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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.
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)
ECOFAST Motor Starters
GWA 4NEB 950 5221-12 DS 01
Device functions
6-5
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