VEGA VEGATOR 636 Ex - Manual (Page 21)

21
7 Maintenance and fault rectification
VEGATOR 636 Ex • Signal conditioning instrument
45508-EN-130627
7 Maintenance and fault rectification
7.1 Maintenance
If the instrument is used properly, no special maintenance is required
in normal operation.
7.2 Rectify faults
A maximum of reliability is ensured. Nevertheless, faults can occur
during operation. These may be caused by the following, e.g.:
•
Measured value from sensor not correct
•
Voltage supply
•
Interference on the cables
The first measure to be taken is to check the input and output signals.
The procedure is described as follows. In many cases the causes can
be determined this way and faults can be easily rectified.
Should these measures not be successful, please call in urgent cases
the VEGA service hotline under the phone no. +49 1805 858550.
The hotline is available to you 7 days a week round-the-clock. Since
we offer this service world-wide, the support is only available in the
English language. The service is free of charge, only the standard
telephone costs will be charged.
Error Cause Rectification
The red failure control
lamp (LED) of the signal
conditioning instrument
lights
Sensor not connected cor-
rectly
– In Ex systems, make sure that the Ex protection is not
influenced by the measuring instruments used.
– Measure the current value on the signal cable to the
sensor
– Faults on the sensor causing a current change below
3.7 mA or above 21 mA, cause a fault signal on
measuring instruments.
Sensor not connected cor-
rectly
– In Ex systems, make sure that the Ex protection is not
influenced by the measuring instruments used.
– Measure the voltage on the connection cable
– The terminal voltage of the sensor is at least 12 V in
normal condition
Failure reasons
Fault rectification
24 hour service hotline
Fault