Data Sheet for Product
Table Of Contents
Submittal Sheet
Document No. 154-066
February 11, 2008
SED2 NEMA 12 Variable Frequency
Drives with Bypass Options
http://www.sbt.siemens.com/hvp/drives Siemens Industry, Inc.
Description
The Bypass Options are companion
packages for the family of SED2
Variable Frequency Drives.
For information on the family of
SED2 VFDs, see the SED2 Variable
Frequency Drives Submittal Sheet
(154-042).
Bypass Power Features
• 2-Contactor: Output & Bypass
− Overload protection in
bypass mode.
− Step-down transformer
with fused primary and
secondary.
− Contactors electrically and
mechanically interlocked.
• 3-Contactor (optional):
Input, Output, & Bypass
In addition to the 2-contactor features, 3-contactor
features provide:
− Drive test function
− Complete electrical isolation of drive
• Input Device
− Disconnect
− Fused
disconnect
(optional)
− Circuit breaker
(optional)
− All doors are
interlocked and
padlockable
• Reactor Options
− Line reactor mounted in bypass option enclosure.
− Line reactor (in NEMA 1 enclosure) supplied
separately.
− Load reactor mounted in bypass option enclosure.
− Load reactor (in NEMA 1 enclosure) supplied
separately.
Bypass Control Features
• Auto Bypass
− Relay logic allows user to send the motor to bypass
mode based on the drive’s programmable relay.
− The drive’s programmable relay, typically set to
fault, can be set up for applications that run full
speed for an extended period of time.
• Enable Input
− Generally used for safety tie-ins; the motor will not
operate the drive or bypass when open.
• Common Remote Start/Stop
− Common remote start/stop can be used in both
drive and bypass mode.
• Essential Services Mode
− Typically used for smoke purge; the motor goes to
bypass regardless of the selected mode.
− No call to stop will have an effect, including open
safety or stop commands.
− Only turning the power off or opening this contact
will stop the motor.
Bypass – Door Mounted Control Devices
• 2-Contactor Units
− Drive-Off-Bypass selector
− Bypass pilot light
• 3-Contactor Units
− Drive-Off-Bypass selector
− Bypass pilot light
− Drive Test on/off selector