Operating Instructions

SED2 VFD NEMA Type 3R/3RHE Bypass Operating Instructions
42 Siemens Building Technologies, Inc.
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 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
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 x f_slip to 0 Hz.
1. Press to enter the SED2
parameter mode and to 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
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.