Setting Notes - Siemens SIPROTEC 7SK80 Manual

Motor protection

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Logic diagram of the load jam protection

2.7.3.2 Setting Notes

A warning and a tripping element can be configured. The threshold value of the tripping element 4402 Load

Jam I> is usually configured below motor startup at double motor ampere rating. Warning element 4404 I

Alarm is naturally set below the tripping element, to approx. 75% of the tripping element, with a longer delay

time (parameter 4405 ALARM DELAY). If the warning element is not required, the pickup value can be set to

its maximum value and the respective message from the buffers can be removed.

SIPROTEC, 7SK80, Manual

E50417-G1140-C344-A4, Release date 08.2010

2.7 Motor Protection (Motor Starting Protection 48, Motor Restart Inhibit 66, Load Jam Protection)