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The primary ad justment for the time o f operation o f the unit is made by means o f the
time dial.
HO\'Jever, further adjustment is obtained by moving the permanent magnet
along its supporting shelf; moving the magnet toward the disk and sha ft decreases the
time, while moving it away increases the time.
Pickup Test
Set the relay at the
connections in Figure 11, the main unit should close the contacts within � 4% o f tap
value at rated frequency.
For frequency-compensated relays, pickup must be within 7.5% from
system frequency.
Time Test
Set the relay to the No.
Using the test connection in Figure 11, apply 130% o f tap voltage to the relay.
relay operating times to close its contact are listed in Table V I.
Relay
IFV51AD
&
I FV71AD
BD
H IGH-SE ISM IC TARGET AND SEA L- IN UNIT
The target and seal-in unit has an operating coil tapped at
The relay is shipped from the factory with the tap screw in the higher ampere
position.
The tap screw is the screw holding the right-hand stationary contact.
change the tap setting, first remove one screw from the le ft-hand stationary contact
and place it in the desired tap.
place it on the le ft-hand stationary contact, where the first scre\'J was removed.
See Figure 1.
This procedure is necessary to prevent the right-hand stationary
contact from getting out o f adjustment.
the same time.
1.
Connect relay studs 1 and
ammeter and load box, so that the current can be controlled over a range o f 0.1
to 2.0 amperes.
Turn the time dial to the ZE RO
2.
3.
Increase the current slowly until the seal-in unit picks up.
4.
t1ove the time dial away from the ZE RO time-dial position; the seal-in unit
should remain in the picked-up position.
GEK-49865
0.5
time-dial position and the lowest tap.
5
time-dial setting and the tap as shown in Table V I.
TABLE V I
Tap
Volts Applied
128
166.4
128
113
146.9
166.4
Next, remove the screw from the undesired tap and
Screws should never be le ft in both taps at
2
(see the test circuit o f Figure 12) to a D C source,
(0)
time-dial position.
12
Frequency
Min.
50
60
9.3
50 or 60
0.2
and 2.0 amperes.
See Table V I I.
Using the test
50��
150%
to
o f
The
Max.
9.6
To
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