Siemens SINAMICS G120 Operating Instructions Manual page 164

Functions
9.2 Converter control
Table 9- 1
State
Closing lockout
Ready to start
Ready
Operation
Normal stop
Quick stop
162
Explanation of the converter states
Explanation
In this state, the converter does not respond to the ON command. The converter
goes into this state under the following conditions:
The ON command was active when switching on the converter.

Exception: When the automatic start function is active, the ON command must
be active after switching on the power supply.
The OFF2 or OFF3 command is selected.

This state is required to switch on the motor.
The converter waits for the operating enable.
If the converter is controlled via a fieldbus, then you must set the operating enable
in a control word bit.
If the converter is exclusively controlled via its digital inputs, then the operating
enable signal is automatically set in the factory setting.
The motor is switched on.
The motor was switched off with an OFF1 command and brakes with the ramp-
down time of the ramp-function generator.
The motor was switched off with an OFF3 command and brakes with the OFF3
ramp-down time.
SINAMICS G120C frequency converter
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB