● The restrictor in the Y1 circuit may not be completely closed during operation.
● The auxiliary pneumatic power is free of oil, water and dirt in line with:
DIN/ISO 8573-1, maximum class 3
● The average temperature viewed over a long period is 40 °C.
● Fault rates are calculated on the basis of a mean time to repair (MTTR) of 8 hours.
● In case of a fault, the pneumatic outlet of the positioner is depressurized. A spring in the
pneumatic actuator must move the valve to the pre-defined, safe end position.
● A dangerous failure of the positioner is when the pressure outlet is not depressurized, or the
safety position is not reached, with a LOW level of maximum 4.5 V at the input for the safety
shutdown.
See also
Settings (Page 238)
10.6 Maintenance/check
Interval
We recommend that the functioning of the positioner is checked at regular intervals of one
year.
Checking the safety function
Check the safety function as detailed in chapter "Settings (Page 238)"
Checking safety
Verify the safety function of the entire safety circuit on a regular basis in accordance with
IEC 61508/61511. The test intervals are determined in the course of calculations for each
safety circuit of a system (PFD
AVG
).
Functional safety
10.6 Maintenance/check
SIPART PS2 with PROFIBUS PA
240 Operating Instructions, 05/2019, A5E00127926-AC
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