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54/60 Troubleshooting
Bosch Rexroth AG, VT-VPCD, RE 30028-B/09.13
Error message Description
LVDT1 Fault 2
Short-circuit in the supply of the valve position transducer (z18)
LVDT1 Fault 3 Cable break in the supply of the valve position transducer (z18, z12) or
short-circuit in the reference potential of the supply (z12)
LVDT2
Fault 1 Cable break in the secondary branch of the pump swivel angle transducer
(f22, f24)
LVDT2
Fault 2 Short-circuit in the supply of the pump swivel angle transducer (f26)
LVDT2
Fault 3 Cable break in the supply of the pump swivel angle transducer (f26, f20) or
short-circuit in the reference potential of the supply (f20)
Short Cir. Sol a+b Short-circuit in the connection of solenoid a (z2, z4) or solenoid b (z6, z8)
Bus Fault Profibus: The slave has left the state “DATA_EXCHANGE“.
CANopen: The node has left the state “OPERATIONAL“.
DeviceNet: The node has left the state “ONLINE“.
14.3 Changing the fuse
The control electronics is protected against overvoltage by means of a fuse. The fuse
is a single-use fuse with the following data:
t F / 4 A / 250 V
The fuse can be blown for two reasons:
1. Blowing can be traced back to material fatigue or a product defect.
▶ In this case, replace the fuse with a new one of the above-mentioned type.
2. The fuse is blown due to external effects, i.e. components or parts connected to
the control electronics.
▶ In this case, carry out a diagnosis and remedy the fault that caused the fuse to
blow.
Only then should a new fuse be installed.
How to replace the fuse of the control electronics VT-VPCD:
1. Remove the VT-VPCD control electronics from the card holder (reverse of the
procedure described in Chapter 7.5 „Installing the VT-VPCD“ on page 30).
2. Gently remove the fuse from the fuse holder without applying any force. See
Figure below.
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