Manitowoc Published 11-20-19, Control # 234-19 3-47
MLC300 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
The following table describes the operating limits this crane is equipped with. 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 3-17. 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.
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
In the non-setup mode, this limit stops the boom or luffing jib 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 or luffing jib can be raised after a
block-up limit switch is contacted.
• The limit bypass switch must be turned to the bypass position before a load can be hoisted above the
limit.
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 (see Section 4 of
the MLC300 Operator Manual).
Do not use the limit bypass switch to lower the boom or the luffing jib after the block-up limit is contacted,
or two-blocking could occur. The load could fall.
Boom Max Up
This limit stops the boom when the boom is raised to one of the following maximum angles:
85° for boom only with or without VPC-MAX attachment
86° for boom with luffing jib and without VPC-MAX attachment
85° for boom and luffing jib with VPC-MAX attachment
The boom can be lowered after this limit is reached.
The boom max up limit angle must be readjusted each time the luffing jib is installed or removed. See
Section 4 of the Crane Service Manual or Section 6 Luffing Jib Operator Manual for the adjustment
procedure.
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