Siemens 411 Benutzerhandbuch

 

MICROMASTER 411 & COMBIMASTER 411    Operating Instructions  

116 

6SE6400-5CA00-0BP0  

The inverter will always protect itself, the motor and the system from possible 
damage.

Where a short circuit exists on the output of the inverter, the unit will trip 

almost instantaneously to protect itself.

In the event of short and/or long term 

overload conditions, current limit protection now operates rapidly to reduce inverter 
current and prevent a trip occurring.  

This is a very fast current limit, which operates if there is a short circuit (line to line 
or most of line to earth faults) on the output. It is a fixed level trip and operates 
within a few microseconds. 

This is a very fast limit, which operates within a few microseconds and removes 
some of the output pulses to limit the current and protect the inverter. If this pulse 
dropping occurs during overload, the operating condition will usually recover and 
the motor will continue to run without tripping. 

This is a slower limit which allows an overload of at least 60 seconds where the 
current lies above the motor limit but below the Electronic Trip and Overload Limit. 

This is the level set as the maximum continuous motor current. The inverter will 
control the current to this level after other overloads have timed out. 

Figure 10-1 illustrates the interaction of parameters associated with current limit. 
Read Only parameters r0027, r0034, r0037 and r0067 help with fault diagnosis.