Operating instructions

Functional safety
8.2 Device-specific safety instructions
SIPART PS2 with and without HART communications
110 Operating Instructions, A5E00074631-09
Checking the safety function
To check that the safety configuration is correct, apply a set current of 3.6 mA.
In this condition, the valve actuator must bring the valve to the intended safety position.
8.2.4 Behavior in case of faults
Repairs
Defective devices should be sent in to the repair department with details of the fault and the
cause. When ordering replacement devices, please specify the serial number of the original
device. The serial number can be found on the rating plate.
The address of the responsible SIEMENS repair center, contacts, spare parts lists, etc. can
be found on the Internet.
See also
Services & Support (http://www.siemens.com/automation/services&support)
Partner (http://www.automation.siemens.com/partner
)
8.2.5 Safety characteristics
The safety characteristics necessary for use of the system are listed in the SIL declaration of
conformity. These values apply under the following conditions:
● The positioner is only used in applications with a low demand rate for the safety function
(low demand mode).
● Communication with the HART protocol is only used for
– Device configuration
– Reading diagnostic values
– However, it is not used for operations critical to safety. In particular, the trace function
must not be activated in safety related operation.
● The safety-related parameters/settings (see "Settings" section) have been entered by
local operation or HART communication and checked on the local display before
commencing safety-instrumented operation.
● The positioner is blocked against unwanted and unauthorized changes/operation.
● The 4 to 20 mA input signal for the SIPART PS2 positioner is generated by a safe system
that fulfills a minimum of SIL 2.
● The connected valve actuator must be single acting and switch the valve to its safe end
position by spring force in the following cases:
– Pressure failure
– At a chamber pressure (Y1 connection) up to a third of the maximum available inlet
pressure (Pz connection)
Chapter 8 is invalid and is replaced by
Compact operating instructions
"Functional Safety SIPART PS2" A5E00442120-04