Crane with Danfoss distributor (available on request)
The lifting moment limiting device system uses the specific functions of the distribu-
tor by utilising an electro-hydraulic technology, it does not allow you exceed the set
value, by disactivating the controls (levers in neutral position) commanded by the
limiting device.
The condition of intervention is operated by the position of the outer boom (or, if
hydraulic extension is fitted, the position of the extension outer boom), on which
the electronic signal position (mercury level switch) is read by a special electroval-
ve. This determines controls which are locking or unlocking (resetting) of the con-
trols concerned.
When the moment is reduced, it resets automatically (the manoeuvres blocked by
the device are released). N.B.: There is a delay of four (4) seconds after the
moment reduction before the reset can occur in order to safeguard the stability of
the device.
Fig. 18a-b-c illustrate the configurations of the crane (and of the eventual hydraulic
extension) with the manoeuvres allowed and not allowed by the device, in connec-
tion with the horizontal position of the crane and extension outer booms.
(!) CAUTION DANGER (!)
On the outer boom there is a mercury capsule (mercury level switch) duly protected
and provided with the following warning stickers.
Mercury is extremely toxic. In case of replacement and/or scrapping,
dispose of or recycle the capsule containing mercury with maximum
care, and in accordance with the national regulations in force.
H1.2 Lifting moment limiting device for two working
sectors (optional)
In case of one sector of the working area with reduced stability of the vehicle (e.g.
sector in front of vehicle cab) the limiting device can be provided with a special
function which allows to operate with a reduction of the intervention level.
The reduction of the intervention level reduces the crane capacity values and
this reduction value is defined in the vehicle stability calculation.
Consequently the working area is divided in one sector (e.g. body side) where
the crane works according to the capacity plate values and another sector
(e.g. cab side) where it works with reduced capacity values. The device has
consequently two intervention levels which are activated in relation to the sec-
tor of the crane working area always securing the vehicle stability.
(!) ATTENTION (!)
If the rotation stops by going through the working zone where the crane can
operate according to the capacity plate values to the one where it can operate
according to the reduced values, it means that one of the following conditions
is reached:
- manoeuvre of a load bigger than the one admitted in the reduced sector
defined in the vehicle stability calculation
- manoeuvre without load with (at least) one of the inner, outer rams of the
crane or the jib (if fitted) extended till the stroke end.
The only manoeuvre allowed is the crane rotation in the reversed sense, and
consequently, an action which respectively allows to reduce the moment or to
re-enter the inner ram(s), the crane outer ram, the jib outer ram (if fitted).
H1.2
CONTROLS TO
OPERATE THE CRANE
F 170A
25
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