Effer DMU 2000 - Page 32

Electronic device DMU2000 - DMU3000 - DMU3000 PLUS
THE POWER OF PERFORMANCE
32
Electronic device DMU2000 - DMU3000 - DMU3000 PLUS
C) BASIC CRANE, WITH THE SECOND BOOM THAT UP-
LIFTS
ANALOG ANGLE SENSOR ON SECOND BOOM (type 2)
Adjusting type c) angle sensor:
Using the menu “Pressure gauges and working angle “
next to the words “alpha 2” 0 should appear when the
boom is in horizontal position, and – 90° by placing the
second boom in vertical position and turned down-
wards.
To comply with the data referred to above, you must in-
tervene mechanically on fastening of the sensor to crane
boom.
d) BASIC CRANE, WITH THE SECOND BOOM THAT UP-
LIFTS, BUT EQUIPPED WITH ADDITIONAL JIB
ANALOG ANGLE SENSOR ON BOTH SECOND BOOM AND
JIB (both type 2)
The function of these sensors, is not only to discriminate
crane operation when the load limiting device on the
basis of geometric conguration of the booms comes
into operation, but also to limit the opening movements
of cylinders that operate the crane booms when you
reach congurations at safety limits: a typical example,
is to avoid going beyond the crane verticality following
an opening manoeuvre of boom handling cylinders.
Adjusting type d) angle sensor:
using the menu “Pressure gauges and working angle “ next to the words “alpha 2” 0 should appear
when the boom is in horizontal position, and - 90° by placing the second boom in vertical position and
turned downwards.
Using the same menu next to the word “Delta” 0 should appear when the jib boom has a position aligned
with the basic crane second boom. If a jib opening manoevre is carried out, negative values must be
highlighted, vice versa, if a closing manoevre is carried out, positive values must be highlighted.
Only for the analog sensor tted to additional jib another very important test is the adjustment of
the opening maximum angle, to prevent the load limiting device from coming into operation after
the maximum pressure value is reached inside the cylinder (the DMU would have the maximum load
applied to jib). If a maximum jib opening manoeuvre is carried out, the load limiting device must not
come into operation.