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INFORMATION Staff members, agents V 35
Hydraulic pumps A 11 VO SHE, VVW 2005 / 09
CHECKING AND ADJUSTING THE REGULA-
Danger from rotating drive shafts and
TION START (8 BARS) OF THE DELIVERY
hot parts of the machine.
RATE CONTROL
Secure the machine against unautho-
These instructions are applicable to combinations rized or inadvertent starting.
consisting of two A 11 VO pumps,
Both pumps are adjusted independently. For the
– Nominal size 190 / 130 and
adjustment, only the pump to be adjusted is to be
connected to the delivery rate control.
– Nominal size 130 / 130.
– Check the settings when the hydraulic system
is at operating temperature.
Important:
Since one month, the pumps are delivered with – Detach the line from port 'Y' of the second
the regulation start set to the new value, i.e.: regulator (Fig. 1).
A11VO190 from serial no.: 21006318
– Close the line with a suitable screw plug.
A11VO130 from serial no.: 21034174
For these pumps, the settings must be checked The port on the regulator must remain open
and the electrical accordingly adapted. in order to prevent a pressure build-up in
the control chamber!
Take the necessary precautions to prevent
ATTENTION: dirt from getting into the regulator.
RISK OF ACCIDENT AND DAMAGE
The work described below may only Example: Nominal size 190 + 130
be performed by qualified personnel.
For this reason, the present description
does not repeat basic working steps.
Perform the adjustments only when the
engine is stationary and wear suitable
protective clothing.
Fig. 1
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– Detach the connector of the electrical delivery Delivery rate control valve:
rate control from the delivery rate control valve (single-circuit / double-circuit hydraulics)
(Fig. 1 resp. 2).
– Connect a test pressure gauge to the delivery
rate control valve:
Fig. 1: minimess port 'MX 1' or
Fig. 2: minimess port 'MY'
Single-circuit / double-circuit hydraulics (Fig. 1):
– Set lever 4 to the 'EMERGENCY OPERATION'
position
– Detach the line at port 'PZ' (only single-circuit
hydraulics or 636L–MPS) and close the port
and the line with suitable screw plugs. Fig.1
– Use the emergency control to adjust a control
pressure of 8 bars. Delivery rate control valve - double-circuit hydrau-
lics: (S 31, KVM 32XL, KVM 34X, S 39, S 58)
To do so, turn out spindle 3 completely until the
pressure gauge indicates 8 bars.
Double-circuit hydraulics(Fig. 2):
– When a limit stop dampening system is installed,
shut off the dampening function with the ball-
cock.
– Use the emergency control to adjust a control
pressure of 8 bars.
For this purpose, check that spindle 3 is turned
out completely, then screw down until the pres-
sure gauge indicates 8 bars.
– Check the stroking rate of the machine. In ma- Fig. 2
chines equipped with a VECTOR control sys-
tem, the stroking rate is directly indicated on
the display.
When checking the stroking rate, the operating
pressure of the machine should be between 50
and 100 bars.
– Shut off the concrete pump and the engine.
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– Check that the regulation sets in at 8 bars and – Restart the concrete pump and check the strok-
readjust, if necessary, with the setting screw ing rate.
beside the 'Y' port of the regulator (Fig. 1 or 2).
If the stroking rate is now slightly (max. 1 stroke)
Observe the different locations of the setting lower than the rate measured before, the
screws. regulation start setting is correct (control pres-
sure at 'Y' above 8 bars).
Important note:
If not, shut off the concrete pump and the en-
In the future, the pumps of nominal size 190 will gine and repeat the adjustment.
also be supplied with regulators with lateral set-
ting screw. – Repeat the procedure until the regulation start
has been set to the correct value.
The setting screws must be readjusted in very
small steps (max. ¼ turn at a time). Make sure
not to change the setting when tightening the A11VO130, small setting screw on the side:
lock-nut.
Adjustment of the regulation start is different
for both pumps and must be performed as fol-
lows:
Small setting screw at the side (Fig. 1):
regulation start too screw must be turned out
low (below 8 bars):
regulation start too screw must be turned in
high (above 8 bars):
Fig. 1
Big setting screw in front (Fig. 2):
A11VO190, big setting screw in front
regulation start too screw must be turned in
low (below 8 bars):
regulation start too screw must be turned out
high (above 8 bars):
Fig. 2
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For checking:
(the values are not the exact values, but only
tendencies)
– The value measured at port 'M1' of the hy-
draulic pump (Fig. 1) should now be approx.
0-2 bars at maximum delivery rate.
Beyond 4 bars at port 'Y', the pressure at M1
rises proportionally.
Beyond 8 bars at port 'Y' as measured at
'MX1' (Fig. 2) or 'MY' (Fig. 3), the pressure at
port 'M1' of the hydraulic pump (Fig. 1) now
corresponds to approx 1/3 of the high pres-
sure and continues to rise.
Fig. 1
This is a sign that the pump swivels back and
that the delivery rate reduces. Delivery rate control valve – single-circuit hydraulics:
The high pressure value can be measured at (single-circuit hydraulics / double-circuit hydraulics)
port 'M' (Fig. 1) of the hydraulic pump or at the
concrete pump pressure gauge.
Example: 'M' = 180 bars / 'M1' = approx. 60 bars.
– Reconnect the line to port 'Y' of the regulator
and detach the line from the second pump al-
ready adjusted.
– Repeat the adjustment procedure for the sec-
ond pump.
– Finally, set the spindles of the emergency con-
trol back to their basic position.
Fig. 2: Fig. 2
– Turn down spindle 3 completely and lock.
Delivery rate control valve – double-circuit hydraulics:
– Reconnect the line detached beforehand to (S 31, KVM 32XL, KVM 34X, S 39, S 58)
port 'PZ' (single-circuit hydraulics or 636L–MPS
only).
– Switch lever 4 to the 'NORMAL OPERATION'
position.
Fig. 3:
– Turn out spindle 3 completely, tighten the lock-
nut and screw the cap nut back in place.
– If the machine is equipped with a limit stop
dampening function, switch this function on
again with the ballcock
Fig. 3
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In a last step, the required parameters must be B) "DRE–4" valve (Fig. 2)
programmed into the concrete pump control.
With this valve it only necessary to check whether
Like the other work, this work, too, may only the minimum and maximum delivery rate can be
be performed by qualified personnel! adjusted.
A) "Command-Control" valve (Fig. 1) If necessary, change the entered value and the
maximum current.
The following values have been determined as
being necessary: This change can also be made with keys F1 resp.
F2 in the terminal program as described above.
a) PWM* frequency : 100 Hz
b) Regulator P- factor : 0.25 Delivery rate control valve: Command-Control
c) Regulator I- factor : 0.040
The highest max. current possible for the delivery
rate control valve is 1300 mA.
The values a), b), and c) must be set by means of
the terminal program.
< F1 > PARAMETERS (set values)
display / edit
< F2 > Concrete pump control
(page 1 of 2)
For changing the values, an authorization as Fig. 1
– RECEPTION,
Delivery rate control valve: DRE–4
– MASTER or
– Terminal programm 1.2
is required.
Check after the adjustment whether the pump can
be adjusted with the electrical delivery rate control
to maximum and minimum delivery rate.
If this is not the case, determine the values for the
entry current and the maximum current by the
usual procedure and enter them into the control.
Fig. 2
PWM* = Pulse-Width-Modulation
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