41-222.2J
Type CP Reverse Phase Relay
4
tor switch (when supplied) will carry this current long
enough to trip a circuit breaker.
The indicating contactor switch (when supplied) has
two taps that provide 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.
TRIP CIRCUIT CONSTANT
Indicating contactor switch (ICS) (When Supplied).
0.2 ampere tap - - - - - - - 6.5 ohms d-c resistance
2.0 ampere tap - - - - - - 0.15 ohms d-c resistance
INDICATING VOLTAGE SWITCH (IVS)
(WHEN SUPPLIED)
The indicating voltage switch (IVS) has a series
resistor. The IVS will operate when 80% d-c rated
voltage is applied to the IVS circuitry.
4.0
INSTALLATION
The relays should be mounted on switchboardsepa-
rated to allow for a minimum contact gap of panels or
their equivalent in a location free from dirt, moisture,
excessive vibration and heat.
Mount the relay vertically by means of the rear
mounting stud or studs for the type FT projection
case or by means of the four mounting holes on the
flange for the semi-flush type FT case. Either the
stud or 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 or studs, and the relay panel. Ground wires
should be affixed to the mounting screws or studs 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 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 Instruc-
tion Leaflet 41-076.
5.0
SETTINGS
There are two independent relay adjustments. These
are the high and low voltage contact settings as
described under “Characteristics”. These settings
determine the balanced three phase line-to-line
voltage at which the relay contacts trip. The relay
timing is not an independent adjustment, since it is
fixed by the contact settings chosen. Typical time
curves for various contact settings are given in Figs.
6 and 7.
For motor protection set the low-voltage contact at
the minimum permissible operating voltage. (This
contact may also close when the motor is operated
single-phased, provided the open phase voltage is
not held too close to normal by the motor. A motor
operating near full load or a motor connected in par-
allel with substantial static load will not be able to
maintain near normal open-phase voltage.) Where
the high voltage contact supervises supply breaker
closing, it must be set lower than normal voltage. For
example, set the high-voltage contact at 90% and the
low-voltage contact at 80% of rated voltage. The high
and low-voltage contacts must be sufficiently sepa-
rated to allow for a minimum contact gap of about
0.020 inch. This corresponds to a voltage setting
separation of about 7%.
Fig. 5.
Internal Schematic of the Type CP Relay with Indi-
cating Contactor Switch in the High Voltage Circuit
in the Type FT-11 Case.
183A961
Sub 1
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