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06.2005
2
Description
DC link voltage
operating range
Siemens AG
6SE7087-6CX86-2BA1
SIMOVERT MASTERDRIVES AFE
The AFE (Active Front End) rectifier/regenerative feedback units
belonging to the SIMOVERT MASTERDRIVES AFE series are power
electronics devices that are available as cabinet units, as chassis units
and as compact units.
The mounting variant (modular mains connection) described in the
following section for construction types E to J is available only in the
400 V line voltage range.
The units can be operated on a 3-phase mains with or without an
earthed neutral point.
♦ 400 V mains voltage range:
3AC 380 V (− 20 %) to 460 V (+ 5 %)
The core component of the AFE rectifier/regenerative feedback unit
consists of a voltage source converter with the CUSA control unit and it
generates a controlled DC voltage, the so-called DC link voltage, from a
3-phase mains.
This DC link voltage is kept constant almost independently of the mains
voltage (also in the event of regenerative feedback). The prerequisite
for this is that the DC voltage setpoint is within the operating range
defined below.
Minimum:
1.53 times the rms value of the connected mains voltage.
Explanation: the DC link voltage of the AFE inverter must
at least be greater than the peak rectified value of the
applied mains voltage to ensure that the power system is
no longer controlled via the freewheeling diodes of the
IGBT switches.
Maximum:
for the 400 V mains voltage range:
Operating Instructions
Description
740 V
DC
2-1
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