Technical data

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16.2

CONTROLS TO

OPERATE THE CRANE

GR2_45»65_3_4_SE

16.2 "Electronic" lifting moment limiting device

This device utilises an electro-hydraulic system managed by an electronic

logic that prevents any operation tending to cause an increase in the pressure

induced by the load in the lifting rams (inner, outer rams of the crane and of

the hydraulic extension, if fitted), up to the critical values. These values, which

are not exceedable, determine the intervention levels and provide the data for

setting the device.

The pressure values detected in the lifting rams are turned into electric signals

by the transducers, and sent to the electronic logic of the device which deter-

mines the locking or unlocking of the controls concerned, according to the

horizontal position of the crane outer boom (mercury level switch); only the

controls allowing a reduction of the overload are enabled, while those increa-

sing it are disabled.

The device features an electro-hydraulic control that does not allow the set

value to be exceed, by deactivating the controls (levers in neutral position)

commanded by the limiting device. When the controls are released (levers in

neutral position) it's this electronic logic that handles which manoeuvres are

disabled, according to the position of the crane outer boom and in overload

condition, by sending electric signals to special micro-switches placed on the

elements of the distributor.

(!) ATTENTION (!)

The presence of the lifting moment limiting device does not release the

user from the obligation to respect what is indicated on capacity plates

and lifting curves.

16.3 Control panels

Layout of the control panel (fig. 17), placed next to the distributor of the crane

A - green, yellow and red led band signalling the load percentage as compared

to the capacity plate

Green light load between 0 and 90%

Yellow light load between 90 and 100%

Red light load higher than 100%

B - Display

C - Control buttons (4 control buttons)

D -

“STOP” button

E -

Audible alarm push button (danger)

F - Green warning light (electric on)

G - Control button for XP

H - Control button for the temporary exclusion

of the lifting moment limiting device

Layout of the control panel (fig. 18) (if fitted) placed on the double control side and

on top seat (version with hand-cable controls)

D -

“STOP” button

E -

Audible alarm push button (danger)

F - Green warning light (electric on)

G - Control button for XP

H - Control button for the temporary exclusion

of the lifting moment limiting device

If the green warning light F comes on, it confirms that the electric circuit is active.

!NOTE! In the absence of electric power all crane functions will be

desactivated.

If the yellow led A comes on during load handling, 90% of the capacity (lifting

moment) has been reached.

fig. 17

fig. 18