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TARGET AND SEAL- IN UNIT
The t arget an d seal - i n un i t has an operat i ng c o i l t apped at 0 . 2 and 2 . 0 amperes or
0 . 6 and 2 . 0 amperes.
Whe n us e d 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 i mum control vol tage, the target and sea l - i n tap screw shoul d be set i n the 0 . 2
ampere t ap.
When the tr i p co i l current r anges from two to 30 amperes at the m i n i mum
contro l v o l tage, the t ap screw shoul d be p l aced i n the 2 . 0 ampere t ap.
The seal - i n tap screw i s the s crew h o l d i n g the r i ght-hand s t at 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
t ak e a sc rew from the l eft- h an d stat i on ary con tact 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 con tact.
Th i s procedure i s neces s ary to prevent the r i gh t- h an d stat i onary contact from gett i ng
out of adjus tmen t .
1 .
Con nect rel ay s tuds 1 and 1 1 or 1 and 1 2 (see i n ter n a l connect i on s d i agr am ) to a DC
source, ammeter and l oad b ox so that the c urrent c an be contro l l ed over a range of
0 . 1 to 2 . 0 amperes.
C l ose or jumper the contact (s ) t h at paral l e l the seal - i n un i t contact.
2 .
3.
Increase the current s l owly unt i l the seal - i n un i t p i ck s up .
4 .
Open the paral l e l contact c i rcui t of st ep 2 ; the seal - i n un i t shoul d rema i n i n the
p i ck e d up pos i t i on.
5 .
Decrease the c urrent s l owly unt i l the seal - i n un i t drop s out. See Tab l e 1 2 .
TIME O VERC URRENT UNIT
Rotat e the t i me d i a l s l owl y and c heck by mean s of a l amp that the contacts just
c l ose at the zero t i me d i a l sett i ng.
Where the contact s jus t c l ose can be adjus ted by run n i n g the stat i on ary contact
brush i n or out by mean s of i ts adjust i ng screw. Th i s screw s h oul d be he l d secur e l y i n
i t s s upport.
GEK-49849
T ap screws shoul d n ever be l eft i n both taps at the s ame t i me.
TARGET AND S EAL - IN UNIT OPERATING CURRENTS
P ICKUP
C URRENT
TAP
0 . 1 1 5 - 0 . 1 95
0 . 2
0 . 6
0 . 34 5 - 0 . 58 5
2 . 0
1 . 1 5
TABL E 1 2
D RO PO UT
CURRENT
0 . 05 O R MORE
0 . 1 5 OR MORE
- 1 . 9 5
0 . 50 OR MORE
18
See Tab l e 1 2 .
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