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QAY220 All Terrain Crane Operation Manual
Chapter 6 Crane electric system
The electric system is supplied by the way
of DC 24V, single line with negative ground.
With PLC programmable controller as core,
the system consists of engine control, safety
control, electric-proportional control, load
moment limiter control and auxiliary function
control.
6-1 Safety control
1) Load moment indicator (LMI) (see
IFLEX5 controller operation manual);
2) Safety control switch in electric-
proportional system: the electric-proportional
system can work only after the switch is turn
on.
3) Anti-two block: it consists of the
limiter switch on boom head or jib head and
weight. When the distance of 800 mm between
the hook block center and the center of pulley
on boom is approaching, it stops hook block
movement.
4) Lowering limiter: when there are only
3~5 wraps of wire rope left on the drum, the
limiter automatically activates to stop hook
lowering.
5) Indicator lamps: hydraulic oil clogged
indicator lamp, low oil pressure indicator lamp,
high water temperature indicator lamp, boom
pin and cylinder pin indicator lamps, etc.
6-2 Operation control
Crane operations consist of main, auxiliary
winches, slewing, elevating, telescoping boom
and erecting counterweight, etc. Basing on
rated automatic and manual working modes, all
operations can be performed by operating two
levers respectively on the left and right armchair
boxes. Moving left lever towards X (horizontal)
direction is to control crane slewing, Y (vertical)
direction is to control auxiliary winch/boom
telescoping; moving right lever towards X
(horizontal) direction is to control boom
elevating, Y (vertical) direction is to control
main winch.
Crane electric system
Chapter 6
6-1
Courtesy of CraneMarket.com
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