Receiving, Handling And Storage - GE IAV51A Instructions Manual

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.
jury or rough handling is evident, a damage claim
should be filed
company and the nearest General Electric Sales
Office should be notified promptly.
The location should be clean and dry, free from
dust and excessive vibration, and well lighted to
facilitate inspection and testing.
The relay should be mounted on a vertical sur­
face. The outline and panel drilling dimensions are
shown in Fig. 20 for relay Types
IAV52A, and IAV53C.
panel drilling for relay Types IAV51K,
IAV53B and IAV53D.
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
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

RECEIVING, HANDLING AND STORAGE

RECEIVING
at once with the transportation
LOCATION
MOUNTING
lA
V51A, IAV51D,
Fig. 21 shows outline and
SETTING
Reasonable care should be exercised in un­
packing the relay in order that none of the parts get
injured or the adjustments disturbed.
If
in­
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
Internal connections are shown in Figs. 9 to 15
for the various relays.
One of the mounting studs or screws should be
permanently
lA
than No. 12 B
V53A,
lent.
ADJUSTMENTS
lA
the V51A,
which have tapped coils.
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.
vided with taps, screw the tap plug firmly into the
tap marked for the desired voltage (below 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
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.
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.
tapped coils, pickup occurs at a voltage which is
8 percent of rated voltage.
80 percent of the operating value on all of the over­
voltage relays.
voltage relays is the minimum voltage for a given
tap setting at which the contacts just make.
Voltage Relays Type IAV
HANDLING
STORAGE
CONNECTIONS
GROUND
CONNECTIONS
grounded by a
&
S gage copper wire or its equiva­
lA lA
V52A, V53A, IAV53B, and
The range of this adjust­
the edge (see Fig. 16}.
The adjustment also permits any
For those relays with un­
Operating voltage for the over­
GEH-1814
conductor not less
lA
V53D
For relays pro­
By turning the
The relays reset at
9