How To Proceed For Troubleshooting - Bosch rexroth SYDFE1 2X Series Operating Instructions Manual

84/96 Pressure and flow control system SYDFE1 series 2X, 3X | Troubleshooting
After having rectified the
fault
Bosch Rexroth AG, Edition 10.2021, RE 30011-B
Should one of the two above-mentioned individual faults be present, check,
whether too high a load or possibly a short-circuit is present at outputs 20a (-15V)
and 24a (+15V).
▶ Check auxiliary voltages at control electronics VT 5041-3X (reference = 22a)
– Female multi-point connector 20a = -15 V (-14.1 V...-15.3 V)
– Female multi-point connector 24a = +15 V (+14.1 V...+15.3 V)
Should the pump generate pressure in an uncontrollable manner without a fault
signal being issued by control electronics VT 5041-3X, check the control valve VT-
DFP-... for "jamming".
▶ Unplug solenoid connector
▶ Measure actual valve value at socket 6
With a non-jammed valve, the actual valve value (test jack 6) must now be
within the range of +10 V to +15 V. Otherwise, the valve is likely to jam.
▶ Replace valve
▶ Switch the voltage off and on (clearing of the fault signal)
▶ If the fault signal is no longer present, switch the pump off
▶ Activate the motor fuse
▶ Switch the pump on
15.1

HOW TO PROCEED FOR TROUBLESHOOTING

▶ Always work systematically and purposefully, even when under time pressure.
Random and imprudent disassembly and changing of settings can, in the worst-
case scenario, result in the inability to determine the original cause of error.
▶ First obtain a general overview of how your product works in conjunction with
the entire system.
▶ Try to find out whether the product has functioned properly in conjunction with
the overall system before the fault occurred.
▶ Try to determine any changes of the overall system in which the product is
integrated:
– Were there any changes to the product's operating conditions or operating
range?
– Were there any changes (e.g. retrofit) or repairs carried out on the complete
system (machine/system, electrics, control) or on the product? If yes: What
were they?
– Was the product or machine used as intended?
– How did the fault become apparent?
▶ Try to get a clear idea of the cause of error. If possible, ask the direct
(machine) operator.
▶ If you cannot rectify the error, contact one of the contact addresses which can
be found at:
www.boschrexroth.com/addresses