Eaton CMD(24VDC), Руководство пользователя

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2 Engineering
2.5 Mean time to dangerous failure MTTFD
28
CMD(24VDC), CMDTD 08/23 MN121001ZU-DE/EN Eaton.com
Table 1: B
10D
values for contactors
The MTTF
D
time of the contactor is calculated according to formula 2 with
the mean annual number of switch operations depending on the application.
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 the MTTF
D
value is:
Table 3: MTTF
D
values for undervoltage releases
Contactor B
10D
value
Utilization category AC-3
Switch operations
DILM7 1,782,229
DILM9 1,782,229
DILM12 1,782,229
DILM17 966,617
DILM25 966,617
DILM32 966,617
DILM40 1,341,161
DILM50 1,341,161
DILM65 1,341,161
DILM80 1.058.707
DILM95 1.058.707
DILM115 1,705,268
DILM150 1,705,268
DILM185A 1.774.629
DILM225A 1.774.629
Undervoltage release B
10D
value
Switch operations
NZM1 20000
NZM2 10000
NZM3 2500
Undervoltage
release B
10D
value operations n
op
MTTF
D
switch
operations per working
day operations/
year years
NZM1 20000 3 750 266
NZM2 10000 3 750 133
NZM3 2500 1.33 333 75