Installation manual
HB-37420-810-01-25F-EN PSC1-C-100 Installation manual - V2.2.docx Page 90 of 201
Version: 25F
Safety instructions:
• For the safety-related assessment of the output sub-system, on the usage of external
elements in the shutdown circuit, e.g. for increasing the switching rating, the information
from the manufacturer (MTTF
D
, PFH figures, B10d value etc.) is to be used.
• The DC values stated in the table should be used conservatively and compliance with
the boundary conditions (see "Comments" in table) ensured.
• Fault exclusions are allowed according to the applicable standards. The boundary
conditions listed are to be ensured over the long-term.
• When using elements for increasing the switching rating in safety circuits, the function of
these elements must be monitored using suitable readback contacts, etc. (see example
circuits). Suitable readback contacts are contacts that are forced to switch with the
contacts in the shutdown circuit.
• The switching ability of the external switching amplifier must be checked cyclically. The
interval between 2 tests is to be defined to suit the requirement based on the application
and safeguarded by means of suitable measures. Suitable measures can be of an
organisational (switching off and on at the start of the shift etc.) or technical (automatic,
cyclic switching) nature.
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