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4. Percentage Slope Characteristic - Points on
the percentage slope curve can be checked by
to
means of the test circuit of Fig. 9. The operating
current required
operate the relay should be
± 7% of the curve values. Care should be taken
not to overheat the relay during these tests.
5. Indicating Contactor Switch (ICS)
Close the main relay contacts and pass sufficient
d-e current through the trip circuit to close the
contacts of the ICS. This value of current should
be not greater than the particular ICS tap setting
being used. The operation indicator target should
drop freely.
6. Indicating
Instantaneous
(Where Used)
The core screw must be adjusted to the value of
the factory. However, interchangeable parts can be
Trip
Unit
(ITT)
furnished
work. When ordering parts, always give the complete
nameplate data.
pick up current desired. It is recommended that
the ITT be set for one hundred amperes. This
setting should be made with the current flowing
into either terminals 7 or 9 and out of terminal 3.
In other words, the external transformer should
be excluded from the test circuit when making
this adjustment.
RENEWA L PA RTS
Repair work can be done most satisfactorily at
to
users who are equipped for doing repair
9
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