wraps of wire rope
remaining on the drum.
• The load can be raised after the limit is contacted.
• This limit can only be bypassed by disconnecting the electric cable from the limit switch and connecting
the shorting plug to the cable end.
WARNING
Falling Load Hazard!
When lowering a load below the minimum bail limit, do so slowly with extreme caution. Do not lower the
load to the point where less than three full wraps of wire rope are on the drum. The wire rope could be
pulled out of the drum allowing the load to fall.
Block Up
This limit stops the boom from lowering and the load drum from hoisting when the load contacts a block-up
limit switch.
• The load on the corresponding drum can be lowered and the boom can be raised after a block-up limit
switch is contacted.
• This limit can be bypassed using the limit bypass switch on the right console.
WARNING
Two-Blocking Hazard!
If it is necessary to hoist a load above the block-up limit, do so slowly with extreme caution to prevent two-
blocking.
Do not hoist the load above the minimum block clearance given in the Reeving Diagrams in Section 4 of
this manual.
Do not use the limit bypass switch to lower the boom after the block-up limit is contacted, or two-blocking
could occur. The load could fall.
CAUTION
Avoid Boom Damage!
When operating at high boom angles and high load block heights, maintain adequate clearance between
the load block and the boom top. If this precaution is not observed, the load block can contact the boom
top resulting in damage to the boom top.
Boom Max Up
This limit stops the boom when it is raised to 82°.
This limit is not bypassable. The boom can be lowered after this limit is reached.
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