Siemens ecofast 3RK1702-2GB18-0AA1, Руководство пользователя

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Device functions
ECOFAST Motor Starters
GWA 4NEB 950 5221-12 DS 02
6-5
Deutsc
h
En
glish
6.4 Electronic/mechanical switching technology
Electronic switching technology
The motor starter controls the motor in a 2-phase system with power semi-
conductors.
(Only applicable to soft starters)
Mechanical switching technology
The motor starter controls the motor in a 3-phase system with contactors.
Contact block defective
If a contact block is defective (contactor welded / thyristor failure), the motor
starter cannot shut down the motor.
Note
If necessary, evaluate the message "Switching element defective" and shut
down the branch on the basis of this by means of an upstream contact
block.
Possible causes of faults
The "Switching technology" device function returns the "General fault" signal
in response to the following causes:
• Switching element defective (e.g. contactor contact welded, power semicon-
ductor failed)
• Switching element overload (e.g. semiconductor too hot, only applicable to
soft starters)