Quick Stop In The Event Of A Power Failure Or Emergency Stop (Servo) - Siemens SINAMICS S120 Function Manual

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Quick stop in the event of a power failure or emergency stop (servo)

A drive line-up generally responds when the power fails with an OFF2, even when a Control

Supply Module and a Braking Module is being used. This means that the connected motors

coast down. The Control Supply Module provides the electronics with power via the supply

system or DC link. In this way, controlled movements can be made if a power failure occurs

provided that the DC link voltage is still available. The following section describes how all the

drives carry out a quick stop (OFF3) if the power fails.

Example: interconnection of quick stop due to power failure or emergency off

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)

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 ≤ 570 V (for Active Line Modules)

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.

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

12.4 Quick stop in the event of a power failure or emergency stop (servo)

Applications