Data Sheet for Product

Submittal Sheet
Document No. 154-131
October 16, 2018
BT300 VFD NEMA Type 3R
Drive and Bypass
Siemens Industry, Inc.
Description
The NEMA Type 3R Bypasses are companion packages for
the family of BT300 Variable Frequency Drives (VFDs).
Enclosures with this rating provide a degree of protection to
personnel against access to hazardous parts; a degree of
protection to the equipment inside the enclosure to keep out
solid foreign objects (falling dirt), and water (rain, sleet,
snow); and are undamaged by ice forming on the enclosure.
A heater is supplied in the cabinet to protect against
condensation and is rated to 104°F (40°C).
The BT300 Type 3R is designed specifically for HVAC
applications and supports a variety of digital and analog I/O.
It provides built-in features to control pumps and fans.
For information on the family of BT300 VFDs, see the BT300
HVAC Drives Technical Specification Sheet (149-711).
Features
Bypass Power
3-Contactor: Input, Output and Bypass
− Overload protection in bypass mode
− Step-down transformer with primary and
secondary fusing
− Contactors electrically and mechanically
interlocked.
− Drive test function
− Complete electrical isolation of drive
Input Device
− Fused disconnect
− All doors are interlocked and can be
padlocked.
Reactor Options
− Line reactor supplied separately.
− Load reactor (in NEMA Type 3R enclosure)
supplied separately.
Bypass Control
Enable Input
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
− 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
− Drive-Off-Bypass selector
− Bypass pilot light
− Drive Test On-Off selector