Replacing A Converter With Enabled Safety Function - Siemens SINAMICS G120C USS/MB Operating Instructions Manual

9.2.2

Replacing a converter with enabled safety function

Electric shock as a result of a residual charge in power components
After the power supply has been switched off, it takes up to 5 min. until the capacitors in the
inverter have discharged so that the remaining voltage is at a non-hazardous level. Death or
serious injury can result when live parts are touched.
● Check that the inverter connections are in a no-voltage condition before you carry out any
NOTICE
Machine damage due to interchanged motor connecting cables
The direction in which the motor rotates switches if you swap the two phases of the motor
line. A motor running backwards may damage the machine or installation. Driven loads with
only one permissible direction of rotation include certain saws.
● Connect the three phases of the motor lines in the right order.
● After replacing the inverter, check the direction in which the motor rotates.
Replacing an inverter with data backup on a memory card
Procedure
To replace the inverter, proceed as follows:
1. Disconnect the line voltage to the inverter and (if installed) the external 24 V supply or the
voltage for the digital outputs of the inverter.
2. Remove the connecting cables of the inverter.
3. Remove the defective inverter.
4. Install the new inverter.
5. Remove the memory card from the old inverter, and insert this into the new inverter.
6. Connect all of the cables to the inverter.
7. Reconnect the line voltage, and (if being used) the external 24 V supply or the voltage for
the digital outputs of the inverter.
SINAMICS G120C converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF
WARNING
installation work.
Corrective maintenance
9.2 Replacing inverter components
373