HB-37350-810-01-50F-EN PSC1-C-10 Installation manual V2.1.docx Page 70 of 189
Version: 50F
The filter time can be set to between 0 and 64 in steps of 8. The dimension is "msec".
To determine the response time of the overall system, the filter times must be added to
the response times stated for the PSC1 system (see section 11).
Safety instructions:
For a safety-related assessment of the sensor sub-system, the information from the
manufacturer (MTTF
D
, PFH figures etc.) is to be used.
If specific diagnostics are required by the manufacturer to safeguard the safety-related
characteristic values stated, these are to be checked as per the above table "Specific
diagnostic measures for position and speed sensors" in relation to the specific
encoders. If in doubt, clarification by the manufacturer is required.
The DC values stated in the table are to be used conservatively and compliance with
the boundary conditions (see "Comments" in table) ensured.
To determine the DC for safety functions with standstill monitoring, among other
aspects it is necessary to estimate the frequency of the dynamic state. As a general
figure a DC of 90% can be assumed.
Fault exclusions are allowed according to the applicable standards. The boundary
conditions listed are to be ensured over the long-term.
If several sensor systems are necessary for the correct function of an individual safety
function, their partial values are to be combined correctly according to the method
selected. This statement also applies to a combination of digital and analogue sensors
(e.g. safely limited speed with safety door open = door contact + encoder for speed
acquisition)
By means of the suitable selection of the resolution of the sensor system, an
adequately low tolerance in relation to the shutdown thresholds for the individual safety
functions is to be ensured.
On the usage of the encoder input filter, the increase in the response time is to be
taken into account during the assessment of the safety-related function.
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