05.00
Description
Siemens AG 6SE7087-6AK85-1AA0
1-1
Rectifier/Regenerating Unit Operating Instructions
1 Description
1.1 Application
The rectifier/regenerating units of the SIMOVERT Master Drives 6SE70 series are power electronics devices for
supplying the DC voltage to the SIMOVERT Master Drives 6SEE70 series of inverters. The
rectifier/regenerating units convert the voltage of a three-phase system into a fixed DC voltage (depending on
the operating mode and voltage tolerance). This voltage is kept constant within a specified range even when the
inverter is feeding power back into the system. The following voltages are specified for the DC voltage output
(DC link voltage):
DC 270V –10% to 310V +15%
at AC system input voltage 200V –10% to 230V +15%
DC 510V –15% to 650V +10%
at AC system input voltage 380V –15% to 480V +10%
DC 675V –15% to 810V +10%
at AC system input voltage 500V –15% to 600V +10%
DC 890V –15% to 930V +10%
at AC system input voltage 660V –15% to 690V +10%
The units with system input voltages of 208 to 230V are identical to the units with system input voltage of 380 to
460V. You only have to set the P071 to the corresponding system input voltage.
You can connect one or more inverters to the output. The total of the rated currents of the installed inverters
may then exceed the rated current of the rectifier/regenerating unit. When planning your system, however,
make sure that the aggregate DC load currents at no time exceed the rated DC current of the
rectifier/regenerating unit
The output current can be increased by connecting power sections of size K in parallel. Up to 2 parallel units of
the same rated current can be connected in parallel with one basic unit (see Section 3.7 for further details on
parallel connection)
You can make technological adaptations and expansions over a defined interface in the control section.
Harmonic loading on the supply network can be reduced by coupling 2 units for "12-pulse mode" (for further
details on "12-pulse mode", see Section 3.8).
1.2
Principle of operation
The power section of the rectifier/regenerating unit consists of two thyristor bridges connected in anti-parallel for
supplying power to the inverter DC link and feeding power back from the DC link into the system. To avoid a
voltage drop in the regenerative mode, you must increase the input voltage for the regenerating bridge by 20% .
You can do this with an (auto) transformer or connecting the bridge to its own power system. If a higher voltage
is not applied to the regenerative terminals, the DC link voltage must be decreased by phase angle control
(permanently (permanent or by external control in regenerative mode only). The link voltage is automatically
controlled by a digital microprocessor-based controller.
A 24 V external supply is required for operating the units (see Sections 3.5 and 9.3).
The rectifier/regenerating unit is suitable for connecting several inverters to a common DC bus. This permits the
exchange of energy between motoring and generating drives, and thus saves energy.
Once the DC link capacitors have been precharged, the inverters are ready for operation.
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