Siemens 400 V / 210...590 A operating instructions Description 01.2004

Description 01.2004

Operating principle On the 3-phase end, a mains angle-oriented high-speed vector control is subordinate to the DC link voltage control and impresses an almost sinusoidal current on the network so as to minimize system perturbations with the aid of the subsequently connected Clean Power filter.

The vector control also enables setting of the power factor cos phi, and thus reactive power compensation, but the operating current requirement has priority.

The VSB module (Voltage Sensing Board), functions as the network angle sensor, similarly to the principle of an encoder.

For safety reasons, an AFE rectifier/regenerative feedback unit must be connected to the mains via a main contactor; see Fig. 2-1. For this reason, an external 24 V power supply is always required to feed the VSB board and the AFE inverter.

			6
					VSB			CUSA
	Precharging contactor
	RV
Line supply
connection
									C / L+
L1, L2, L3						U2			DC units
						V2
									connection
						W2
Main contactor
									D / L -
PE				CF
Precharging and main contactor			CleanPower filter AFE reactor				AFE inverter with CUSA
								and fuses
		Fig. 2-1	Basic circuit

2-2	6SE7087-6CX86-2BA1 Siemens AG
	Operating Instructions SIMOVERT MASTERDRIVES AFE