Automatic Restart - Siemens Sinamics S110 Function Manual

7.2.3

Automatic restart

Description
The "automatic restart" function is used to restart the drive automatically once the power has
been restored following a power failure. In this case, all of the faults present are
automatically acknowledged and the drive is powered-up again. This function is not only
restricted to line supply faults; it can also be used to automatically acknowledge faults and to
restart the motor after any fault trips.
If p1210 is set to value > 1, the motor can start automatically once the power supply has
been restored. This is especially critical if the motor comes to a standstill (zero speed) after
longer line supply failures and it is incorrectly assumed that it has been powered down. For
this reason, death, serious injury, or considerable material damage can occur if personnel
enter the working area of a motor in this condition.
Automatic restart mode
Table 7- 19
0
1
Drive functions
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
WARNING
Automatic restart mode
p1210 Mode
Disables automatic restart
Acknowledges all faults without
restarting
Meaning
Automatic restart inactive
When p1210 = 1, faults that are present are
acknowledged automatically when their cause is
rectified. If further faults occur after faults have been
acknowledged, then these are also again
automatically acknowledged. A minimum time of
p1212 + 1 s must expire between successful fault
acknowledgment and a fault re-occurring if the
signal ON/OFF1 (control word 1, bit 0) is at a HIGH
signal level. If the ON/OFF1 signal is at a LOW
signal level, the time between a successful fault
acknowledgment and a new fault must be at least
1s.
For p1210 = 1, fault F07320 is not generated if the
acknowledge attempt failed (e.g. because the faults
occurred too frequently).
Drive functions
7.2 Basic functions
177