VEGA VEGAMET 381 Ex - Manual (Page 29)

29
7 Maintenance and fault rectification
VEGAMET 381 Ex • 4 … 20 mA signal conditioning instrument
30418-01-131025
switches off when the value falls below this
value. The respective relay control lamp
lights when the relay is energized. If the
switching points are too close together
(< 0.1 %), the appropriate LED flashes. The
relay takes on the safe condition. In mode
"OPERATE " an error message is outputted
on the display.
•
If you want to control additional relays, pro-
ceed in the same way, as with relay 1. The
switch positions for setting the respective
relays are stated in the list of the function
switch under "Setup procedure".
Hinweis:
If you want to change the mode (i.e. the
switching function of the relays), you
have to exchange the On and Off values.
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
Failure reasons
A maximum of reliability is ensured. Neverthel-
ess, 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
Fault rectification
The first measures to be taken are to check the
input/output signals as well as to evaluate the
error messages via the display. The procedure
is described below. In many cases, the causes
can be determined in this way and faults can be
rectified.
24 hour service hotline
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.
Fault message
The signal conditioning instrument and the
connected sensors are permanently monitored
during operation and the values entered during
parameter adjustment are checked for plausibi-
lity. If irregularities occur or in case of incorrect
parameter adjustment, a fault signal is triggered.
In case of an instrument defect or line break/
shortcircuit, a fault signal is also triggered.
The fail safe relay deenergises in case of failure,
the failure indication lights and the current
output jumps to 22 mA. In addition, one of the
following fault messages is outputted on the
display.
Error messages
Fehlercode Ursache Beseitigung
E003 CRC error (error
with self-check)
Carry out a reset
Send instrument for repair
E014 Sensor current
> 21 mA or short-
circuit
Check sensor, e.g. on failure
Remove short-circuit
E015 Sensor in boot
phase
Sensor current
< 3.6 mA or line
break
Check sensor, e.g. on failure
Remove line break
Check connection of the sensor
E016 Empty/full adjust-
ment reversed
Carry out a fresh adjustment