Operation - Bosch Rexroth 50 NFF2 Operating Instructions Manual

18/30 Bosch Rexroth AG

Operation

CAUTION!
8 Operation
Make sure that the off-line filter system is not operated unattended.
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Observe the vacuum meter. If the pressure exceeds 2.5 bar, the machine is
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switched off automatically and a fault is displayed at the control box (fig. 3,
item 5). The filter cartridge has to be exchanged (chapter "9.5 Exchanging the
filter cartridge").
The pump must not run dry for more than 30 seconds. Switch off the pump at
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the on/off switch at the control box.
The vacuum meter monitors the pump's suction pressure. It should be within the
range of -0.5 - 0 bar (fig. 6). If the suction pressure falls below –0.5 bar, there is a
risk of cavitation.
Fig. 6: Vacuum meter
Risk of cavitation!
Cavitation leads to early pump wear. Symptoms of cavitation include knocking
sound in the pump and/or excessive vibrations of the entire unit.
Remedy the cause for the excessive pressure resistance in the suction line.
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Clear a plugged pipe socket and/or a plugged suction line from the plugging.
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If the oil viscosity is too high or the oil temperature is too low, the operating con-
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ditions (chapter "15 Technical data") have not been complied with. In this case,
precautions have to be taken in order to comply with the operating conditions.
Renew or clean a contaminated filter (chapter "9.5 Exchanging the filter element").
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30, 50, 80 NFF2 | RE 51433-B/04.10