Bosch Rexroth VT-MRMA1-1, Руководство по эксплуатации

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20/52 About this product
Bosch Rexroth AG , VT-MRMA1-1, RE 30214-B/03.2019
Table 19: Fault detection
Purpose Effect in the event of a fault Setting
Fault detection for certain
signal cables and internal
processes. Output stage is deactivated.
“Ready-for-operation” output
is switched to 0 V and the
green LED on the front panel
goes out. None
The fault detection function monitors:
• Cable break of the pressure command value cables
• Exchanged pressure command value cables
• Cable break of the position transducer connecting cables
• Short-circuit of the position transducer supply cable with L0
When a new pressure adjustment process is being initiated, the following faults are
detected via the protective motor circuit (see “Protective motor circuit“ below):
• Exchanged motor cables (positive feedback)
• Jamming of the valve actuator
• Cable break of motor cables
When no fault is present, the green LED for readiness for operation lights up on
the front panel and the ”ready-for-operation” output is connected to the 24 V
operating voltage.
After the fault was rectified, the electronics can be re-activated by resetting and
then setting the ”enable” again.
The protective motor circuit is an integral part of the fault detection feature (see
page 20).
Table 20: Protective motor circuit
Purpose Effect Setting
Ensures proper operation
of the valve actuator by
monitoring the time required
for adjusting the position. When the max. permissible
adjustment time (max. 4 sec)
is exceeded, the output stage
is deactivated, the green
LED on the front panel of the
module goes out, and the
”ready-for-operation” output is
reset to 0 V. None
Example of faults, in the case of which the protective motor circuit responds:
• Jamming of the valve actuator
• Positive feedback as a result of exchanged motor cables
• Motor cable break
The protective motor circuit detects these faults only when a new pressure
adjustment process is being initiated.
Fault detection (8)
Protective motor circuit