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CV Voltage Relay Class 1E
For double trip relays, the upper stationary contact is
adjusted such that the contact rests solidly against the
backstop. The lower stationary contact is then
adjusted such that both stationary contacts make con-
tact simultaneously with their respective moving con-
tact.
4.4. INDICATING CONTACTOR SWITCH (ICS)
There are no settings to make on the indicating con-
tactor switch (ICS) or the Trip indicator, (OI).
5.0 INSTALLATION
The relays should be mounted on switchboard pan-
els or their equivalent in a location free from dirt,
moisture, excessive vibration and heat. Mount the
relay vertically by means of the four mounting holes
on the flange for the semi-flush type FT case. The
mounting screws may be utilized for grounding the
relay. External toothed washers are provided for use
in the locations shown on the outline and drilling plan
to facilitate making a good electrical connection
between the relay case, its mounting screws and the
relay panel. Ground wires should be affixed to the
mounting screws as required for poorly grounded or
insulating panels. Other electrical connections may
be made directly to the terminals by means of screws
for steel panel mounting.
For detail information on the FT case refer to Instruc-
tion Leaflet. 41-076 for semi-flush mounting.
6.0 ADJUSTMENTS
The proper adjustments to insure correct operation of
this relay have been made at the factory. Upon
receipt of the relay, no customer adjustments, other
than those covered under "SETTINGS", should be
required.
6.1. PERFORMANCE CHECK
The following check is recommended to verify that
the relay is in the proper working order.
6.1.1. CV Unit
Contact Check – By turning the time dial, move the
moving contacts until they deflect the stationary con-
tact to a position where the stationary contact is rest-
ing against its backstop. The index mark located on
the movement frame should coincide with the "O"
mark on the time dial. For double trip relays, the fol-
low on the stationary contacts should be approxi-
mately 1/64".
For relays identified with a "T," located at lower left of
stationary contact block, the index mark on the move-
ment frame will coincide with the "O" mark on the
time dial when the stationary contact has moved
through approximately one half of its normal deflec-
tion. Therefore, with the stationary contact resting
against the backstop, the index mark is offset to the
right of the "O" mark by approximately.020." (For the
type CV-6 and CV-7 relays, the follow on the back
contact should be approximately 1/64"). The place-
ment of the various time dial positions in line with the
index mark will give operating times as shown on the
respective curves. For double trip relays, the follow
on the stationary contacts should be approximately
1/32".
Minimum Trip Voltage (See Figures 20 and 21 for
test diagrams.) – Set the time dial to position 6.
Alternately apply tap value voltage plus 3% and tap
value voltage minus 3%.
CV-4 and CV-5 Overvoltage Relays, CV-6 and CV-7
Over or Undervoltage Relays – The moving contact
should leave the backstop for the tap value voltage
plus 3% condition and should return to the backstop
for the tap value voltage minus 3% condition.
CV-1 and CV-2 Undervoltage Relays – The moving
contacts should leave the backstop for the tap value
voltage minus 3% condition and should return to the
backstop for the tap value voltage plus 3% condition.
CV-8 Overvoltage Relays – The moving contact
should leave the backstop between 8.3% and 7.7%
of continuous voltage. Note that the resistor, where
used, should be shorted when making this measure-
ment.
Where the resistor is used, the pickup setting can be
adjusted from approximately 8% to 30% of the con-
tinuous voltage rating. This setting is made by adjust-
ing the resistor. Note, however, that the CV-8 time
curves shown in Figure 11 (page 13) apply only
when the resistor is shorted out. Timing tests should
be conducted after the resistor is used to change the
pickup. This will verify proper coordination time for
the desired pickup setting.
Time Curve – Table 1 (page 7) shows the time curve
calibration points for the various types of relays. With
41-201.4H
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