Description; Application; Principle Of Operation - Siemens SIMOVERT Master Drives 6SE70 Betriebsanleitung

06.01
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Description

1.1

Application

The SIMOVERT Master Drive power supply units type 6SE70 are power electronic units of compact design.
They function as a DC power supply unit for the SIMOVERT Master Drive inverter series type 6SE70. The
power supply unit generates a DC voltage of fixed amplitude (depending on the mode of operation and the
voltage tolerance) from a three-phase AC power supply system.
One or more inverters and braking DC choppers can be connected to the output of the unit. The sum of the
rated currents of the installed inverters may not exceed the rated current of the power supply unit. On planning
the installation it must be ensured that the sum of the instantaneous load compensation currents at no time
exceeds the rated current of the power supply unit. Feedback of energy to the power supply system is not
possible.
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 power supply unit comprises a six-pulse thyristor bridge for controlled rectification of
the three-phase AC power supply. Control of the link circuit voltage is effected by means of a digital controller
module with microprocessor.
A 24V external supply is required for operating the units (see Sections 3.5 and 9.3).
The common rectifier 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.
Start-up of the rectifier unit is carried out via an operator panel on the electronics box. Operation is performed
via the terminal strip or via a serial interface
Optional interfaces and intelligent I/O modules are available in conjunction with programmable controllers and
other automation equipment for controlling the common rectifiers.
Siemens AG 6SE7087-6AK85-0AA0
Common Rectifier Operating Instructions
ENGLISH
Description
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