Setup; Operation; Indication Of The Function; 7 Maintenance And Fault Rectification - VEGA VEGATRENN 149A Ex Betriebsanleitung

Designation Terminal assign-
ment
L/+ L (AC), + (DC)
N/- N (AC), - (DC)
Grounding Protective conduc-
tor PE
O+ Measuring signal +
O- Measuring signal -
O+H Measuring signal +
with HART resistor
I+ Measuring signal
intrinsically safe +
I-
Measuring signal
intrinsically safe -
VEGA- HART communica-
CONNECT tion sockets
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.
VEGATRENN 149A Ex • Ex-separator for 4 ... 20 mA/HART
Input and
output
Voltage supply
Voltage supply
Voltage supply
Measuring sig-
nal processing
circuit "Non-Ex
area"
Abb. 13: Function indications and HART sockets
Measuring sig-
1
nal sensor circuit
2
"Ex-area"
7
HART
handheld or VE-
GACONNECT
7.1
If the instrument is used properly, no special
maintenance is required in normal operation.
7.2
Causes of malfunction
Maximum reliability is ensured. Nevertheless,
faults can occur during operation. These may be
caused by the following, e.g.:
•
•
•
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
If a repair is necessary, please proceed as

7 Maintenance and fault rectification

1
on
CONNECT
149A Ex
0 + H 0 -
0 +
LED: indication of the function
HART communication sockets
Maintenance and fault
rectification

Maintenance

Rectify faults

Measured value from sensor not correct
Voltage supply
Interference in the cables

Instrument repair

2
17