ABB RELION 620 Series Technical Manual page 619

1MAC504801-IB E
620 series ANSI
Technical Manual
This CB mode can be used in soft-started or slip ring motors for protection against a large
starting current, that is, a problem in starting and so on.
GUID-DDAD7B3F-28BE-4573-BE79-FBB488A22ECA V1 EN
GUID-1470A4DB-310F-46BC-B775-843EAB8BA836 V1 EN
Figure 313: 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
Section 6
Supervision functions
613