GE IFC66A Instructions Manual page 21

H I - SE I SM IC INSTANTANEOUS UN I T
Make sure that the instantaneous unit l ink is in the correct position for the range in which it is to
See the interna l cOnnections diagram Figure 4 and connect as indicated in the test circuit of
operate.
Whenever possib l e use the higher range since the higher range has higher continuous rating.
Figure 1 6.
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Setting The Hi- Seismic Instantaneous Unit
The instantaneous unit has an adjustab l e core l ocated at the top of the unit as shown in Figure 1 .
set the instantaneous unit to a desired pickup l oosen the l ocknut and adjust the core.
cl ockwise decreases the pickup, turning the core countercl ockwise increases the pickup.
s l ow l y until the unit picks up.
is obtained. Once the desired pickup va l ue is reached, tighten the l ocknut.
CAUT I ON:
REFE R TO TABLE 5 FOR THE CONT I NUOUS AND ONE SECOND RAT I NGS OF THE I N STANTANEOUS U N I T.
T HE SE RAT I NGS WHEN APPL Y I N G CURRENT TO T HE I N S TA NTANEOUS UN I T.
The range of the instantaneous unit (see Tab l e 5) must be obtained between a core position of l /8 of a
turn of fu l l c l ockwise and 20 turns counterc l ockwise from the fu l l c l ockwise position.
core in the fu l l c l ockwise position.
1-! I G H D ROPOUT I NSTANTANEOUS UN I T
(
Make sure that the movabl e l ead (see Figure 2 ) i s i n the correct position for the range i n which it is
to operate. Whenever possib l e use the higher range since the higher range has higher continuous rating.
the interna l connections diagram Figure 5 and connect as indicated in the test circuit of Figure 1 6.
The high dropout instantaneous unit has an adjustab l e core l ocated at the top of the unit as shown in
Figure 2 . To set the instantaneous unit to a desired pickup l oosen the l ocknut and adjust the core.
the core c l ockwise decreases the pickup, turning the core countercl ockwise increas�s the pickup.
the current s l ow l y unti l the unit picks up.
pickup va l ue is obtained .
picked up, s l ow l y reduce the current unti l the unit drops out.
greater than the pickup va l ue .
CAUT I ON:
REFER TO TABLE 6 FOR THE CONT I NUOUS AND ONE SECOND RAT I NGS OF THE I N STANTANEOUS UN IT.
C)
THE SE RAT I NGS WHE N APPL Y I NG CURRENT TO THE I N STANTANEOUS UN I T.
The range of the instantaneous unit (See Tab l e 6 ) must be obtained between a core position of l /8 of a
turn of fu l l cl ockwise and 20 turns countercl ockwise from the ful l c l ockwise position.
HI- SE I SM IC TARGET AND SEAL - I N U N I T
The target and seal -in unit has an operating coi l tapped at 0. 2 and 2. 0 amperes.
from the factory with the tap screw in the higher ampere position.
right hand stationary contact.
stationary contact and pl ace it in the desired tap.
� l ace it on the l eft hand stationary contact where the first screw was removed.
Jre is necessary to prevent the right hand stationary contact from getting out of adjustment.
shou l d never be l eft in both taps at the same time.
Hz
Re l ay
50 and 60
IFC6 6
It may be necessary to repeat this operation, until the desired pickup val ue
I nstantaneous Unit
It may be necessary to repeat this operation, until the desired
Once the desired pickup va l ue is reached, tighten the l ocknut.
To change the tap setting, first remove one screw from the l eft hand
GEK-45376
TABLE 1 1
Min.
Max.
1 8 . 0
1 9. 2
Dropout current must be 80 percent or
The tap screw is the screw hol ding the
Next remove the screw from the undesired tap and
1 1
Turning the core
Bring up the current
DO NOT EXCEED
Do not l eave the
Turning
Bring up
With the unit
DO NOT EXCEED
The re l ay is shipped
See Figure l . This proce­
Screws
To
SeL