50 Operation principle and hardware description
Inverter module (R7i)
The cooling fan at the base of the inverter module is fed from the auxiliary voltage supply.
Inverter module (R8i)
The modules run on wheels, which, along with the quick connector at the AC output,
enable quick replacement of a module for maintenance.
The inverter module is equipped with a speed-controlled cooling fan involving a power
supply board and a fan inverter board that outputs a frequency in the range of 15 to 55 Hz
to the fan. The fan is regulated according to the temperature of the output stage of the
module. The power to the fan is supplied from the intermediate DC circuit.
Description
1 DC (input) connections
2 Output busbars
3 Cooling fan
4 Power connection for cooling fan (X41)
5 Fiber optic connectors
2
3
4
5
1
1
Front view with
cooling fan removed
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