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
•Controller board
•Keypad
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•Contactors:
−Bypass
−Output
−Input (optional)
•Overload (current) relay
•Reactor (optional)
•Disconnect switch (or optional circuit breaker)
BYPASS OVERLOAD
CONTACTOR RELAY
VFD0093R1 |
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| VFD |
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| MOTOR |
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CONTACTOR | CONTACTOR | |||||||||||||
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| INPUT |
| OUTPUT |
Figure 1. Functional Block Diagram of
Typical Electronic Bypass Option.
CONTROLLER | SED2 VFD |
BOARD |
KEYPAD (DOOR
MOUNTED)
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| INPUT | |
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| CONTACTOR | |
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| POWER | REACTOR | |
| TRANSFORMER | ||
| (OPTIONAL) | ||
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| OUTPUT |
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| CONTACTOR |
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| BYPASS |
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| CONTACTOR |
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| DISCONNECT | |
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| SWITCH | |
VFD0094R1 |
| (OR OPTIONAL | |
OVERLOAD | CIRCUIT BREAKER | ||
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| SHOWN) | ||
| (CURRENT) | ||
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| RELAY |
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• Fuses (optional) | Figure 2. Typical SED2 |
•Cable harnesses
4 | Siemens Building Technologies, Inc. |