Mode Of Operation - Siemens SIMOVERT FC Operating Instructions Manual

Description 08.96
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Mode of operation

The three-phase AC voltage, fed to the SIMOVERT MASTER DRIVES through the input terminals, is rectified in
a B6 bridge rectifier and fed to the DC link through series resistors. The DC link is charged through two resistors,
so that complete ground-fault proof operation is provided on the load side.
The converter is then ready for operation.
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
SIMOVERT VC
The inverter open-loop control uses a microprocessor and field-oriented vector control with an extremely fast
closed-loop current control. The drive can be precisely adapted to the demanded load torque as a result of the
field-oriented control, which in turn means that the drive has an extremely high dynamic performance.The pulse
frequency is preset to 2.5 kHz when the unit is shipped.
SIMOVERT VC is suitable for:
♦ Induction motors in both single-motor or multi-motor drives.
For multi-motor drives, the motors within the group must be the same.
Some of the applications are, for example:
♦ Winder drives
♦ Rolling mill drives.
When the drive is shipped, closed-loop V/f control is preset. Closed-loop frequency control with field-oriented
vector control must be parameterized.
The converter can be set, as a result of the precise motor simulation up to a maximum frequency of 300 Hz, with
and without stall protection and with and without tachometer feedback.
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Siemens AG 6SE7087-6AH70
SIMOVERT MASTER DRIVES Operating Instructions