Operating Instructions

Start Up Procedures
Siemens Building Technologies, Inc. 35
Flying Start, Continued
Parameter Description Action Setting/Default
P1202
Motor Current: Flying
Start
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
Suggested = 50
(fan load)
NOTE:
Reducing the search current may improve performance for flying start if the inertia of the system
is not very high.
P1203
Search Rate: Flying Start
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
Suggested = 50
(fan load)
NOTES:
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.
4. Always adjust to P1202 and 1203 to equal values when optimizing.