Figure. 5.3.17 - 98. Example of application: motor starting scheme and using motor status signals.
When a motor is starting, an overcurrent stage with a low pick-up setting is either blocked or –as in
some relays– the setting value is multiplied by a prescribed factor. This prevents the protection stage
from activating and the motor from starting, especially when the low-set overcurrent stage has an
operating time that is shorter than the start-up time of the protected motor. The figure above presents
how the START signals behave during a motor start-up. Also note that the
Mo
Mottor star
or starting
ting signal can be
used to block the overcurrent stage.
Figure. 5.3.17 - 99. Blocking application in the relay configuration.
A
AQ
Q-M255
-M255
Instruction manual
Version: 2.06
© Arcteq Relays Ltd
IM00020
179
Содержание AQ-M255
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