Data Sheet for Product

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

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