VEGA VEGATOR 537 Ex - Manual (Page 13)

VEGATOR 537 Ex 13
23465-EN-030723
Test key
In systems with two-wire oscillators
(VIB E50 Z (Ex), SW E60ZEx, SW E82ZEx) a
function test can be carried out.
VEGATOR 536 Ex signal conditioning instru-
ment is equipped with an integrated test key.
The test key is set lowered into the front plate
of the signal conditioning instruments. Press
the test key with a suitable object (screw-
driver, pen etc.). If VEGASWING is con-
nected to a VEGALOG processing system or
a PLC, you have to interrupt the connection
cable to the sensor. By pushing the test key,
the measuring system is checked according
to the following criteria:
- switching function of the switching outputs
- switching function of the fault signal outputs
- potential separation of the outputs
- signal processing of the signal conditioning
instrument.
After pressing the test key, the functionality of
the entire measuring system is checked.
During the test, the following operating condi-
tions are simulated:
- fault signal
- empty signal (only with VEGASWING)
- full signal.
Setup
Test sequence A mode B mode
1 Simulation of a fault signal (after release of the key approx. 3 s) 1)
Level relay deenergised
Fail safe relay deenergised
2 Simulation of an empty signal (approx. 1.5 s) only with VEGASWING
Level relay energised
Fail safe relay energised
3 Simulation of a full signal (approx. 1.5 s)
Level relay deenergised
Fail safe relay energised
4 Return to the current operating status (covered/uncovered)
1) The instrument remains at failure as long as the test key is pushed.
Check if all three switching conditions occur
in the correct sequence and in the stated
duration. If this is not the case, there is a
failure in the measuring system (see "5.2
Failure rectification"). Please note that the
connected instruments are activated during
the function test, which allows you to check
the functionality of all components of the
measuring system.
Due to this fault monitoring, the combination
of the following instruments corresponds to
requirement classes 1 to 3 (AK 3) acc. to DIN
19 251. AK 3 means that the system is fail
safe.
- VEGASWING 61Ex, 63Ex, 81AEx, 83AEx
- SW E60ZEx, SW E82 Z Ex oscillator
- VEGATOR 536 Ex, 537 Ex, 636 Ex signal
conditioning instrument
VEGAVIB is also subjected to the function
test, but it has no approval acc. to WHG and
AK 3 acc. to DIN 19 251.