VEGA VEGATOR 121 - Manual (Page 16)

16
7 Maintenance and fault rectification
VEGATOR 121 •
46107-EN-131217
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 in 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.
Depending on the reason for the fault and the measures taken, the
steps described in chapter "Set up" may have to be carried out again.
Cause Rectification
Sensor not connected
correctly
– In Ex systems, make sure that the Ex protection
is not influenced by the measuring instruments
used.
– Measure the current and voltage on the connec-
tion cable to the sensor
– Faults in the sensor causing a current change to
below 3.6 mA or over 21 mA lead to a fault signal
in the signal conditioning instruments.
– The terminal voltage of the sensor is at least 12 V
in normal condition
Sensor delivers no (cor-
rect) switch-on pulse
– Use sensor with switch-on pulse (VEGASWING/
VEGAWIB/VEGAWAVE)
– Deactivate switch-on pulse monitoring
Failure reasons
Fault rectification
24 hour service hotline
Reaction after fault recti-
fication
Red fault LED lights