Zoomlion ZCC1100, Operator'S Manual, Page: 187 / 291

Operator’s Manual for Crawler Crane
Crane
Operation
4-47
(7) When the system sends out the alarm, the operator should operate the crane
towards safe directions. If it is necessary to operate the crane towards dangerous
directions, the operator can refer to Section 4.4.
(8) The high-speed switch is only used when the crane is working without a load or
with a light load and only the hoisting winch is operated.
4.5.6.2 Free-fall operation
Procedures for free-fall operation:
a) Turn the free-fall master switch (No.1 in the figure 4-5) to
“
ON
”
position.
b) Depress the free-fall brake pedal (No.12 in the figure 4-1) completely.
c) Rotate the free-fall switch of corresponding winch (e.g.
“
H1 free fall
”
switch) clockwise
to
“
ON
”
position, and then release the free-fall brake pedal gradually. At this time, the
hook starts to lower freely. In this process, the foot of operator should be placed on the
free-fall brake pedal and the operator can adjust the lowering speed of the hook by
depressing the free-fall brake pedal.
d) Depress the free-fall brake pedal again to stop the free-fall movement of the hook.
e) After the winding drum stops completely, release the free-fall switch of corresponding
winch, and turn the free-fall master switch to
“
OFF
”
position.
DANGER
(1) If free-fall operation is not finished (i.e. the winding drum does not stop rotating
completely), never reset the free-fall switch of corresponding winch.
(2) When using control lever to operate the hoisting winch, never turn on any free-fall
switches.
(3) Under fixed jib configuration, the free-fall operation is used only when the crane is
working without a load.
(4) In the free-fall process, never depress the free-fall brake pedal suddenly to stop
free-fall operation. Otherwise, the crane may be damaged or the personnel may be
injured.
(5) Calculate hoisting rope length before free-fall operation so that there are at least
three windings of rope left on the drum.
CAUTION
(1) Each hoisting winch can perform free-fall operation independently, however, only
one free-fall brake pedal is used to brake the hoisting winch during free-fall
operation.
(2) After free-fall master switch is turned on, the system will cut off any operation of
winch automatically.
(3) To carry out free-fall movement, the operator must first turn on the free-fall master
switch, and then switch on the free-fall switch of winch. Otherwise, the operation is
invalid.
For reference only.
Operators manual should be consulted and adhered to.