Safety Functions
Safety Functions
|
System conditions |
LZ7H or LZ8H 24 Vdc |
LZ7H or LZ8H 110/230 Vac |
|---|---|---|
|
Database for failure rates |
SN 29500 |
SN 29500 |
|
System type |
Type B |
Type B |
|
Standard used |
IEC 61508 |
IEC 61508 |
|
Beta factor |
1 % |
1 % |
|
Mean time to failure (MTTFd) at an ambient temperature 40 °C (104 °F) |
39.3 |
39.1 |
|
Safe switch-off |
LZ7H or LZ8H 24 Vdc |
LZ7H or LZ8H 110/230 Vac |
|---|---|---|
|
Ambient temperature |
40 °C (104 °F) |
40 °C (104 °F) |
|
Mean time to failure (MTTFd) |
517 years |
289 years |
|
Switch-off time |
80 |
100 |
|
λsd [FIT] safe, detectable |
664 |
638 |
|
λsu [FIT] safe, undetectable |
968 |
935 |
|
λdd [FIT] dangerous, detectable |
218 |
388 |
|
λdu [FIT] dangerous, undetectable |
2.67 |
6.82 |
|
SFF [%] Safe failure fraction |
99 |
99 |
|
DCS [%] Diagnostic coverage safe |
40.7 |
40.6 |
|
DC [%] Diagnostic coverage |
98 |
98 |
|
PFHd probability of a dangerous failure per hour |
LZ7H: 2.40 x 10-9 LZ8H: 2.67 x 10-9 |
LZ7H: 6.27 x 10-9 LZ8H: 6.82 x 10-9 |
|
Safety level |
IEC/CEI 61508-1: SIL 3 ISO 13849-1: Category 3 PL e EN 60954-1: Category 3 |
|
|
ATEX certified as associated device for motor protection in zones 1 and 21 |
LZ7H or LZ8H 24 Vdc |
LZ7H or LZ8H 110/230 Vac |
|---|---|---|
|
Ambient temperature |
40 °C (104 °F) |
40 °C (104 °F) |
|
Mean time to failure (MTTFd) |
447 years |
273 years |
|
Time to trip |
As for class 10 A, IEC/CEI 60947-4-2 |
|
|
λsd [FIT] safe, detectable |
637 |
636 |
|
λsu [FIT]safe, undetectable |
870 |
841 |
|
λdd [FIT] dangerous, detectable |
239 |
402 |
|
λdu [FIT] dangerous, undetectable |
17 |
17 |
|
SFF [%] Safe failure fraction |
99 |
99 |
|
DCS [%] Diagnostic coverage safe |
42.3 |
43.1 |
|
DC [%] Diagnostic coverage |
93 |
95 |
|
Safety level |
IEC/CEI 61508-1: SIL 2 |
|
More safety information is available on request.
| NOTICE |
|---|
|
HAZARD OF SWITCH-OFF FUNCTION PROBLEMS
The ATEX switch-off function must be tested once a year
for phase loss conditions in L1 or L3. Switch off occurs in 1.5 to
2 seconds.
Failure to follow these instructions can result in equipment damage.
|