Brochure

The NEMA Type 3R Bypasses are companion packages for the family of
SED2 Variable Frequency Drives. NEMA Type 3R enclosed bypasses are
manufactured for outdoor locations. The 3R rating provides a degree of
protection to the enclosed SED2 VFD and electrical control components.
A heater is supplied to protect against condensation.
Bypass Control Features
Auto Bypass allows user to send the motor
to bypass mode based on the drive’s program-
mable relay, typically set to fault.
Enable Input is generally used for safety
tie-ins; the motor will not operate in drive
or bypass when open.
Common Remote Start/Stop can be used in
both drive and bypass mode.
Essential Services Mode is typically used for
smoke purge; the motor goes to bypass regard-
less 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 include: Drive-Off-Bypass
selector and bypass pilot light
3-Contactor Units include: Drive-Off-Bypass
selector, Bypass pilot light and Drive Test On/
Off selector.
3R Units available with no bypass
Options
• LON® Interface
• Modbus® Interface
• BACnet® Interface
• Advanced Operator Panel (AOP) Module
VFD with NEMA 3R (A)
Bypass Option or VFD only
Bypass Power Features
2-Contactor: Output and Bypass provides
overload protection in bypass mode with a
step-down transformer with fused primary
and secondary. Contactors are electrically and
mechanically interlocked.
In addition to the 2-Contactor features,
3-Contactor (optional): Output, Bypass
and Input, providing drive test function and
complete electrical isolation of drive.
Input Device includes: disconnect and fused
disconnect (optional). All doors are interlocked
and padlockable.
Reactor Options include: Line reactor mount-
ed in bypass option enclosure; line reactor (in
NEMA 3R enclosure) supplied separately; load
reactor mounted in bypass option enclosure
and load reactor (in NEMA 3R enclosure)
supplied separately.