Skript vom Sommersemester 2012 - Institut für Automatisierungs ...

§ 15 Sicherheitsnachweis (SN)
ZSA
Ausfallarten eines Relais (zu TS3)
Nr. Ausfallart
1 Interruption of any coil
2 Interruption of any contact
3
4
5
6
7
8
Short-circuit or decrease of insulation
resistance:
• across open contacts
• between coil and coil
• between coil and contact
• between coil and case
• between contact and contact
• between contact and case
9 Welding of contacts *
10 Increase of contact resistance
11 Contact chatter
12 Increase of pick-up current
13 Decrease of pick-up current *
*
*
*
*
*
*
Nr Ausfallart
14 Increase of drop-away current
15 Decrease of drop-away current *
16 Change of pick-up to drop-away ratio *
17 Increase of pick-up time
18 Decrease of pick-up time *
19 Increase of drop-away time *
20 Decrease of drop-away time *
21 Relay does not pick up
22 Relay does not drop away *
23 Closure of any front contact at the *
same time as any back contact
(transient or continuous)
24 Non-correspondence between front
contacts
25 Non-correspondence between back
contacts
* Ausfallarten können mit entsprechender Begründung ausgeschlossen werden.
© 2012 IAS, Universität Stuttgart
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