Motor Load Jam Protection 51Lr; Identification; Function Block; Functionality - ABB RELION 620 Series Technical Manual

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1MAC504801-IB E

620 series ANSI

Technical Manual

Motor load jam protection 51LR

Function description

Motor load jam protection

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Function block

The Motor load jam protection 51LR is used for protecting the motor in stall or mechanical

jam situations during the running state.

When the motor is started, a separate function is used for the startup protection, and 51LR

is normally blocked during the startup period. When the motor has passed the starting

phase, 51LR monitors the magnitude of phase currents. The function starts when the

measured current exceeds the breakdown torque level, that is, above the set limit. The

operation characteristic is definite time.

The function contains a blocking functionality. It is possible to block the function outputs.

The 51LR does not provide a valid trip time in the fault records by default.

If this functionality is desired, the PICKUP status must be added to the

61850 data set which also causes all 51LR pickup events to be reported.

See the 61850 engineering manual for more information on how to add

items to the 61850 data set.

The function can be enabled and disabled with the Operation setting. The corresponding

parameter values are "Enable" and "Disable".

identification

Protection functions

ANSI/IEEE C37.2

device number

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