17
7 Maintenance and fault rectification
VEGATRENN 149A Ex • Ex-separator for 4 … 20 mA/HART
24816-01-151103
Designation Terminal assign-
ment
Input and
output
L/+
L (AC), + (DC)
Voltage supply
N/-
N (AC), - (DC)
Voltage supply
Grounding
Protective conduc-
tor PE
Voltage supply
O+
O-
O+H
Measuring
Measuring signal -
Measuring
with HART resistor
Measuring sig-
nal processing
circuit "
Non-Ex
area
"
I+
I-
Measuring signal
intrinsically safe +
Measuring signal
intrinsically safe -
Measuring sig-
nal sensor circuit
"
Ex-area
"
VEGA-
CONNECT
HART communica-
tion sockets
HART
handheld or VE-
GACONNECT
6 Setup
6.1 Operation
There are no adjustment elements on VEGAT-
RENN 149A Ex. Via the HART communication
sockets in the front, a parameter adjustment of
the connected HART sensors can be carried
out without interrupting the measuring circuit.
The resistor (250 Ω) required for this purpose
is already integrated in VEGATRENN 149A
Ex (only in case of connection of
O+H
). The
adjustment is carried out via a Windows PC with
a parameter adjustment software such as e.g.
PACTware and respective DTM.
6.2 Indication of the function
The yellow LED in the front plate of VEGAT-
RENN 149A Ex lights as soon as a signal
processing system is connected to the output
and a current of > 2 mA flows.
on
CONNECT
149A Ex
0+H
0+
0-
1
2
Abb. 13: Function indications and HART sockets
1 LED: indication of the function
2 HART communication sockets
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
Causes of malfunction
Maximum 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
Fault rectification
The first measure to be taken is to check the
input/output signal as well as the power supply.
In many cases, the causes can be determined
and faults can be quickly 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 manned 7 days a week round-
the-clock. Since we offer this service worldwide,
the support is only available in the English
language. The service is free, only standard call
charges are incurred.
7.3 Instrument repair
If a repair is necessary, please proceed as
