Siemens SED2 VFD Electronic Bypass Option 125-3208 User Manual

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Siemens Building Technologies, Inc. 

P1202 

 

Defines search current used for 
flying start. Value is in % based 
on the rated motor current 
(P0305).   

1. Press   to enter the SED2 

parameter mode and to display 
r0000

.  

2. Press   to advance to 

parameter P1202.  

3. Press   to access the 

parameter values level. 

4. Press   to advance to 

desired value.  

5. Press   to confirm and save 

the setting. 

Minimum = 10 
Default = 100 
Maximum = 
200 

Reducing the search current may improve performance for flying start if the inertia of the system is not very 
high. 

P1203 

 

Sets factor by which the output 
frequency changes during flying 
start to synchronize with the 
turning motor. This value, 
entered in % relative to the 
default time factor, defines the 
initial gradient and influences the 
time taken to search for the 
motor frequency.  

The search time is the time taken 
to search through all frequencies 
between 
f_max + 2 × f_slip to 0 Hz.  

1. Press   to enter the SED2 

parameter mode and to display 
r0000

.  

2. Press   to advance to 

parameter P1203.  

3. Press   to access the 

parameter values level. 

4. Press   to advance to 

desired value.  

5. Press   to confirm and save 

the setting. 

Minimum = 10 
Default = 100 
Maximum = 
200 

1.  P1203 = 100% is defined as giving a rate of 2% of f_slip, nom/ms. 

2.  P1203 = 200% would result in a rate of frequency change of 1% of f_slip, nom/ms. 

3.  A higher value produces a flatter gradient, and thus a longer search time. A lower value has the 

opposite effect.