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Type CP Reverse Phase Relay
A. CP UNIT
1. Contacts - Apply sufficient voltage to the relay,
to make the disc float in the center of its travel.
Move either of the adjustable contacts until it just
makes with the moving contact. If, the two con-
tacts pointers do not meet at the same point on
the scale, adjust the follow on both adjustable
contacts. The contacts should just make with the
moving contacts when the pointers meet on the
scale. Approximately the same follow should be
in each of the adjustable stationary contacts.
2. Minimum Trip Voltage - The adjustment of the
spring tension in setting the minimum trip voltage
is most conveniently made with the damping
magnet removed.
Set either of the adjustable stationary contacts in the
center of its travel. (For example, on the 120 volt
relay, set the contact on the 95 volt setting.) Apply
this voltage to the relay. Wind up the spiral spring by
means of the spring adjuster until the stationary
contact and moving contact just make.
Check the other scale markings by setting the adjust-
able contact on these markings and applying the cor-
responding voltage. The moving contact should
make and break within plus or minus 3% of the value
marked on the scale.
3. Time Curve Calibration - Install the permanent
magnet and connect the relay as per the circuit
of Fig. 8.
Set the high voltage contact on 100 volts and the low
voltage contact on 70 volts. (For the 240 volt relay,
multiply these values by two. Similarly for the 480
volt relay, multiply these values by four.) For the 208
volt relay set the high voltage contact on 170 volts
and the low voltage contact on 120 volts. Apply rated
voltage and frequency to the relay to allow the high
voltage contact to make. Suddenly drop the voltage
to zero and adjust the permanent magnet gap until
the relay operates in 3.7 ± .15 sec.
Check the closing time of the high voltage contact by
use of Fig. 9. With the voltage originally zero, sud-
denly apply rated voltage and frequency to the relay.
The high voltage contact should close in 3.9 seconds
± 0.2 sec.
B. INDICATING CONTACTOR SWITCH (ICS)
Close the main relay contacts and pass sufficient d-c
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.
7.0 RENEWAL PARTS
Repair work can be done most satisfactorily at the
factory. However, interchangeable parts can be fur-
nished to the customers who are equipped for doing
repair work. When ordering parts, always give the
complete nameplate data.
8.0 ENERGY REQUIREMENTS
The type CP relay when energized at rated fre-
quency and voltage balanced 3 phase has the follow-
ing VA burden for each phase.
Freq.
Hertz
Phase
Watts
Phase A
.25
60
Phase B
.37
1.11
Phase C
Phase A
.35
50
Phase B
.53
Phase C
1.48
The continuous voltage rating of the relays is 110%
of rated voltage.
41-222.2J
Lagging
Power
Factor
Vars
VA
Angle
2.82
2.83
85
1.92
1.96
79
2.50
2.73
66
3.37
3.39
84
2.28
2.34
77
2.79
3.16
62
7
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