RATINGS
The operating and restraining coils are con
tinuous rated.
The tap setting used on the seal
in unit
is determined by the current drawn by
the contact circuit.
The 0. 2-ampere tap is for use with circuits
that operate on currents ranging from 0.2 up to
2 . 0 amperes at the minimum control voltage.
If
this tap is used with circuits requiring more than
2 amperes there is a possibility that the 7-ohm
resistance will reduce the current to so low a
value that the proper current may not be obtained.
The 2 .0-ampere tap should be used with circuits
that take 2.0 amperes or more at minimum con
trol voltage, provided the current does not exceed
30 amperes at the maximum control voltage.
If
the current exceeds 3 0 a mperes an auxiliary relay
should be used, the connections being such that
the current does not pass through the contacts
or the target and seal-in coil of the protective
relay.
The current-closing rating of the contacts is
30 amperes for voltages not exceeding 250 volts.
The current carrying ratings are affected by the
selection of the tap on the seal-in coil as indicated
in the following table:
Target and Seal-in C oil
Amperes, A-C or D-C
Function
2-Amp Tap
(0. 1 3 ohm)
0. 2-Amp Tap
(7 ohms)
Momentary Duty
30
5
Carry Continuously
0
0
BURDENS
Burdens for the Type
IJS
relays are listed
below. The burden
for
each circuit varies , depending
upon the phase displac ement
of
the two voltages,
from a minimum at 0 degree displacement to a
maximum near 180 degrees displacement.
I
CYCLES
i
CIRC UIT
I
5-6
I
I
5-6
1 1 5
60
7-8
I
I
7-8
I
I
5-6
1 1 5
50
5-6
7-8
I
7-8
Synchronism-Check Relays Type LJS GEH- 1791
CONSTRUCTION
The relay components are mounted in a cradle
assembly which is latched into a drawout case when
the relay is in operation but they can be easily
removed when desired.
To do this, the relay is
first disconnected by removing the connection plug
which completes the electrical connections between
the case blocks and the cradle block. To test the
relay in its case this connection block can be
replaced by a test plug. The cover, which is attached
to the front of the relay case, contains an inter
lock arm which prevents the cover from being
replaced until the connection plugs have been in
serted.
The relay case is suitable for either semi
flush or surface mounting on all panels up tc, 2
inches thick and appropriate hardware is available.
However, panel thickness must be indicated on the
relay order to insure that proper hardware will
be included. For outline and drilling dimensions,
see Fig. 14.
RECEIVING, HANDLING AND
STORAGE
These relays, when not included as part of a
control panel, will be shipped in cartons designed
to protect them against damage. Immediately upon
receipt of a relay, examine it for any damage
sustained in transit.
If
injury or damage resulting
from rough handling is evident, file a damage claim
at once with the transportation company and promptly
notify the nearest General Electric Apparatus Sales
Office.
Reasonable care should be exercised in un
packing the relay.
If
the relays are not to be
installed immediately, they should be stored in their
original cartons in a place that is free from
moisture, dust, and metallic chips. Foreign matter
collected on the outside of the case may find its
way inside when the cover is removed and cause
trouble in the operation of the relay.
ACCEPTANCE TESiZi
Immediately upon receipt of the relay, an
inspection and acceptanc e test should be made to
insure that no damage has been sustained in shipment
and that the relay calibrations have not been dis-
PHASE
VOLTS
WATTS
P . F.
DIFF.
AMPS
oo
3 . 00
1 1 . 6
0.258
1 80°
3.76
1 2 . 0
0.3 13
oo
3 . 3 0
1 0.9
0.300
1 80°
4.07
1 1 .3
0.360
oo
4.35
14.2
0.306
180°
5.25
14.6
0.359
oo
4.75
1 3 . 3
0.357
180°
5.60
13.9
0.403
7
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