I.L. 41-681.1R
6
3. Disc Unit
a. Contacts (Mechanical) - The index
mark on the movement frame will coin-
cide with the “0” mark on the time-dial
when the stationary contact has
moved through approximately one-half
of its normal deflection. Therefore, with
the stationary contact resting against
the backstop, the index mark is offset
to the right of the “0” mark by approxi-
mately 0.020 inches. The placement of
the various time-dial positions in line
with the index mark will give operating
times as shown on the time curve.
b. Operating Circle - Set up the CVE
relay per the test diagram in figures 13
and 14. When V2= V1= rated voltage
and their phase difference is between
18 and 22 degrees, (either leading or
lagging), the contacts should just
close. Another condition for the con-
tacts to just close is when V1= rated
voltage and V2is increased from a low
value to 94 ±4 volts in phase with V1.
c. Time Curve - With the time-dial set at
position 11, the contacts should close
in 20 ac ±1 second when V1and V2,
equal to the rated voltage at zero
phase angle, are applied.
4. Telephone Relays
Apply an ac voltage to each telephone
relay circuit. The telephone relay must
pickup when 95 volts are applied.
D. CVE-2 (Figure 15)
1. Indicating Contactor Switch (ICS) - (When
Used)
Close the main relay contacts and pass
sufficient dc current through the disc unit
contact circuit to close the contacts of the
ICS. This value of current should not be
greater than the value marked on the
nameplate. The operation indicator target
should drop freely.
The contact gap should be approximately
0.047 inches between the bridging moving
contact and the adjustable stationary con-
tacts. The bridging moving contact should
touch both stationary contacts simulta-
neously.
2. AC Contactor Switch (ACS) - (When Used)
The core screw, which is adjustable from
the top of the ACS unit, determines the
pickup value. The making of the contacts
and target indication should occur at
approximately the same instant. Position
the stationary contact for a wipe of 1/64 to
3/64 inches with the armature against the
core pin. For units with double-trip con-
tacts, the adjustment procedure is the
same as with the single trip unit.
Close the main relay contacts and pass
sufficient ac current through the trip circuit
to close the ACS contacts no later than 98
percent of the value given on the relay
nameplate. Dropout must occur at 90 per-
cent of that rating.
3. Disc Unit
a. Contacts (Mechanical) - The index
mark on the movement frame will coin-
cide with the “0” mark on t he time-dial
when the stationary contact has
moved through approximately one-half
of its normal deflection. Therefore, with
the stationary contact resting against
the backstop, the index mark is offset
to the right of the “0” mark by approxi-
mately 0.020 inches. The placement of
the various time-dial positions lined
with the index mark will give operating
times as shown on the time curve.
b. Operating Circuit - Set up the CVE-2
relay per the test diagram in figure 15.
When V2= V1= rated voltage and
their phase difference is between 18
and 22 degrees, (either leading or lag-
ging), the contacts should just close.
Another condition for the contacts to
just close is when V1= rated voltage
and V2is increased from 10 W value
to 94 ±4 volts in phase with V1.
