Bosch REXROTH A4VSO User Manual

92/104 Troubleshooting
Bosch Rexroth AG, A4... with HS5E pilot control valve/Series 3x, RE 92076-01-B/10.2017
Table 26: Axial piston unit malfunction table
Malfunction Possible cause Remedy
Excessive temperature of
hydraulic fluid and housing
Excessive inlet temperature at the axial piston
unit
Machine/system manufacturer: inspect system,
e.g. malfunction in the cooler, insufficient
hydraulic fluid in the reservoir
Wrong setting or malfunction of the pressure
relief valve and the pressure control valve
(e.g. pressure controller)
Optimize the adjustment of the pressure relief
and pressure control valves of the axial piston
unit and the pressure limitation in the hydraulic
system
Contact Bosch Rexroth Service
Contact machine/system manufacturer
Axial piston unit worn Replace axial piston unit, contact Bosch
Rexroth Service
Table 27: Malfunction table of HS5E control systems
Malfunction Possible cause Remedy
Message “analog input, wire
break” at actual pressure value
input
Actual pressure value of the relevant pressure
transducer fell below or exceeded the limit value,
that is, the value is outside the permissible
measuring range of the A/D converter.
Test actual pressure value signal (wire rupture,
working range, signal type, polarity).
Message “Wire rupture of swivel
angle sensor”
Defective swivel angle sensor cable (visual
inspection)
Replace swivel angle sensor
Defective swivel angle sensor Replace swivel angle sensor
Internal electronics fault Have the pilot valve repaired by Rexroth
Service or replace pilot valve
Message “Valve error pump
controller” (deviation between
command and actual position of
the valve spool)
Valve spool jams due to contamination Replace pilot valve, see chapter"10.5.1"
on page82
Internal electronics fault Replace pilot valve, see chapter"10.5.1"
on page82
Message “Control deviation pump
controller”
Backpressure cannot be built up (minimum
pressure at the pump 8...10 bar)
Check that the hydraulic system is leak-free
and that the withdrawal is not excessively high
Drive motor switched off or rotational speed too
low
Check electrical control and motor control
Valve spool does not move as a result of
electronics fault
Replace pilot valve, see chapter"10.5.1"
on page82
Valve spool jams due to contamination Replace pilot valve, see chapter"10.5.1"
on page82
Humming noise in the pressure
control or fluctuations in
pressure/flow
Air pocket around the sensor Bleed control system, pump (see 8, on
page 60) and pipes completely
Problem with the cable shield Connect shield to ground
Incorrect protective earth connection in the
control cabinet
Properly connect protective earth connector
No connection from M0 to L0 Connect M0 (XH4, pin 4) and L0 (XH4, pin 2)
in the control cabinet
Unfavorable place of installation/mounting
technique for the pressure transducer
Change installation location (e.g. suspended
mounting, no Minimess line, no throttling point
between pump and pressure transducer), see
page 42
Improperly high gain of the actual pressure
controller
Reduce P-gain, see Chapter 8.1.7.2 on page 71

Bosch REXROTH A4VSO Specifications

General

Brand	Bosch
Model	REXROTH A4VSO
Category	Water Pump
Language	English