RE 30017-B, Edition 11.2021, Bosch Rexroth AG
Troubleshooting |
SYDFED-2X, SYDFED-3X, SYHDFED-1X
83/96
15.3 FAULT TABLE
Table 28: Fault table of SY(H)DFED 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 page 76),
contact Rexroth Service
Internal electronics fault
Replace pilot valve, see page 76
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 there is no excessive oil
consumption
Drive motor switched off or speed too low
Check electrical control and motor control
Valve spool does not move as a result of
electronics fault
Replace pilot valve, see page 76
Valve spool jams due to contamination
Replace pilot valve (see page 76),
contact Rexroth Service
Humming noise in the pressure
control or fluctuations in
pressure/flow
Air cushion around the sensor
Bleed control system, pre-load valve (see
chapter 8.1.7 on page 65) 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 place of installation (e.g.
suspended mounting, no minimess line,
no throttling point between pump and
pressure transducer), see page 57.
Improperly high gain of the actual pressure
value
Reduce P-gain, see chapter 8.1.8.1 on
page 66
Screaming noise
Oil level in the tank too low; pump partly
aspires air
Top up oil
Pump aspires air
Change routing of the suction line
Suction line leaky
Seal suction line
Pump cavitates when pressure is reduced
Diagnostics: Measure, whether the pressure in
the pressure line overshoots
Optimize controller, reduce the command
value via a ramp or in steps
Fluid in the tank mixed with air; cooling and/or
filtration circuit leaky
Seal