Operation; Fault Monitoring - Pepperl+Fuchs HiC5861 System Manual

H-System – Isolated Barriers and Termination Boards

Operation

5 Operation
Danger!
Explosion hazard from live wiring of non-intrinsically safe circuits
If you connect or disconnect energized non-intrinsically safe circuits in a potentially explosive
atmosphere, sparks can ignite the surrounding atmosphere.
Only connect or disconnect energized non-intrinsically safe circuits in the absence
of a potentially explosive atmosphere.
Danger!
Explosion hazard from sparking when using operating elements
Using operating elements in a potentially explosive atmosphere can cause sparks that can
ignite the surrounding atmosphere.
Only use operating elements (e. g., switch, slider, button, etc.) in the absence of a potentially
explosive atmosphere.
5.1

Fault Monitoring

Numerous faults can occur between measurement of the process variable and evaluation
in the control system. This can lead to undesirable process statuses under certain
circumstances. These process statuses may result in plant downtime or quality problems
or even present a hazard to persons and the environment. Depending on the device version,
the isolators enable monitoring of the following faults:
• Line faults
Here, the connection cables between the isolator, the field device and the control system
are monitored for lead breakages or short circuits.
• Device faults
The isolators are designed so that internal faults are detected and reported.
In the case of a power failure, the outputs are switched to the de-energized state.
31