Siemens SED2 VFD Electronic Bypass Option 125-3208 - Manual (Page 45)

Startup Procedures
Siemens Building Technologies, Inc. 37
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. At 4 kHz, full output current is obtained up to 50 degrees C (CT mode); over 50 degrees C, full output
may be obtained at 8 kHz.
3. If silent operation is not absolutely necessary, lower pulse frequencies may be selected to reduce SED2
losses and radio-frequency emissions.
4. Under certain circumstances, the SED2 may reduce the switching frequency to provide protection
against over-temperature.