GEK-49849
TARGET AND SEAL- IN UNIT
The target and seal - i n un i t has an operat i ng coi l tapped at 0 . 2 and 2 . 0 amperes or
0 . 6 and 2 . 0 amperes.
Whe n used wi th tr i p coi l s operat i ng on currents rangi ng from 0 . 2 to 2 . 0 amperes at
the m i n imum control vol tage, the target and sea l - i n tap screw shoul d be set i n the 0 . 2
ampere tap. When the tr i p coi l current r anges from two to 30 amperes at the m i n i mum
contro l vol tage, the t ap screw shoul d be p l aced i n the 2 . 0 ampere tap.
The seal - i n tap screw i s the screw hol d i ng the r i ght-hand stat i on ary contact of
the seal - i n un i t. To change the tap set t i ng, f i rst remove the connect i ng p l ug. Then
tak e a screw from the l eft- h an d stat i on ary contact and p l ace i t i n the des i red tap.
Next, remove the screw from the other tap and p l ace i t back i n the l eft- h an d contact.
Th i s procedure i s neces sary to prevent the r i ght- h an d stat i onary contact from gett i ng
out of adjus tmen t . T ap screws shoul d never be l eft i n both taps at the s ame t i me.
and
Test
1 .
Connect rel ay studs 1 and 1 1 or 1 and 1 2 (see i nternal connect i on s d i agram ) to a DC
source, ammeter and l oad box so that the current can be contro l l ed over a range of
0 . 1 to 2 . 0 amperes.
2 .
C l ose or jumper the contact (s ) that paral l e l the seal - i n un i t contact.
3.
Increase the current s l owly unt i l the seal - i n un i t p i ck s up . See Tab l e 1 2 .
4 .
Open the paral l el contact c i rcui t of step 2 ; the seal - i n un i t shoul d rema i n i n the
p i cked up pos i t i on.
5 .
Decrease the current s l owly unt i l the seal - i n un i t drops out. See Tab l e 1 2 .
TIME OVERCURRENT UNIT
TABL E 1 2
TARGET AND S EAL - IN UNIT OPERATING CURRENTS
TAP
0 . 2
0 . 6
2 . 0
PICKUP
CURRENT
0 . 1 1 5 - 0 . 1 95
0 . 34 5 - 0 . 585
1 . 15 - 1 . 9 5
DRO PO UT
CURRENT
0 . 05 OR MORE
0 . 1 5 OR MORE
0 . 50 OR MORE
Rotat e the t i me d i a l s l owly and check by means of a l amp that the contacts just
c l ose at the zero t i me d i al sett i ng.
Where the contact s jus t c l ose can be adjus ted by run n i ng the stat i on ary contact
brush i n or out by means of i ts adjust i ng screw. Th i s screw shoul d be he l d secur e l y i n
i ts support.
18
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