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I.L. 41-161J
c. Pass 10 amperes into switch jaw 3 and out
switch jaw 7.
d. With a 0-15 volt, Rectox type voltmeter, measure
and record voltage between switch jaw 3 and the
tap plate.
e. Now measure the voltage across the resistor.
Adjust top filter resistor position until this voltage
is 1.73 times the reading from (d) above. For
relays wired per Figure 2 connect the voltmeter
to switch jaw 3 and to the top filter resistor screw
connection (see Figure 1). For relays wired per
Figure 3 connect voltmeter across switch jaws 2
and 3.
To eliminate zero sequence response (relays wired
per Figure 2 only), remove tap screw, and connect
per Figure 10: Apply I
amperes. Measure voltage from terminal 3 to top
filter resistor screw connection (see Figure 1). Adjust
the neutral filter resistor tap until measured voltage is
zero.
7.3.2. Overcurrent Unit
Turn time dial until stationary contact is deflected
6
= 5 amperes; I
= 10
X
Y
against the backstop. Adjust, if necessary, so that "0"
mark on time dial coincides with index. Then with
time dial at "0" wind up spring until about 5-1/2 con-
volutions show. From this preliminary setting, and
using 3 tap and time dial setting of "11", adjust the
permanent magnet until the relay operates in 8.2
seconds with 15.6 amperes single phase or 3 per
unit through terminals 3 and 7 per Figure 10. This
adjustment is made by means of the damping mag-
net screw.
Next adjust the spring tension until the relay will
close contacts in 90 seconds with 5.2 amperes single
phase (which is tap value or one per unit negative
sequence current) applied through terminals 3 and 7.
This adjustment is made by means of the spiral
spring adjuster. All spring convolutions must be free.
8.
RENEWAL PARTS
Repair work can be done most satisfactorily at the
factory. However, interchangeable parts can be fur-
nished to the customers who are equipped for doing
repair work. When ordering parts, always give the
complete nameplate data.
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