Operating Instructions

SED2 Conventional Bypass Option Operating Instructions
40 Siemens Building Technologies, Inc.
Pulse Frequency
Parameter Description Action Setting/Default
P1800
Pulse Frequency
Sets pulse frequency (kHz)
of power switches in SED2.
The frequency can be
changed in increments of
2 kHz.
Pulse frequencies > 4 kHz
selected on 380V to 480V
units reduce the maximum
continuous motor current.
1. Press
to enter the SED2
parameter mode and to display
r0000.
2. Press
to advance to parameter
P1800.
3. Press
to access the parameter
values level.
4. Press
to advance to desired
value.
5. Press
to confirm and save the
setting.
Minimum = 4
Default = Varies
by model
(hp/voltage
dependent)
Maximum = 16
NOTES:
1. Minimum pulse frequency depends on P1082 (maximum frequency) and P0310 (rated motor frequency).
2. If silent operation is not absolutely necessary, lower pulse frequencies may be selected to reduce SED2
losses and radio-frequency emissions.
3. Under certain circumstances, the SED2 may reduce the switching frequency to provide protection against
over-temperature..