Siemens SINAMICS S120 Function Manual page 837

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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 ≤ 570 V (for Active Line Modules)

● p2100.0 = 7403

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

Drive functions

Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3

11.6 Quick stop in the event of a power failure 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.

p1248 ≤ 510 V (for Smart Line Modules)

This alarm level (in volts) indicates that the set value has been fallen below. Fault F07403

is triggered when this threshold is reached.

Here you change the response to fault F07403.

Applications