ABB CIRCUIT SHIELD 49/50/51 사용 설명서 - 페이지 2

{카테고리_이름} ABB CIRCUIT SHIELD 49/50/51에 대한 사용 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. ABB CIRCUIT SHIELD 49/50/51 14 페이지. Overcurrent relay for motor protection

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Motor Overcurrent Relay

TABLE OF CONTENTS

Introduction

.........................

Page 2

Precautions ............... ............ Page 2

Placing Relay into Service

....

Page 3

Application Data .................. Page 4

Specifications ....................... Page 6

Testing ................................. Page 11

Obsolete Units ...................... Page 14

INTRODUCTION

These instructions contain the information required to properly install, operate, and test the ABB Circuit-Shield™ Type

49/50/51, Type 49/50, and Type 49 Motor Overcurrent Relays.

The relay is housed in a case suitable for conventional semiflush panel mounting. All connections to the relay are made at the

rear of the case and are clearly numbered. The 414 series relay provides totally drawout construction with integral test

facilities. Current transformer shorting is accomplished by a direct-acting spring and blade assembly upon removal of the

relay from its case. Sequenced disconnects prevent nuisance tripping during withdrawal or insertion of the relay if the

normally-open contact is used in the application. The 214 series relay is of partial drawout construction with the input

transformers remaining in the case upon withdrawal of the lower circuit

board.

All settings are made on the front panel of the relay behind a removable clear plastic cover. The targets are reset by means

of a push-button extending through the relay cover.

PRECAUTIONS

The following precautions should be taken when applying these relays:

Incorrect wiring may result in damage. Be sure wiring agrees with the connection diagram for the particular relay before

energizing.

2. Apply only the rated voltage marked on the relay front panel. For units rated for de control

power,

the proper polarity must

observed.

3. A tripping circuit must be interrupted by

"a" contact to remove high current from the output circuit. Do not exceed contact

ratings.

4. When applying high input currents during testing, interrupt the current immediately after the relay operates to prevent thermal

stress.

High voltage insulation tests are not recommended. See section on testing for additional information.

6. The entire circuit assembly of the relay is removable. The unit should insert smoothly. Do not use excessive force.

7. Follow test instructions to verify that the relay is in proper working order.

8. When handling this relay, take all the necessary precautions to prevent damage from static

electricity.

This relay contains

static sensitive components which could be damaged without proper grounding .

ATTENTION

OBSERVE PRECAUTIONS

._ .&.

FOR HANDLING

.&f.a...'

ELECTROSTATIC

SENSITIVE DEVICES

CAUTION: since troubleshooting

entails

working with

energized equipment, care

should be taken to avoid personal shock.

Only competent technicians familiar with good safety practices should service these

devices.