Siemens 411 Manuel D’Utilisation

 

MICROMASTER 411 & COMBIMASTER 411    Operating Instructions  

146 

6SE6400-5CA00-0BP0  

When the inverter is operating it gives rise to a non-sinusoidal current from the 
mains supply with harmonics. The amplitude of the harmonics can be reduced by 
fitting input chokes. 

When the mains supply impedance is less then 1% it is necessary to use an input 
choke with the inverter. It is recommended to use the standard MM4 range of input 
chokes, details of which can be obtained from the DA51.2 Catalogue. The choke 
must be housed in a mechanical enclosure appropriate to the environment. 

This is the ratio of the inverter rated power to mains short-circuit power. If the 
mains supply impedance is below 1%, the lifetime of the electrolytic capacitors 
could be reduced. 
The mains short-circuit power may be obtained from the power supply company, or 
may be read from the Type Plate of the supplying power transformer. 

 

Figure 10-18 shows the power loss for the MICROMASTER 411/COMBIMASTER 
411 Inverters.  

88

90

92

94

96

98

0

5

10

15

20

25

30

35

40

45

50

Output Frequency

Effic

ienc

y

Hz

%

Efficiency at Max Line CSB
Efficiency at Min Line CSB
Efficiency at Max Line CSC
Efficiency at Min Line CSC

 

Figure 10-18  Power Losses MICROMASTER 411 / COMBIMASTER 411