CVQ Relay
41-223N
5
connections may be made directly to the terminals by
means of screws for steel panel mounting or to the
terminal stud furnished with the relay for thick panel
mounting. The terminal stud may be easily removed
or inserted by locking two nuts on the stud and then
turning the proper nut with a wrench.
For detail information on the FT case refer to I.L. 41-
076.
7.0 ADJUSTMENTS & MAINTENANCE
The proper adjustments to insure correct operation of
this relay have been made at the factory. Upon
receipt of the relay, no adjustments, other than those
covered under Section 5, “
SETTINGS
” (page 4),
should be required.
7.1
ROUTINE TESTS
The following tests are recommended when the relay
is received from the factory. If the relay does not per-
form as specified below, the relay either is not prop-
erly calibrated or it contains a defect.
Connect relay per test circuit Figure 6 (page 11).
Electrical checks should be made with the relay
mounted in its case.
7.1.1
Negative Sequence Filter
The filter is adjusted for balance in the factory and no
further adjustments or maintenances should be
required. The nominal voltage output of the filters on
positive sequence is approximately zero. This serves
as a convenient check on the balance of the filter. If
any two input leads to the potential filter should be
interchanged, a high voltage occurs across the out-
put terminals of the filter.
7.1.2
Polar Unit
Adjust variable auto-transformer (figure 6, page 11)
so that an increasing voltage can be seen on the volt-
meter. Note at what voltage the polar unit operates.
This voltage should be 10.4 volts
±
0.3 volts.
This corresponds to the 5% sensitivity adjustment.
For other sensitivities see Table 1 under calibration.
7.1.3
CV Unit
7.1.3.1
Contact
a) For relays identified with a “T”, located at lower
left of stationary contact block, the index on the
movement frame will coincide with the “0” mark
on the time dial when the stationary contact has
moved through approximately one-half of its nor-
mal deflection. Therefore, with the stationary
contact resting against the backstop, the index
mark is offset to the right of the “0” mark by
approximately .020”. (For the CV-7 element, the
follow on the back contact should be approxi-
mately 1/64”.) The placement of the various time
dial positions in line with the index mark will give
operating times as shown on the time voltage
curves of Figure 3 (page 8). For double trip
relays, the follow on the stationary contacts
should be approximately 1/32”.
(For relay without an identifying “T”)
b) By turning the time dial, move the moving con-
tacts until they deflect the stationary contact to a
position where the stationary contact is resting
against its backstop. The index mark located on
the movement frame should coincide with the “0”
mark on the time dial. For double trip relays, the
follow on the stationary contacts should be
approximately 1/64”.
7.1.3.2
Minimum Trip Voltage
Set the time dial to position #6. Alternately apply tap
value voltage plus 3% and tap value voltage minus
3%. The moving contact should leave the backstop
at tap value voltage plus 3% and should return to the
backstop at tap value voltage minus 3%.
7.1.3.3
Time Curve
Set time dial at #6 dial position. Energize terminals 7
and 8 of relay with 140% of tap value voltage. The
operating time of relay should be 5.9 seconds. The
reset time of relay should be 5.7 seconds.
7.1.4
Indicating Contactor Switch (ICS)
Close the main relay contacts and pass sufficient dc
current through the trip circuit to close the contacts of
the ICS. This value of current should not be greater
than the particular ICS setting being used. The indi-
cator target should drop freely.
The bridging moving contact should touch both sta-
tionary contacts simultaneously.
