![background image](http://html1.mh-extra.com/html/eaton/moeller-cmd/moeller-cmd_manual_526370017.webp)
Mean time to dangerous
failure MTTF
d
13
10/12 MN04913001Z-EN
The MTTF
d
value of the undervoltage release depends on the
application. The following values can be estimated for B
10d
:
Table 2:
B
10d
values for undervoltage release
At an assumed operating frequency of 3 operations per day
up to NZM2 and 1.33 operations per day for the NZM3 and
NZM4 the MTTF
d
value is:
Table 3:
MTTF
d
values for undervoltage releases
Undervoltage release
B
10d
value
[Switch operations]
NZM1
10000
NZM2
10000
NZM3
7500
NZM4
5000
Undervoltage
release
B
10d
value
Operations
n
op
MTTF
d
[Switch opera-
tions]
per working
day
[O/year]
[Years]
NZM1
10000
3
750
133
NZM2
10000
3
750
133
NZM3
7500
1.33
333
225
NZM4
5000
1.33
333
150
h
An annual inspection meets the requirements in accor-
dance with section “Average diagnostic coverage DCavg”
(
For further calculation of the safety function see
EN/ISO 13849.
Содержание Moeller CMD
Страница 12: ...8 10 12 MN04913001Z EN...