Automatic Restart Function (Vector) - Siemens SINAMICS S120 Function Manual

Extended functions

Automatic restart function (vector)

4.6 Automatic restart function (vector)
Description
The automatic restart function automatically restarts the power unit after an under-
voltage or a power failure. The alarms present are acknowledged automatically
and the drive is restarted automatically.
The automatic restart function can also be used to acknowledge any faults and
restart the device.
For brief line supply failures, the motor shaft can still be rotating when restarting. In
order to restart while the motor shaft is still rotating, the "flying restart" function
should be activated using p1200.
Caution
The automatic restart function only operates in vector mode. The Line Modules
(apart from Smart Line Modules 5 kW and 10 kW) are not switched on
automatically when the power is restored.
Warning
!
If p1210 is set to > 1, the motor can be restarted automatically without the need to
issue the ON command.
In the event of prolonged power failures and when the automatic restart function is
activated (p1210 > 1), the drive may have been at a standstill for a long time and
mistakenly considered to have been switched off.
For this reason, entering the area around the drive when it is in this condition can
cause death, serious injury, or considerable material damage.
4-178
© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition