RVF 327, 327 S, 330, 330 S
ex no. 1200
Machine description
page 26 of 144
Version 1.5
2.6
SAFETY-RELATED USER INFORMATION
According to 6.3 of the EN ISO 13849-1:2008, based on the risk assessment, safety-related
functions are classified in protection level PL c. Two timing chains which are independent of
each other are safety relevant.
Timing chains of the respective switch (magnet switch, funnel, hopper flap) at the same time
effective on the main drive contactor and grinder drive via the control unit at the same time.
According to Point 11 of the EN ISO 13849-1:2008, user information is provided as follows:
Elements included in the safety-related control loop are in keeping with the following
requirements. Only original components may be used for replacement of the safety
components listed. At a minimum, they must meet the conditions specified.
For all safety relevant switches (magnet switch, funnel, hopper flap), a safety evalua-
tion unit of SIL category 3 (PL e) is built in. This has direct effect on the excitation
winding on the clough of the main drive.
Main drive
1.
Magnet switch funnel as turnkey, hopper flap as turnkey
PFH at least 3 x 10
-7
to 10
-6
cycles per hour
Switch connected as opener
Protection level PL d
2.
Analysis unit
PFH at least 10
-7
cycles per hour
Exit connected as opener
Protection level PL e
Likelihood of breakdown
≥
10
-8
bis < 10
-7
3.
Electric contactor main drive
PFH at least 10
-6
switching cycles per hour
Wiring outlet as an N/C contact
Protection level PL c
If one of the elements fails, the entire chain will go into safe mode.
