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Fault detection for
Pressure command value
cables (2 cables)
14 Troubleshooting
14.1 How to proceed for troubleshooting
• Always act systematically and focused, even under pressure of time. Random and
imprudent disassembly and changing of settings might result in the inability to
ascertain the original cause of fault.
• First obtain a general overview of how your product works in conjunction with the
entire system.
• Try to determine whether the product worked properly in conjunction with the
entire system before the troubles occurred.
• Try to determine any changes of the entire 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: Which?
– Was the product or machine used as intended?
– How becomes the malfunction apparent?
– Try to get a clear idea of the error cause. If possible, ask the direct (machine)
operator.
14.2 Erroneous states and error diagnostics
Various monitoring functions are active in the amplifier module.
When no error is present
• the green "ready" LED is ON
• 24 V operating voltage is applied to the "ready" output (terminal 10)
In the event of a fault, the fault detection feature provides information on the
possible causes of the fault:
Fault
Cable break (at 0...10 V
input)
Cable break or short-circuit
(at 4...20 mA input)
Effect
Output stage switches off
"Ready for operation" and, if applicable,
"Position command value reached" become
inactive (0 V)
The green "ready" LED is OFF
Pressure switch signals A or B becomes
inactive
RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG
Troubleshooting
45/52
Remedy
Replace cable
Replace cable
Check pressure command
value connections
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