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Time Overcurrent Relays
I NDUC T I ON
U N I T
1
2
F i g .
1 7
I nternal Connec t i on s fo r the Type
I AC52B R e l ay Fron t V i ew
LOCATION
The location should be clean and dry free from
d u s t and excessive vibration, and wel
facilitate inspection and testing
MOUNTING
The relay should be mounted on a vertical sur
face . The outline and panel diagrams are shown in
19
20.
Figures
and
CONNECTIONS
Internal c onnection diagrams for the various
&
TAR G ET
S EAL ·I N ELEM ENT
For trip coils operating on currents ranging
from 0.2 up to 2.0 amperes at the minimum control
voltage, set the target and seal -in tap plug in the
0.2 -ampere tap.
For trip coils operating on currents ranging
from 2 to 30 amperes at the minimum control volt
age, place the tap plug in the 2 -ampere tap.
The tap plug is the screw holding the right -hand
stationary c ontact of the seal -in element. To change
the tap setting, first remove the cmmecting plug.
T h en, take a screw from the left -hand stationary
12
Type lAC
I N STAN T ,
UN I T
I N S T A N T .
U N I T
10
"
•
SHORT F I NGER
INSTALLATION
i
lighted to
ADJUSTMENTS
V A R I A B L E R E S i S T A N C E
O R L O A D B O X
S Y N C H R O N O U S
T I M E R
S W I T C H
F i g .
1 8
Tes t i n g Connec t i on s for Ty p e l AC
Re l ay s s uch as Type I AC5 1 A
in
relay types are shown
Typical wiring diagrams are giVen in �ig. _i to�
inclusive .
One of the mounting studs or screws should be
permanently grounded by a conductor not less than
12
B&B
No.
gage copper wire or its equivalent.
INSP ECTION
At the time of installation, the relay should be
inspected for tarnished contacts, loose screws t or
If
other imperfections .
any t r o u b l e is founa it
should be corrected in the manner described un
' 'Maintenance''.
it in
contact and place
the desired tap. Next remove
the screw from the other tap, and place
left-hand contact . This procedure is necessary to
prevent the right -hand s t a t i o n a r y contact from
getting out of adjustment. Screws should not be in
both taps at the same time as pickup for d-e will be
the higher tap value and a -c pickup will be increased.
M AIN ELEM ENT
CURRENT SETTING
The current at which the contacts operate may
be changed by changing the position of the tap plu
in
'
the tap block at the top of the relay . Screw th
� ----
1
1 1 5 V O L T S
R A T E D F R E Q U E N C Y
I
I
I
I
I
--
-.
I
I
I
I
'- - - ...
- - - -
-
I
I
1
i
t- - - - - - t --,
,
I
I
....
L./
\
I
I
1
1 �
y
1--'
I
I
\
I
, _ _.,.,
F R E Q U E N C Y M E T E R
( W H E N R E Q U I R E D )
Fig. 11 to 17 inclusive .
� """' .
it
in the
,
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