2. Overview/System description
2.4 General design of a Dual Line centralized lubrication system with two main lines with one differential pressure switch each
)See Figure 5
The following description applies to a 400
VAC Dual Line centralized lubrication system
with two main lines.
The LMC 301 Controller (1) is installed in a
Dual Line control cabinet, with a load unit
and power supply for the pump motor and
the attached valves and sensors.
A grease feed line (4) and a grease return
line (3) are connected to the pump (2). Both
lines, the grease feed line and the grease
return line, are installed on the other end
to the electrical changeover valves (5/6) of
lines 1 and 2.
For each electrical changeover valve (EMU3)
(5/6), two main feed lines (7) (8) lead to
the Dual Line feeders (9) in downstream
alignment.
Once all feeders have dispensed their
quantity of lubricant (control and metering
pistons are in their end position), the first
half of the connected lubrication points in
section (A) or (B) has been supplied with lu-
bricant. The pressure builds further because
the pump continues to feed lubricant.
A model DDS50/1 differential pressure
switch (10) is fitted ahead of the last Dual
Line feeder. It contains two NO-contacts.
The differential pressure switch measures
the differential pressure between main feed
lines 1 and 2 (7/8).
A signal is sent to the LMC 301 Controller
when a differential pressure of ∆p = 50 bar
is reached.
The LMC 301 Controller then switches the
changeover valve (5), relieving the previous-
ly pressurized main feed line, while pressure
builds up in the previously relieved main
feed line. The control and metering pistons
of the feeders (9) are actuated once again
and lubricant is dispensed to the lubrication
points (12) or to the progressive feeders in
downstream alignment (13) on the opposite
side of the feeders, section (A) or (B).
Fill level monitoring is performed by an
ultrasonic sensor located in the pump res-
ervoir. The ultrasonic sensor (11) has two
switching points. When the minimum fill
level is reached, switching point 1 passes a
signal to the controller, which then switches
off the pump.When the maximum fill level is
reached, switching point 2 passes a signal to
the system control unit.
This makes it possible to operate an external
filling pump with both signals via the system
control unit.
A 2/2 directional control valve can be ad-
ditionally installed if multiple pumps (2) feed
the Dual Line centralized lubrication system.
It ensures that the pump assigned to each
line is relieved during the pressure relief
process.
EN
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