62/76 Troubleshooting
Bosch Rexroth AG
, CytroPac, RE 51055-B/02.2021
15.1.1 Overview of the impact of defects
Table 9: Impact of defects
Fault
Possible cause
Remedy
Excessive noise level
Insufficient hydraulic fluid in the oil tank.
▶
Check the hydraulic fluid level.
▶
Check for and correct any leakage.
▶
As necessary, refill hydraulic fluid to ensure that
the fill level is between the markings on the fill
level indicator.
Hydraulic power unit is positioned on a
vibrating surface.
▶
Make sure that the hydraulic power unit is
positioned on a secure and non-vibrating surface.
The hydraulic power unit is connected to
the machine using pipes.
▶
Make the hydraulic connections between the
hydraulic power unit and the machine with flexible
hoses.
Pressure fluctuations in the
pressure line.
Vibration of the control system, e.g.
pressure controller
.
▶
Check the controller settings. You can find further
information in the commissioning instructions
51055-IB (see p/Q PID-control).
Incorrect operating pressure. Incorrect pressure command value
provision.
▶
You can find further information in the
commissioning instructions 51055-IB (see p/Q
PID-control).
Excessive pressure loss due to incorrect
dimensioning of flexible hoses.
▶
Replace the flexible hoses by flexible hoses of
larger nominal widths.
Pressure command value is
not reached or insufficient
flow.
Speed limit too low.
▶
As applicable, change the flow limitation parameter
F1.12. You can find further information in the
commissioning instructions 51055-IB (see flow
command value).
Overloading of frequency
converter in operation.
Drive insufficiently dimensioned.
▶
Make sure that the operating point is within the
characteristic curves. For further information on
characteristic curves, refer to data sheet 51055,
see chapter 1.2 "Required and supplementary
documentation".
Frequency converter
overload when disconnecting
hydraulic actuators.
Pressure relief valve (DBV) set too high.
▶
Make sure that the pressure relief valve is set 10 %
over the operating pressure.
Drive acts as generator (due to rotor
inertia).
▶
Extend the delay ramp.
You can find further
information in the commissioning instructions
51055-IB (see acceleration limitation).
Frequency converter over-
current when connecting
hydraulic actuators.
Motor current during acceleration too high.
▶
Extend the acceleration ramp. You can find further
information in the commissioning instructions
51055-IB (see acceleration limitation).
Overtemperature of drive
Insufficient cooling water flow, cooling
water temperature too high, insufficient
cooling water in the system, inlet pressure
too low or deposits in the heat exchanger.
▶
Make sure that the coolant complies with the
requirements of the technical specifications.
