Automatic Restart Function - Siemens SINAMICS G150 Operating Instructions Manual

Functions, monitoring, and protective functions
9.2 Drive functions
9.2.5

Automatic restart function

Description
The automatic restart function automatically restarts the cabinet unit after an undervoltage or
a power failure. The alarms present are acknowledged and the drive is restarted
automatically.
The drive can be restarted using:
● The standard procedure starting from standstill, or
● The flying restart function.
For drives with small moments of inertia and load torques facilitating the stopping of the
drive within a matter of seconds (e.g., pump drives operating against a pressure head),
starting from standstill is recommended.
Note
Drives with high moments of inertia
The flying restart function can also be activated for drives with large moments of inertia (such
as fan drives). This enables you to switch to the motor that is still rotating.
Danger to life as a result of unexpected motor movement when automatically restarting
If p1210 is set to values >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, severe injury or material damage.
• Observe the general safety instructions.
• Ensure that the EMERGENCY STOP functions are always fully functional.
492
WARNING
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A