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Siemens Building Technologies Building Technologies Variable Frequency Drives Bypass Options.

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Presentation on theme: "Siemens Building Technologies Building Technologies Variable Frequency Drives Bypass Options."— Presentation transcript:

1 Siemens Building Technologies Building Technologies Variable Frequency Drives Bypass Options

2 Siemens Building Technologies Building Technologies Two Contactor Bypass VFD Bypass Operation SED2 Drive Motor Power Supply Drive Output Contactor Bypass Contactor Mechanically Interlocked

3 Siemens Building Technologies Building Technologies Three Contactor Bypass SED2 Drive Motor Power Supply Drive Output Contactor Bypass Contactor Mechanically Interlocked Optional Input Contactor VFD Bypass Operation Optional 3 rd drive input contactor electrically isolates the VFD

4 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

5 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

6 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 Protective cover Conduit Connector

7 Siemens Building Technologies Building Technologies Conventional Bypass Components Line reactor (optional) Input contactor (optional) Control transformer Power fuses (optional) Line disconnect Control relays Field wiring terminals Motor overload relay Bypass contactor Output contactor

8 Siemens Building Technologies Building Technologies Conventional Bypass Power Range A-F denotes VFD frame size For more info, see the Bypass menu on this CD

9 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

10 Siemens Building Technologies Building Technologies Electronic Bypass Components Control transformer Output contactor Motor overload relay Line reactor (optional) Input contactor (optional) Power fuses (optional) Line disconnect Bypass contactor Field wiring terminals Electronic control board

11 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

12 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.

13 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

14 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


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