Fault Table - Bosch rexroth SYDFED 2X Series Manual

Table 28: Fault table of SY(H)DFED control systems
Malfunction
Message "analog input, wire
break" at actual pressure value
input
Message "Wire rupture of
swivel angle sensor"
Message "Valve error pump
controller" (deviation between
command and actual position
of the valve spool)
Message "Control deviation
pump controller"
Humming noise in the pressure
control or fluctuations in
pressure/flow
Screaming noise
Troubleshooting | SYDFED-2X, SYDFED-3X, SYHDFED-1X
15.3

FAULT TABLE

Possible cause
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.
Defective swivel angle sensor cable (visual
inspection)
Defective swivel angle sensor
Internal electronics fault
Valve spool jams due to contamination
Internal electronics fault
Backpressure cannot be built up (minimum
pressure at the pump 8...10 bar)
Drive motor switched off or speed too low
Valve spool does not move as a result of
electronics fault
Valve spool jams due to contamination
Air cushion around the sensor
Problem with the cable shield
Incorrect protective earth connection in the
control cabinet
No connection from M0 to L0
Unfavorable place of installation/mounting
technique for the pressure transducer
Improperly high gain of the actual pressure
value
Oil level in the tank too low; pump partly
aspires air
Pump aspires air
Suction line leaky
Pump cavitates when pressure is reduced
Diagnostics: Measure, whether the pressure in
the pressure line overshoots
Fluid in the tank mixed with air; cooling and/or
filtration circuit leaky
Remedy
Test actual pressure value signal (wire
rupture, working range, signal type,
polarity)
Replace swivel angle sensor
Replace swivel angle sensor
Have the pilot valve repaired by Rexroth
Service or replace pilot valve
Replace pilot valve (see page 76),
contact Rexroth Service
Replace pilot valve, see page 76
Check that the hydraulic system is
leak-free and there is no excessive oil
consumption
Check electrical control and motor control
Replace pilot valve, see page 76
Replace pilot valve (see page 76),
contact Rexroth Service
Bleed control system, pre-load valve (see
chapter 8.1.7 on page 65) and pipes
completely
Connect shield to ground
Properly connect protective earth
connector
Connect M0 (XH4, pin 4) and L0 (XH4, pin
2) in the control cabinet
Change place of installation (e.g.
suspended mounting, no minimess line,
no throttling point between pump and
pressure transducer), see page 57.
Reduce P-gain, see chapter 8.1.8.1 on
page 66
Top up oil
Change routing of the suction line
Seal suction line
Optimize controller, reduce the command
value via a ramp or in steps
Seal
RE 30017-B, Edition 11.2021, Bosch Rexroth AG
83/96