Zoomlion ZCC1100, Operator'S Manual, Page: 173 / 291

Operator’s Manual for Crawler Crane
Crane
Operation
4-33
4.4.7 Lowering limiter
Figure 4-33 Lowering limiter
In order to prevent wire rope from being wound in the opposite direction after it is unwound
completely, the lowering limit switches fitted on H1, H2 and H3 are triggered when there are
only three windings of wire rope left on the drums. Under this condition, the buzzer will sound,
the tricolor light will send out yellow and red warning continuously, and the icon appears
on the load moment limiter. At this time, the movement of “reel off winch” is switched off, and
only the movement of ‘spool up winch” can be carried out.
CAUTION
Bypass those limited movements in accordance with the following methods:
(1) Turn bypass switch (in the electrical control box of slewing table) clockwise until
the icon appears on the load moment limiter. At this time, the limited
movement “reel off winch” is bypassed. However, the tricolor light sends out red
warning and the buzzer sounds continuously.
(2) Rotate lowering bypass switch (No.6 in the figure 4-2) clockwise until the icon
appears on the load moment limiter. At this time, the limited movement “reel off
winch” is bypassed. However, the tricolor light sends out yellow and red warning,
and the buzzer sounds continuously.
DANGER
(1) The lowering bypass switch or bypass switch is only used in commissioning and
maintenance condition or to avoid accident occurring.
(2) If lowering limiter is bypassed, there is a risk of increasing accidents!
For reference only.
Operators manual should be consulted and adhered to.