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Type /AV Undervolfage and Overvoltage Relays
GEH-12668
(B) For Surface Mounting
Fig. 5.
Voltage Settings
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 the relay. The range of
this adjustment is from 55 to 140 volts on the 115-
volt ratings and 110 to 280 volts on the 230-volt
ratings. 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 the edge (see Fig. 14). By turning the ring,
the operating voltage of the relay may be brought
into agreement with the tap setting employed 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
plug setting. The relay resets at 90 per cent of the
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Outline ancl panel drilling for relay Types IAVSIA, IAVS2A, IAV54A anciiAVSSA
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4-28
thd
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Panel Drilling
Front
minimum operating value on all relays listed except
the IA VS3A which will be explained later.
Operating voltage for the IA VS 1A and the
IA V52A is the minimum voltage for a given tap
setting at which the contacts just make. Operating
voltage for the IA V54A and the IA VSSA is the
minimum voltage for a given tap setting at which
the contacts just break.
On the IA V53A, the operating voltage for a given
tap setting is the minimum voltage at which the left
hand contacts close. The right-hand contacts will
then close at a certain percentage of operating volt
age. If it is desired to change this percentage, the
right-hand moving contact may be rotated on the
shaft after first loosening the clamping screws that
hold it in place. Changing the position of this con
tact gives an adjustment of the voltage to close the
right-hand contacts between SO and 95 per cent of
the voltage which closes the left-hand contacts.
Changing position of the right-hand moving con
tact changes the voltage at which the left-hand con-
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i of relay
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