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Fig. 18 Adjusting the tuning
a minimum. On a double acting pump like the LPQ
pump, there are two tuning valves, which must be
adjusted individually.
Setting of tuning of the LPQ:
1. Before starting the setting check that both setting
screws (8 mm socket head cap screw on the
discharge side) are closed.
2. Turn the lower screw until the noise level obtains
a minimum.(If turned too much the noise will
increase again).
3. Turn the upper screw and continue to reduce
the noise level. (If turned too much the noise will
increase again).
4. Repeat item 2. and 3. in order to achieve the
lowest possible noise level.
Setting of tuning of the ACG/UCG and ACF/UCF:
1. Before starting the setting, check that the setting
screw (8 mm: ACG/UCG, 12 mm: ACF/UCF,
socket head cap screw on the discharge side)
are closed.
2. Turn the screw CCW until the noise level
becomes the lowest (if turned too much the noise
will increase again).
Once set, the tuning needs no further adjustment,
providing the operating conditions stay the same.
NOTE: It´ s not possible to accidentally turn the
tuning spindle too far.
!
If operating temperature exceeds 60°C
(149°F), appropriate measures to avoid
skin contact shall be provided.
!
Use hearing protections whenever high
noise can be expected from pump, motor
and/or environment.
ATTENTION
Don’t mix up with arrow for inlet and
outlet!
Starting
Check that all valves necessary for the operation
are fully opened in both discharge and suction lines.
The first time, the pump should be started with
the adjusting spindle of the pressure relief valve
tightened to half of the available turns (the valve
setting is increased when the spindle is turned
clockwise).
By monitoring the pressure gauge it can be
determined when the suction line is primed and
the pump begins to work. Should the pump not
operate normally soon after start, stop the pump
within half a minute. Start again after about 3-5
minutes (the shaft seal must have time to cool off)
and run for half a minute. This procedure may need
to be repeated a couple of times if the suction line
is extremely long. Should the pump still not work, it
must be assumed there is a problem in the system
that needs to be remedied. Check the suction line
calculation on page 5 and/or see ”Trouble shooting”,
page 10.
!
Pumps with external ball bearing
including grease nipple, must be
regreased after one hour of running, while
the pump is operating
Setting the pressure relief valve
To set the opening pressure;
Tighten the valve spindle by rotating clockwise
to the maximum extent. The system pressure is
regulated by throttling an external valve to required
value. The pressure relief valve is eased until the
pressure is just beginning to decrease by turning the
spindle CCW. The internal relief valve is now preset
for desired opening pressure. Open the throttling
external valve entirely.
As standard, the recommended valve setting is 1
bar above system pressure.
NOTE: The set screw on LPD is hidden behind a
plate.
Adjusting the tuning
The tuning adjustment, which is a standard feature
on ACF/UCF and LPQ (option on ACG/UCG pumps,
is a device for minimizing the effects of dissolved
and free air in lube oil systems. The tuning principle
is described in the Product Description.
The tuning should be adjusted while the pump is
working under normal operating conditions. This is
done by turning the tuning spindle with an Allen key
(size 8 mm for ACG/UCG , 12 mm for ACF/UCF and
LPQ ) to a position where the noise level comes to
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