Inverter Control; Switching The Motor On And Off - Siemens SINAMICS G120 Operating Instructions Manual

6.2

Inverter control

6.2.1

Switching the motor on and off

After switching the supply voltage on, the converter normally goes
into the "ready to start" state. In this state, the converter waits for
the command to switch-on the motor:
• The converter switches on the motor with the ON command.
The converter changes to the "Operation" state.
• The converter brakes the motor after the OFF1 command. The
converter switches off the motor once standstill has been
reached. The converter is again "ready to start".
Converter states and commands for switching the motor on and off
In addition to the OFF1 command, there are other commands that are used to switch off the
motor:
● OFF2 - the converter immediately switches off the motor without first braking it.
● OFF3 - this command means "quick stop". After OFF3, the converter brakes the motor
with the OFF3 ramp-down time. After reaching standstill, the converter switches off the
motor.
The command is frequently used for exceptional operating situations where it is
necessary to brake the motor especially quickly. Collision protection is a typical
application for this function.
● Block operation - The inverter switches the motor off.
● Enable operation - The inverter switches the motor on.
Figure 6-2
Converter with CU230P-2 Control Units
Operating Instructions, 04/2015, FW V4.7 SP3, A5E34257946B AB
Internal sequence control of the converter when the motor is switched on and off
Advanced commissioning
6.2 Inverter control
153