SED2 VFD Electronic Bypass Option Operating Instructions

Electronic Bypass Option Overview

General Description

During normal operation in a typical application, the input and output contactors close and the SED2 operates the motor (Figure 1). The bypass contactor provides the ability to operate the motor on utility power and eliminate the SED2 from the motor control circuit. The SED2 Electronic Bypass Option also allows you to select features that enhance the control of the contactors and the outputs that report operation.

The SED2 Electronic Bypass (E-Bypass) Option consists of a SED2 VFD, and a bypass enclosure with electronic controls (Figure 2). The electronic controls include:

Controller board

Keypad

Step-down power transformer

Contactors:

Bypass

Output

Input (optional)

Overload (current) relay

Reactor (optional)

Disconnect switch (or optional circuit breaker)

BYPASS OVERLOAD

CONTACTOR RELAY

VFD0093R1

 

 

 

 

 

 

VFD

 

 

 

 

 

 

MOTOR

 

 

 

 

 

 

 

 

 

 

 

 

CONTACTOR

CONTACTOR

 

 

INPUT

 

OUTPUT

Figure 1. Functional Block Diagram of

Typical Electronic Bypass Option.

CONTROLLER

SED2 VFD

BOARD

KEYPAD (DOOR

MOUNTED)

 

 

INPUT

 

 

CONTACTOR

 

STEP-DOWN

 

 

POWER

REACTOR

 

TRANSFORMER

 

(OPTIONAL)

 

 

 

OUTPUT

 

 

CONTACTOR

 

 

BYPASS

 

 

CONTACTOR

 

 

 

DISCONNECT

 

 

SWITCH

VFD0094R1

 

(OR OPTIONAL

OVERLOAD

CIRCUIT BREAKER

 

 

SHOWN)

 

(CURRENT)

 

 

 

RELAY

 

Fuses (optional)

Figure 2. Typical SED2 E-Bypass Components.

Cable harnesses

4

Siemens Building Technologies, Inc.

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Siemens 125-3208 operating instructions Electronic Bypass Option Overview, General Description, Fuses optional