Safety Figures; Safety Functions; Sil Declaration Of Conformity - Eaton zeb XTOE Handbuch

2.5 Safety Figures

2.5.1 Safety functions

2.5.2 SIL Declaration of Conformity

The overload relay ZEB is designed to open a contactor by tripping a latching
solenoid in response to detection of the following conditions:
• Overload Current (includes Jam condition)
• Phase Loss
• Phase imbalance
• Ground fault
• Calculated Thermal Overload
Values in the safety and commissioning instructions for 70 °C ambient
temperature. Safety data for software revision no. 1.01.023.
Safety Integrity Level
Safety Integrity Assessment
Hardware Fault Tolerance
Failure rate for detected safe failures
Failure rate for undetected safe failures
Failure rate for detected dangerous failures
Failure rate for undetected dangerous failures
Safe Failure Fraction
Diagnostic Coverage
Mean Time Before Failure
Average probability of failure on demand
Architecture
T1 Value
Lifetime
Proof Test Interval
Systematic capacibility
Failure Mode Definitions
1) Safe Detected: The overload relay software detects and change the contactor state for the random
hardware failures not impacting safety function performance.
2) Safe Undetected: The overload relay software may not detect the random hardware failures which do not
impact the safety function performance.
3) Dangerous Detected: The overload relay software detects and changes the contactor state for the random
hardware failure impacting safety function performance.
4) Dangerous Undetected: The overload relay software may not detect the random hardware failures which
may impact safety function performance.
ZEB (XTOE, C440) 11/16 MN03402007Z-DE/EN www.eaton.com
Symbol Value
SIL 1
Hardware Safety Integrity
Compliance as per route 1H
Software Safety Integrity
Compliance as per route 2s.
HFT 0
1) -9
l 137 x 10 1/h
SD
2) -9
l 2080 x 10 1/h
SU
3) -9
l
134 x 10 1/h
DD
4) -9
l
876 x 10 1/h
DU
SFF 73 %
DC 13.25 %
MTBF 309 885 h
-3
PFD 3.85 x 10
AVG
1001
DIN EN 60079-17, Section 4.4
20 years
1 year
SC 2
2 Engineering
2.5 Safety Figures
37