Brochure

More standard features
Means better control of HVAC applications
The global leader in Heating, Ventilation and Air Conditioning (HVAC)
products and systems, Siemens delivers the SED2 family of Variable
Frequency Drives, designed specifically for HVAC systems and applications.
Using the latest IGBT technology, the SED2 Variable Frequency Drives are
PWM drives loaded with features for HVAC variable torque applications
such as speed control on fans and pumps. Since SED2 drives are preconfig-
ured with the HVAC application parameters, startup and commissioning is
faster, resulting in more cost-effective installations.
• Multi-level program access
• Belt failure detection with or without
an external sensor
• Essential service mode for critical
applications requiring continuous,
uninterruptible operation
• Accepts a wide variety of digital and analog
I/O types, including direct Ni1000 sensor
level inputs
• One common interface throughout all
power ranges
• Advanced Operator Panel (AOP) for upload-
ing/downloading of parameters
• Full form C relay contacts for digital outputs
Standard features that out power
the competition
• Built-in SBT P1 and JCI N2 (Metasys®)
building automation system protocols for
easy network integration
• Optional LON®, Modbus® and BACnet®
(available 2006) interfaces
• Unique low harmonics design minimizing
the need for external filtering
• Built-in PID control for fast accurate
pressure/temperature control
• Pump controller staging/cascading for con-
stant pressure, constant flow applications
Total Harmonic Distortion Reduction
Comparison
In tests between a typical 6 pulse PWM drive
with and without line reactors and DC link
chokes versus the SED2 VFD, the Siemens
Easy Drive demonstrated superior harmonic
performance. In typical HVAC applications,
the SED2 VFD can reduce harmonics by up
to 25% more than other VFDs, even with
line reactors and DC link chokes.
Lower harmonic design eliminates
problems
The generation of harmonic currents on the
AC line created by Variable Frequency Drives
can lead to problems and increased installation
costs. In addition, building design specifica-
tions often require compliance with IEEE 519
standard which limits the amount of harmonic
current and voltage distortion allowed on the
power system. Other products solve the prob-
lem by adding more equipment, more com-
plexity and more cost.