2
INDUCTION
UN
IT
INSTANT,
UN IT
INSTANT,
UNIT
9
10
•
*SHORT FINGER
Fig. 15 (X-6209663 [8])
Internal Connections for
the Type IAC52B Relay (Front View)
Time Overcurrent Relays Type
lAC
GEH-1753
TO TIM[!?
'STOP"
--
TO INDICATING LIGHT
WHEN
CHECKING PICKUP
OF MAIN UNIT
---
r---
_..
TO INDICATING LIGHT WHEt
CHECK lNG PICKUP OF
INSTANTANEOUS
UN
IT
6
0
3
4
5
0
0
0
0
6
7
8
9
10
X
LA13 TEST PLUG
VARIABLE RESISTOR
TO TIMER
'START"
MIN. RECCM.IENDED VOLTS,
120
AT RATED FREQUENCY
TO ACCURA
T£
L Y
REPROWCE
RELAY CHARACTERISTICS
ALL TESTS SHOULD
BE
..-,OE WITH RELAY
IN CASE.
Fig. 16 (K-6154399-7) Testing Connections for
Type lAC Relays such as Type IAC51A
INSTALLATION
LOC
A
T
I
O
N
The location should
be
clean and dry, free from
dust and excessive vibration, and well lighted to
facilitate inspection and testing.
MOUNTINQ
The relay should
be
mounted on a vertical
surface. The outline and panel diagrams are shown
in Figs. 20 and 21.
CONNECTIONS
Internal connection diagrams for the various
relay types are shown in Fig. 11 to 17 inclusive.
Typical wiring diagrams are given in Fig.
4
to
6
inclusive.
One of the mounting studs or screws should
be
permanently grounded by a conductor not less than
No. 12
B&S
gage copper wire or its equivalent.
INSPICTION
At the time of installation, the relay should be
inspected for tarnished contacts, loose screws, or
other imperfections.
If
any trouble is found, it
should be corrected in the manner described under
MAINTENANCE.
CAUTION:
Every circuit
in
the drawout case has an auxi
liary brush. It is especially important on current
circuits and other circuits with shorting bars that
the auxiliary brush be bent high enough to engage
the connecting plug or test plug before the main
brushes do. This will prevent CT secondary cir
cuits from being opened.
CONNECTING PLUG
MAIN BRUSH
CONNECTING BLOCK
NOTE: AFTER ENGAGING AUXILIARY
BRUSH,
CONNECTING
PLUG
TRAVELS
1/4
INCH BEFORE ENGAGING
THE MAIN BRUSH
ON
�HE TERMINAL BLOCK.
Fig. 17 (8025039) Cross Section of Drawout Case
Showing Position of Auxiliary Brush.
11
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