ABB CIRCUIT SHIELD 49/50/51 Manual de instrucciones - Página 2
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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:
I.
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
be
observed.
3. A tripping circuit must be interrupted by
an
"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.
5.
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 .
.A
ATTENTION
~
OBSERVE PRECAUTIONS
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._ .&.
FOR HANDLING
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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.