Vega VEGACAL 60 Series, Safety Manual

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1 Functional safety
VEGACAL series 60 • Two-wire 4 … 20 mA/HART
35593-EN-181129
is used, the parameter " SIL " must be activated in the menu level
" Service ".
The parameter adjustment of the interference current influences the
safety-related characteristics. For safety-relevant applications only the
following interference currents are permitted:
•
fail low = <3.6 mA (default value)
•
fail high = 22 mA
The damping of the output signal must be adapted to the process
safety time.
Measured value transmission via HART signal as well as HART
multidrop mode is not permitted.
The effectivity of the set parameters must be checked in a suitable
way.
•
After connecting the instrument, the output signal jumps to the set
interference current (at the end of the switch-on phase)
•
In mode " Simulation ", the signal current can be simulated inde-
pendently of the actual level
To avoid unwanted or unauthorized modification, the set parameters
must be protected against unintentional access:
•
Activate the password protection in the adjustment software
•
Activate the PIN on the display and adjustment module
Access by means of HART handheld or similar equipment is not
permitted.
Protecting against unintentional or unauthorized adjustment can be
done, e.g. by sealing the housing cover.
Caution:
After a reset of the values, all parameters must be checked or read-
justed.
1.4 Setup
Take note of the mounting and installation instructions in the operating
instructions manual.
In the setup procedure, a check of the safety function by means of an
initial filling is recommended.
1.5 Reaction during operation and in case of
failure
The adjustment elements or device parameters must not be modified
during operation.
If modifications have to be made during operation, carefully observe
the safety functions.
Reaction when malfunc-
tions occur
Damping of the output
signal
Inadmissible modes
Inspection possibilities
Access locking
Mounting and installation
Operation and interfer-
ence