Mode Of Operation - Siemens SIMOVERT MASTERDRIVES Operating Instructions Manual

Description 09.97
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Mode of operation

Converters with DC current input are suitable for coupling several converters to a common DC link bus. This
permits energy transfer between drives in the motoring and generating modes which in turn means energy
savings.
The DC converter must be connected to the DC bus through an E unit (rectifier unit) due to the pre-charging of
the DC link capacitors. If an I/R unit (rectifier and regenerative feedback unit) is used instead of the E unit, power
is fed back into the supply if the regenerative output for several drives is greater than the motor power required.
The converter is ready for operation after the DC link capacitors have been pre-charged.
The inverter, configured using IGBT modules, generates a three-phase system from the DC link voltage to feed
the motor.
SIMOVERT FC
The inverter open-loop control uses a microprocessor with an adjustable V/f characteristic. The pulse frequency
is preset to 3 kHz when the unit is shipped.
SIMOVERT FC is suitable for single-motor and multi-motor drives with:
♦ Induction motors
♦ Synchronous motors (SM)
♦ Reluctance motors
Some of the applications are, for example:
♦ Pump drives
♦ Fan drives
♦ Textile machines
The following can be set for the V/f characteristic:
♦ Max. frequency 300 Hz
♦ Operation with or without slip compensation
♦ Operation with or without higher-level speed controller
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Siemens AG 6SE7087-6BD70
SIMOVERT MASTER DRIVES Operating Instructions