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RE 51150-B/07.11 | Drive modules
Flushing temperature
Flushing duration
After flushing
For more complex hydraulic systems with ring and branch lines, the flushing
process must be planned in detail and undertaken with care.
This is imperative if piping within the system have been welded and possibly
also pickled.
The following statements assume that the flushing process is undertaken
using the drive module described in these operating instructions. When using
a separate flushing unit, it is imperative to observe the operating instructions
pertaining to this unit!
For flushing, the drive module has to be brought to operating temperature, if
possible, and operated with reduced pressure settings. Remember either to
deactivate any existing pressure monitoring circuits for the flushing phase or to
adjust them to the lower flushing pressures.
No generally valid statement can be made regarding the flushing duration. It is
recommended that oil samples be taken at periodic intervals during the flushing
process and then analyzed for cleanliness. Suitable sampling points include e.g.
the return line downstream from any existing return line filter. Depending on these
results the decision then has to be made as to whether the flushing operation
should be stopped (once the target cleanliness level has been attained)
or continued.
Only make operating pressure settings at the pressure valves intended for that
purpose.
Never change the setting of sealed valves or valves with a fixed factory
setting.
After completing the flushing process care should be taken to ensure that the
operating settings of the drive module are restored, that any flushing connections
are dismantled and connection lines sealed so as to be pressure-tight. When
replacing the flushing plates with original valves, these are to be assembled
according to manufacturer specification.
8.1.10
The most frequent errors during commissioning
•
The fluid level is not being checked.
•
The system is being filled with unfiltered hydraulic fluid.
•
The hydraulic system is not bled correctly.
•
Pressure relief valves are being set too close to the working pressure (closing
pressure difference is not being observed).
•
Pressure controllers of hydraulic pumps are being set higher than or equal to
the pressure relief valve.
•
Abnormal pump noises are not being observed (cavitation, leaky suction line,
too much air in the hydraulic fluid).
•
The switching hysteresis of pressure switches is not being considered in
the setting.
•
Before commissioning, the hydraulic pump and hydraulic motor housings are
not being filled with hydraulic fluid.
•
The settings are not being documented.
•
During commissioning, uninvolved personnel are staying in the vicinity of
the machine.
Bosch Rexroth AG
35/56
Commissioning
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