Siemens SIMOCODE pro C, System Manual

Page: 326 / 408

Safety and commissioning information for Ex areas
14.2 Dry-running protection for centrifugal pumps by active power monitoring
SIMOCODE pro
326
System Manual, 05/2019, A5E40507475002A/RS-AD/004
14.2.3.9 Safety values
In a system with SIMOCODE pro basic units and current measuring modules, the
functionality of the SIMOCODE pro motor protection and control device is suitable for use in
safety functions up to safety integrity level SIL1.
This applies to the "low demand mode of operation" with a three-year test cycle for safety
functions as well as for the "high demand mode of operation".
● SFF
SIMOCODE
≥ 60 %
● PFH
Max, SIMOCODE
≤ 3 * 10
-6
1/h
● PFD
3a
≤ 3*10
-2
● HFT = 0 (single-channel system)
● T
UL
= 20 years
The failure rate was specified for a maximum ambient temperature of 60 °C.
The requirements demanded of SIL 1 are fulfilled with a reserve of 70% for sensors and
actuators.
14.2.4 Periodic tests
You must regularly test the functional safety of the device for control of ignition sources using
the "Dry-running protection for centrifugal pumps by means of active power monitoring"
function. The procedure corresponds to that for commissioning and is described in section
Test (Page 322).
Note
Calibration of active power measurement
Active power measurement is calibrated just once prior to shipment of the equipment.
It is not necessary to repeat calibration during the equipment's lifetime when used in
hazardous areas for dry-running protection for centrifugal pumps by means of active power
monitoring.
14.2.5 Maintenance and repair
These devices are maintenance-free.
WARNING
Repairs
Repairs to the device may only be carried out by the manufacturer.