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Siemens Building Technologies Building Technologies
Variable Frequency DrivesBypass Options
Siemens Building Technologies Building Technologies
Two Contactor Bypass
VFD Bypass Operation
SED2
Drive
Motor
Power Supply
Drive OutputContactor
Bypass Contactor
Mechanically Interlocked
Siemens Building Technologies Building Technologies
Three Contactor Bypass
SED2
Drive
Motor
Power Supply
Drive OutputContactor
Bypass Contactor
Mechanically Interlocked
OptionalInputContactor
VFD Bypass Operation
Optional “3rd” drive input contactor electrically isolates the VFD
Siemens Building Technologies Building Technologies
Bypass Types – Conventional and Electronic
• Conventional bypass – uses hard-wired electrical components for mechanical bypass control– Switches– Fuses– Relays
• Electronic bypass – electronic logic control with simple keypad– Reduced wiring and mechanical
components– Improved system reliability– Additional logic features standard
• Interlocked Start• 2 Safety circuits• Smoke Purge logic
Electronic Bypass
Conventional Bypass
Siemens Building Technologies Building Technologies
SED2 Conventional Bypass
• VFD and Bypass cabinet mounted on common back plate
• Conventional electromechanical control – Indicating lights, selector
switches, relays• All voltages and HP ratings• Configurations available:
– Disconnect (fused on non- fused)
– NEMA 1 cabinet– 2 or 3 contactor control– manual/auto bypass selection
standard– line/load reactor option– Damper end-switch logic option
Siemens Building Technologies Building Technologies
Conventional Bypass Components
Mounting Back Plate
Drive Test Selector
(3 contactor only)
Drive /Off / Bypass
Selector
Bypass ON Indicator
Light
Line Disconnect
Gland Plate
Protectivecover
Conduit Connector
Siemens Building Technologies Building Technologies
Conventional Bypass Components
Line reactor (optional)
Input contactor (optional)
Controltransformer
Power fuses (optional)
Line disconnect
Controlrelays
Field wiring terminals
Motoroverload
relay
Bypass contactor
Output contactor
Siemens Building Technologies Building Technologies
Conventional Bypass Power Range
HP .5 .75 1 2 2 3 5 7.5 10 15 20 25 30 40 50 60 75 100 125
208/240V
480V
575V
A
B
C D E F
A-F denotes VFD frame size
For more info, see the Bypass menu on this CD
Siemens Building Technologies Building Technologies
Electronic Bypass Features
• Easy-touch keypad with status display
• Common remote start/stop• Auto bypass• Essential service mode• Interlock start logic• Disconnect options
– Disconnect– Fused Disconnect– Circuit Breaker
• Two and three contactor models• 6 digital inputs and 6 digital
outputs• Optional line or load reactor
Siemens Building Technologies Building Technologies
Electronic Bypass Components
Controltransformer
Outputcontactor
Motoroverload
relay
Line reactor (optional)
Input contactor (optional)
Power fuses (optional)
Line disconnect
Bypass contactor
Fieldwiring
terminals
Electroniccontrol
board
Siemens Building Technologies Building Technologies
Electronic Bypass Keypad
• Easy-touch electronic keypad displays status and operating configuration
• Indicates current status with 14 LEDs
• Built -in logic reduces wiring and ensures safe operation
Siemens Building Technologies Building Technologies
Electronic Bypass Keypad Features
Indicates that input contactor is closed and drive has power.
Toggling this button opens / closes the input contactor.
Enable closes both drive input and output contactors.
Essential service light flashes when this feature is activated.
Disconnect the motor whether in drive or bypass mode.
Indicates input contactor is closed when on, close pending when flashing.
Enables hand bypass mode.
Enable remote bypass. Bypass light w/ flash. Contactor closes and light comes on when Remote Start input closes.
Auto Bypass light flashes when this feature is activated.
Indicates that one of the safety inputs is open.
Indicates that either the overload input has closed or that the thermal overload has tripped.
Indicates present operational state of interlocked start logic.
Siemens Building Technologies Building Technologies
Electronic Bypass Power Range
A-F denotes VFD frame size
For more info, see the Bypass menu on this CD
HP .5 .75 1 2 2 3 5 7.5 10 15 20 25 30 40 50 60 75 100 125
208/240V
480V
575V
A
B
C D E F
Siemens Building Technologies Building Technologies
• Low harmonics design• Small enclosure size• Many standard
features• Reduces operating
cost• Low power losses/high
efficiency• Minimal effect on
customer power• Wide power range –
from ½ to 125 HP
Siemens SED2 VFD Advantages
For more info, see the Features and Benefits menu on this CD