4. Installation instructions
page 25
EN
4.4 Control and monitoring
Oil + air lubrication systems are available in de-
signs with and without control units. The latter do
not contain an electronic control unit. This type of
oil + air lubrication system is controlled and moni-
tored by the control unit of the machine that the
system is mounted on. An oil + air lubrication
system with a control unit contains an electronic
control unit that is integrated into the compact unit
and controls and monitors the system.
4.4.1 Oil + air lubrication systems
without control unit
Oil + air lubrication systems without an integrated
electronic control unit are controlled by the control
unit of the machine that the system is connected
to. The machine control unit controls the pump's
cycle time and delay time and the compact unit's
interval time in accordance with the amount of
lubricant required by the lubrication points. The
pump cycle time is the duration from when the
gear pump motor is switched on until the maxi-
mum oil pressure is reached in the main lubricant
line, which is monitored by a pressure switch. This
period is also referred to as the monitoring time.
The pump delay time is a period during which the
gear pump motor continues to run after the maxi-
mum oil pressure is reached in the main lubricant
line. This period ensures that the metering cham-
bers in the oil + air metering unit are completely
emptied. The pump cycle and delay time is also
referred to as the contact time. The interval time is
the period between two contact times. A lubricating
cycle consists of the contact time and the interval
time.
Operating mode S3 for the gear pump motor is
used to define the interval time and the gear
pump's cycle time and delay time. Consult the
documentation of the oil + air lubrication system
for information about this operating mode.
The following are monitored:
)
Pressure build-up in the main lubricant line
(oil pressure build-up)
)
Minimum air pressure of the compressed air
supply
)
Fill level in the lubricant reservoir
With regard to monitoring pressure build-up in the
main lubricant line during a lubricating cycle, note
that several seconds may pass after the gear pump
motor is switched on before the oil pressure switch
responds. A fixed monitoring time for oil pressure
build-up is recommended so that the machine
control unit waits until this time has elapsed to
issue a fault notification if the required oil pressure
is not reached. A period of approx. 60 seconds is
recommended.
The oil pressure switch responds once the required
oil pressure has been reached.
If the required oil pressure is not reached, the
machine must be shut down to prevent underlu-
brication of the bearings.
In order to prevent underlubrication of the bear-
ings, monitoring of the minimum air pressure of
the compressed air supply must be configured in
such a way that the machine is shut down if the
required pressure is not reached or the pressure
drops excessively. Ensure that a time buffer is
stored in the machine control unit to level out brief
pressure fluctuations in the compressed air supply.
In order to prevent underlubrication of the bear-
ings, monitoring of the minimum fill level of the
lubricant reservoir must be configured in such a
way that the machine is shut down if the fill level is
too low.
Summary of Contents for OLA Series
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