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UNIT
LOCA"'"ION
TOP
MIDDLE
BOTTOM
UNIT
LOCATION
TOP
MIDDLE
BOTTOM
UNIT
LOCATION
TOP
MIDDLE
BOTTOM
Note that the two angles used in the previous check, i.e. 330 degrees and 270 degrees, are 30 degrees
away from the angle of maximum torque.
shows that the ohmic reach of the unit should be the same at both 330 degrees and 270 degrees and should be
0.866 times the reach at the angle of maximum torque.
ELECTRICAL TESTS - TARGET SEAL-IN
The target seal-in unit either has an operating coil tapped at 0.6 or 2.0 amperes or tapped at 0.2 or
2.0 amperes depending on model ordered.
The relay is shipped from the factory with the tap screw in the lowest tap position.
point of the seal-in unit can be checked by connecting from d-e source {+) to stud 11 of the relay and from
stud 1 through an adjustable resistor and an ammeter back to(-). Connect a jumper from stud 12 to stud 11
also so that the seal-in contact will protect the mho unit contacts.
and increase the d-e current until the seal-in unit operates.
lower.
Do not attempt to interrupt the d-e current by means of the mho contacts.
LOCATION
The location of the relay should be clean and dry, free from dust, excessive heat and vibration, and
should be well lighted to facilitate inspection and testing.
MOUNTING
The relay should be mounted on a vertical surface. The outline and panel drilling dimensions are shown
in Fig. 16.
GEK-45 4 95
TABLE IX (CONTROL SPRING ADJUSTMENT)
PHASE-ANGLE
VA-B
METER
SET FOR
SETTING
300 °
1.5 Volts
300 °
1.5 Volts
300 °
1.5 Volts
TABLE X (OHMIC REACH ADJUSTMENT)
PHASE-ANGLE
0. 5/1 .0/l. 5S1 UNIT
METER
SETTING
l.on TAP
300 °
30 Volts
300 °
3000
30 Volts
TABLE XI
{ANGLE OF MAXIMUM TORQUE ADJUSTMENT)
PHASE-ANGLE METER READING
ANGLE OF
TEST ANGLES
MAX. TORQUE
270 ° and 330°
300 0
300 °
270 0 and 330 °
270 ° and 330 °
300 0
An examination of the mho unit impedance characteristic in Fig. 6
INSTALLATION PROCEDURE
PICKUP AMPS
0.5/l.O/l.5n UNIT
ln TAP
6.0-7.0
6.0-7.0
6.0-7.0
VA-B SET AT
1 /2/3n UNIT
2 n TAP
60 Volts
60 Volts
30 Volts
60 Volts
VA-B SET AT
l/2/3n UNIT
.5/l/l.5n UNIT
ln TAP
30
30
30
Then close the mho unit contact by hand
It should pick up at tap value or slightly
11
l/2/3n UNIT
2n TAP
3.0-3.5
3. 0-3. 5
3.0-3.5
PICKUP
AMPS
14.6-15.4
14.6-15.4
14.6-15.4
PICKUP
AMPS
2n TAP
60
16.5-18.5
60
16.5-18.5
60
16.5-18.!;
The operating
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