VEGA VEGADIS 175 - Manual (Page 16)

7 Maintenance and fault rectification
7 .1 Maintenance
If the instrument is used properly, no special maintenance is required
in normal operation.
7 .2 Remove interferences
VEGADIS 175 offers maximum reliability. Nevertheless, faults can
occur during operation. These may be caused by the following, e.g.:
l Sensor
l Process
l Voltage supply
l Signal processing
The first measure is to check the sensor output signal according to the
operating instructions manual of the respective sensor. In many cases
the reasons can be determined this way and faults rectified. System
errors of VEGADIS 175 are displayed via the system error message of
the following chart:
Connect a handheld multimeter in the suitable measuring range
according to the wiring plan.
? 4 … 20 mA signal missing
l Wrong connection to voltage supply
à Check and correct, if necessary, according to chapter "Wiring
plan"
l No power supply
à Check cables for breaks; repair if necessary
l Operating voltage too low or load resistance too high
à Check, adapt if necessary
In Ex applications, the regulations for the wiring of intrinsically safe
circuits must be observed.
Errors occurring during the self-test or operation are immediately
shown on the display. Messages to be acknowledged are immediately
deleted after key pressing.
Failure reasons
Fault rectification
Check the 4 … 20 mA
signal
System error message
16 VEGADIS 175
7 Maintenance and fault rectification
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