Pickup Test; Time Test; Instantaneous Unit; Setting The Instantaneous Unit - GE IAC Series Instruction Booklet

moving the magnet
moving it away increases the time.
Set the relay
Using the test connections
its contacts within
pos itions s hould pick up at tap value ±5% of tap value.

Time Test

*
Set the relay at the
Using the test
( 10. 0 amp) to the relay.
±0. 0 7 second. At 2 times tap current and 10 times tap cu r r ent,
operating time should agree with the time-cu r ve value ± 7 % .

INSTANTANEOUS UNIT

Make sure that the ins tantaneous unit is wir ed fo r
which it is to oper ate (see Internal -Connections-Diag ram Figur es 5 o r
7 ) and connected
possible, use the higher range,
continuous rating.
Loosen the
setting. See Figu re
pickup; turning
the cu rrent sl owly until the unit picks up.
r epeat this operation
Once the desired pickup value is reached, tighten the l ocknut.
The instantaneous unit
l eave the test current on too long,
With the unit
connections) and the target in the
at the maximum
limits in Table XI.
* I ndicates revision
GEK-34054
toward the disk
at the 0. 5
Figure 14,
of
±2% o f tap
No. 5 time-dial
connectio ns of Figure
The
as indicated in
locknut and turn
2. Turning
the pole piece down decreases
until the
CAUTION
is r ated
con nected
calibration mark;
s haft decr eases
time-dial position
the main unit s hould cl ose
value cu r r ent.
position and
14, apply
relay shoul d oper ate in
Test-Circuit
since the higher
the pole piece
the pol e piece
It may be necessa r y to
desired pickup
1. 5 times m�n�mum
may
as it damage the unit.
f o r high-range
"Down" position,
the pickup s hould
13
the time,
and 2. 0 amp
All
other
2. 0 amp tap.
5 times tap cu r rent
1. 3 1 seconds
the r ange in
14.
Figu r e Whenever
r ange has a highe r
towa r d the des i r ed
up incr eases
the pickup. B r ing up
value is obtained.
Do
pickup.
ope r ation (pa r al l el
check the pickup
be within
while
tap.
tap
the
the
not
the