VEGA VEGATOR 537 Ex - Manual (Page 14)

14 VEGATOR 537 Ex
23465-EN-030723
Diagnosis
5 Diagnosis
5.1 Recurring test acc. to WHG
The implementation of the recurring test acc.
to WHG is regulated in the general type ap-
proval no. Z-65.11-154, Z-65.11-285 (see
item 8 of the certificate).
Please give attention to these higher-priority
approvals when VEGASWING 81A and 83A
are used as part of an overfill protection
system acc. to WHG.
VEGASWING 61Ex, 63Ex, 81AEx and 83AEx
with signal conditioning instruments
VEGATOR 536 Ex, 537 Ex, 636 Ex meet in
mode A (overfill protection the fail safe re-
quirements acc. to AK 3.
Recurring test acc. to WHG
In accordance with the type approval acc. to
WHG (no. Z-65.11-154, Z-65.11-285) the
recurring test acc. to WHG can be carried
out by pushing the test key on the VEGATOR
536 Ex, 537 Ex, 636 Ex signal conditioning
instrument. The sensor must neither be re-
moved, nor must a response be triggered by
filling the vessel. This applies to
VEGASWING 61Ex, 63Ex, 81A Ex and
83A Ex with SW E60ZEx, SW E82ZEx two-
wire oscillator.
The implementation and the switching se-
quence of the function test is stated under
"Test key" and the accompanying table in the
operating instructions of the respective
VEGATOR signal conditioning instrument.
28
30
32
+
–
+
–
+
–
mA V
4 … 20 mA 12 … 20 V
Sensor
VEGATOR
series 500
5.2 Failure rectification
Failure Corrective measure, failure rectification
The red fault signal Check the sensor inputs for the following causes of failure:
LED of the signal - short-circuit on the input
conditioning instru- - incorrect connection of the sensor
ment lights - sensor cable interrupted
- sensor voltage too low
Check if the sensor is connected correctly.
- failures in the sensor, effecting a current change to below 2 mA or
above 23 mA, will cause a fault signal on the signal conditioning in-
strument.
Measure the current on the connection cable to the sensor.
The terminal voltage of the sensor in normal condition is at least 12 V.
In Ex systems, make sure that the Ex protection is not degraded
by the measuring instruments.