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Voltage Relays Type IAV GEH-1814
RECEIVING, HANDLING AND STORAGE
RECEIVING
These relays, when not shipped as a part of a
control panel, will be shipped in cartons designed
to protect them against damage. Immediately upon
receipt of the relay, an examination should be made
for any damage sustained during shipment.
If
in
jury or rough handling is evident, a damage claim
should be filed at once with the transportation
company and the nearest General Electric Sales
Office should be notified promptly.
HANDLING
Reasonable care should be exercised in un
packing the relay in order that none of the parts get
injured or the adjustments disturbed.
STORAGE
If
the relays are not to be installed immediately,
they should be stored in their original carton in a
place that is free from moisture, dust, and metallic
chips.
INSTALLATION
LOCATION
The location should be clean and dry, free from
dust and excessive vibration, and well lighted to
facilitate inspection and testing.
MOUNTING
The relay should be mounted on a vertical sur
face. The outline and panel drilling dimensions are
shown in Fig. 20 for relay Types
lA
V51A, IAV51D,
IAV52A, and IAV53C. Fig. 21 shows outline and
panel drilling for relay Types IAV51K,
lA
V53A,
IAV53B and IAV53D.
CONNECTIONS
Internal connections are shown in Figs. 9 to 15
for the various relays.
GROUND
CONNECTIONS
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 equiva
lent.
ADJUSTMENTS
TARGET AND SEAL-IN UNIT
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 2.0-ampere tap.
The tap plug is the screw holding the right
hand stationary contact of the seal-in element. To
change the tap setting, first remove the connecting
plug. Then, take a screw from the left-hand sta
tionary contact and place it in the desired tap.
Next, remove the screw from the other tap, and
place it in the left-hand contact. This procedure is
necessary to prevent the right-hand stationary con
tact 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.
VOLTAGE
SETTING
The voltage at which the contacts operate may
be changed by changing the position of the tap plug
in the tap block at the top of relay for relays such as
the
lA
V51A,
lA
V52A,
lA
V53A, IAV53B, and
lA
V53D
which have tapped coils. The range of this adjust
ment is from 55 to 140 volts on the 115 volt ratings
and 110 to 280 volts on the 230 volt ratings. The
Type IAV51D is provided with a four-tap resistor
in series with an untapped coil. For relays pro
vided with taps, screw the tap
firmly into the
tap marked for the desired voltage
which the
relay is not to operate}.
The pickup of the relay for any voltage tap is
adjusted by means of a spring adjusting ring. The
ring may be turned by inserting a tool in the notches
around the edge (see Fig. 16}.
By turning the
ring, the operating voltage of the relay may be
brought into agreement with the tap setting em
ployed if, for some reason, this adjustment has
been disturbed. The adjustment also permits any
desired setting between the various taps. The relay
is adjusted at the factory to operate from any time
dial position at a minimum voltage within five per
cent of the tap setting for the relays with tapped
coil mentioned above. For those relays with un
tapped coils, pickup occurs at a voltage which is
8 percent of rated voltage. The relays reset at
80 percent of the operating value on all of the over
voltage relays.
Operating voltage for the over
voltage relays is the minimum voltage for a given
tap setting at which the contacts just make.
9
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