ABB RELION 611 Series Technical Manual page 298

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Protection functions

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Functionality of start-up supervision in the "IIt, CB" mode and the "IIt

and stall, CB" mode

The Str over delay time setting has different purposes in different modes of operation.

In the "IIt" or "IIt & stall" modes, the aim of this setting is to check for the

completion of the motor start-up period. The purpose of this time delay setting is

to allow for short interruptions in the current without changing the state of the

MOT_START output. In this mode of operation, the value of the setting is in the

range of around 100 milliseconds.

In the "IIt, CB" or "IIt & stall, CB" modes, the purpose of this setting is to check

for the life of the protection scheme after the CB_CLOSED input has been

activated. Based on the values of the phase currents, the completion of the start-

up period cannot be judged. So in this mode of operation, the value of the time

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Technical Manual