Operating Instructions

SED2 Conventional Bypass Option Operating Instructions
34 Siemens Building Technologies, Inc.
Additional Parameter Settings
NOTE: If Display Selection for r0000, parameter P0005 = 21 (actual frequency), then the BOP
display alternately shows setpoint values and the actual value (0 Hz).
Flying Start
Parameter Description Action Setting/Default
P1200
Flying Start
Starts SED2 into a spinning
motor by rapidly changing
the output frequency of the
SED2 until the actual motor
speed is found. Then, the
motor runs up to setpoint
using the normal ramp time.
0 = Flying start disabled.
1 = Flying start is always
active, start in direction of
setpoint.
2 = Flying start is active, if
power on, fault, OFF2, start
in direction of setpoint.
3 = Flying start is active if
fault, OFF2, start in
direction of setpoint.
4 = Flying start is always
active, only in direction of
setpoint.
5 = Flying start is active if
power on, fault, OFF2, only
in direction of setpoint.
6 = Flying start is active if
fault, OFF2, only in direction
of setpoint.
1. Press
to enter the SED2
parameter mode and to display
r0000.
2. Press
to advance to parameter
P1200.
3. Press
to access the parameter
values level.
4. Press
to advance to desired
setting.
5. Press
to confirm and save the
setting.
Minimum = 0
Default = 0
Maximum = 6
Suggested = 2
NOTES:
1. Flying start is useful for motors with high inertia loads.
2. Settings 1 through 3 search in both directions. Settings 4 through 6 search only in the direction of the
setpoint.
3. Flying start must be used in cases where the motor may still be turning (such as after a brief input power
break) or can be driven by the load. Otherwise, overcurrent trips occur.
4. If the SED2 faults on F0002 (overvoltage) on a start command, flying start may have to be optimized by
reducing the values in P1203 and P1202.