Siemens SINAMICS S120 Function Manual page 561

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In addition to the component wiring shown above, each drive object that is to carry out a

quick stop if the power fails needs to be parameterized. If parameterization is not carried out,

the drive coasts down once a DC link undervoltage has been identified (OFF2). To

implement the OFF3 function (quick stop), the following parameters need to be set:

● p1240 = 5 (activates VDC_min monitoring)

● p1248 = Active Line Module <= 570 V, Smart Line Module <= 510 V

● p2100.0 = 7403

● p2101.0 = 3 (OFF3) response to the fault entered in p2100.0

Drive functions

Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5

11.9 Application: emergency stop with power failure and/or emergency stop (Servo)

As well as the DC link monitor, which is always active, this activates another variable

alarm threshold, which should be set to a value above the undervoltage shutdown

threshold of 360 V +/–2% in p1248.

(alarm threshold in V). When this threshold is reached, fault 7403 is triggered. This

threshold indicates that the set value has been undershot.

(number of the fault for which a response is to be defined.)

Applications