OPERATING CONTROLS AND PROCEDURES 2250 OPERATOR MANUAL
3-22
Published 06-24-16, Control # 241-01
Table 3-2. Limit Bypass Identification
E5—Limit Bypass Switch
This switch bypasses the limits identified in Table 3-2.
Insert and turn the key clockwise to bypass the reached
operating limits. This position allows the functions to be
operated beyond the limits.
Release the key to activate the limits. This position allows
the limits to stop the functions in the normal manner. The key
must be in this position for all normal operation. Otherwise,
structural damage can occur.
Remove the key to prevent unauthorized operation.
NOTE: To bypass the limits listed in Table 3-2
for luffing jib
setup, proceed as follows:
• Select and confirm Luffing Jib Setup mode.
• Rotate the limit bypass switch (E5) clockwise
and release. The limits will remain bypassed
for 10 seconds.
• Move the desired control handle (luffing hoist,
boom hoist, load drum)—one control handle at
a time—in the required direction. The limits will
remain bypassed for as long as the handle is
moved in either direction.
• The limits will remain bypassed for 10 seconds
after the control handle(s) is returned to OFF.
E6—Drum Selector
Press the front end of the rocker switch to operate the drum 2
load drum.
Press the rear end of the rocker switch to operate the drum 3
load drum.
NOTE: The drum selector is provided only when the crane
has a front drum and a split-rear drum.
The drum clutch releases and the drum park brake
applies to prevent the unused drum from turning.
Limit
Limit Bypass Switch (E5)
(momentary key switch)
Limit Bypass Switch (E5)
(momentary key switch)
Luffing Jib Setup Mode On
1
External Override Switch
2
non-CE
3
CE non-CE CE CE
Boom Up Limit No No No No No
Boom Down Limit Yes Yes No No No
Block-Up Limit (each drum) Yes Yes Yes Yes No
Bail Limits—Max and Min (each drum) Yes Yes No No No
Rated Capacity Indicator/Limiter Yes
Yes
4
No No
Yes
5
Hoist Limit (equalizer and boom stop) Yes Yes No No No
Luffing Jib Maximum Up1 Yes No Yes Yes No
Luffing Jib Maximum Up 2
Yes
6
No
Yes
6
Yes
6
No
Luffing Jib Maximum Down 1 Yes No Yes Yes No
Luffing Jib Maximum Down 2 Yes No Yes No No
1
Use only for rigging. See E5—Limit Bypass Switch on page 3-22.
2
See Rated Capacity Indicator/Limiter Operation Manual.
3
CE = Cranes that comply with 2010 European Requirements.
4
Only while operating between 100% and 110% rated capacity. The speed of the crane functions is limited to 15% of their
maximum speed for movements that increase load.
5
The speed of the crane functions is limited to 15% of their maximum speed for movements that increase load.
6
Only when the boom is below 50°.
WARNING
Falling Boom or Load Hazard!
Avoid the possibility of death or serious injury from a
falling boom or load.
When bypassing a limit, carefully follow the instructions
under Limit Devices on page 3-29
.
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