I.L. 41-201.2G
2
TYPE CV FREQUENCY
COMPENSATED VOLTAGE RELAY
leaf-spring mounted contacts are attached, is attracted
to the magnetic core upon energization of the switch.
When the switch closes, the moving contacts bridge
two stationary contacts completing the trip circuit. Also
during the operation two fingers on the armature
deflect a spring loaded on the front of the switch which
allows the operation indicator target to drop. The tar-
get is reset from the outside of the case by a push-rod
located at the bottom of the cover.
The adjustable pickup range is accomplished by
means of an adjustable resistor.
2.3
INDICATING CONTACTOR SWITCH (ICS)
The indicating contactor switch is a small dc oper-
ated clapper type device. A magnetic armature, to
which leaf-spring mounted contacts are attached,
is attracted tot he magnetic core upon energiza-
tion of the switch. When the switch closes, com-
pleting the trip circuit. Also during this operation
two fingers on the armature deflect a spring
located on front of the switch, which allows the
operation indicator target to drop. The target is
reset from the outside of the case by a push-rod
located at the bottom of the case.
The front springs, in addition to holding the target,
provides restraint for the armature and thus con-
trols the pickup value of the switch.
3.0 CHARACTERISTICS
These relays are frequency compensated such that
their pickup between 30 and 90 hertz is within 5% of
the 60 hertz value.
The CV-21 and CV-22 undervoltage relays, CV-24
and CV-25 overvoltage relays, and CV-26 and CV-27
over or undervoltage relays are available in the volt-
age ranges shown below:
3.1
CV-21 AND CV-22 UNDERVOLTAGE
RELAYS; CV-24 AND CV-25
OVERVOLTAGE RELAYS
TAP VALUE VOLTAGE IS THE MINIMUM VOLTAGE
REQUIRED TO JUST CLOSE THE RELAY CON-
TACTS. At this value of voltage, the moving contacts
will leave the backstop of the time dial and move to
close the front contacts. Normal operation of the two
relays is such that the CV-21 and CV-22 undervoltage
relay will open its contacts with application of voltage
greater than tap value voltage, while the CV-24 and
CV-25 overvoltage relay closes its contacts with volt-
ages greater than tap value voltage.
3.2
CV-26 AND CV-27 OVER OR
UNDERVOLTAGE RELAYS
Tap value voltage is the value of voltage at which the
stationary front contact closes. The stationary back
contact will close within 5% of this value.
When the relay is used as an overvoltage relay, the
moving contact is made with the stationary back con-
tact for values of applied voltage less than tap value
voltage, the moving contact moves to close the front
contact in a time as shown by the right-hand curve of
either figure 8 or 9 (page 11) .
When the relay is used as an undervoltage relay, the
moving contact is made with the stationary front con-
tact for values of applied voltage greater than tap
value voltage. With the application of voltages less
than tap value voltage, the moving contact moves to
close the back contact in a time as shown on the
left-hand curves of either figure 8 or 9 (page 11) .
Instantaneous indicating voltage switch (IIV)
The range of operation is 120 to 200 volts ac. The
pickup is adjusted by means of an adjustable resis-
tor.
3.2.1
Trip Circuit
The main contacts will close 30 amperes at 250 volts
dc and the seal-in contacts of the indicating contactor
switch will carry this current long enough to trip a cir-
cuit breaker.
The indicating contactor switch has two taps that pro-
vide a pickup setting of 0.2 or 2 amperes. To change
taps requires connecting the lead located in front of
the tap block to the desired setting by means of a
screw connection.
Range
Tap
55 - 140
110 - 280
55, 64, 70, 82, 93, 105, 120, 140
110, 128, 140, 164, 186, 210, 240, 280
