Kalmar ContChamp DRD S Series, Техническое руководство

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ContChamp DRD-S
Technical Handbook
ECU 2
50 Mechanical Overload Protection
58 S. Grupp 20
9407
04-10
Overload indicator
1. Normal operating condition.
2. Steering axle overload
Monitored by two inductive sensors, 24 for boom extension
and 21 for boom angle. When boom extension is less than
1.5 m, the boom angle is greater than 35° and 3rd or 4th gear
is engaged both sensors interrupt and generate an alarm for
overload of the steering axle. A red lamp blinks and the buzz-
er sounds intermittently.
3. With forward overload, i.e., when approximately 33% of the
safety margin remains (remaining counter-weight), the red
warning light on the ECS terminal lights up, a buzzer sounds
and the ECS terminal display shows “overload”. At the same
time, the system interrupts the LIFT, LOWER and BOOM
OUT functions. Of these, it is possible to make a by-pass
connection of the LOWER function, using the by-pass switch
on the side of the hydraulic console in the cab.
WARNING!
At any bypassing of the safety asystem, extreme care must
be taken when operating the machine.
The signal for forward overload is supplied by the sensor on the
steering axle suspension. The rear steering axle suspension in-
cludes a flexibly mounted hinged linkage with pre-determined
amount of “play”. When the permitted load is exceeded and the
steering axle is the only remaining counter-weight, this play in-
creases the distance between the sensor and the angle-iron that
activates the sensor. When this play is at its maximum, the sen-
sor’s signal ceases, an overload warning is generated and LIFT,
LOWER and BOOM OUT functions are interrupted while BOOM
IN works as usual.
This means that the machine may become locked in position. To
rectify such a situation it is possible to make a by-pass connection
with the help of the by-pass switch located on the side of the hy-
draulic console in the cab. Once the by-pass connection is made,
the BOOM IN and LOWER functions can be used.
Regeneration
Regeneration operates on the LIFT and BOOM OUT functions
and is a system that leads return fluid from the piston sides of the
lift and extension cylinders directly back to the cylinder feed. The
system is activated at hydraulic pressures lower than 8.5 MPa
and considerably increases the piston speed by increasing the
flow of hydraulic fluid. More rapid boom movement can thereby
be achieved on an unloaded machine. The greatest load which
will still allow the regeneration system to be activated is, for ex-
ample, an empty container in the first row. With a greater load,
LIFT and BOOM OUT function as normal.
The regeneration starts with a time delay which is set in the SET-
UP EL-SERVO menus, see Technical Handbook ECS SERVICE
End position damping
End position damping reduces the speed of LIFT/LOWER and
BOOM OUT/IN functions in order to reduce jolting at stop posi-
tions.
Sensors 22 for boom angle and 23a+b for boom extension are ac-
tivated before the end positions. The system feeds out less cur-
rent to the main valves which provide a reduced hydraulic flow
and thereby, a reduction in speed.
1.
2.
3.
1. Chassis
2. Angle-iron activator, activates sensor
Play > 5 mm sensor breaks
3. Hinged linkage
4. Steering axle
S20. Inductive sensor for overload
1
2
3
4
S20