ABB CP Series Talimat Broşürü - Sayfa 7

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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

Phase B

.37

1.11

Phase C

Phase A

.35

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

Angle

2.82

2.83

1.92

1.96

2.50

2.73

3.37

3.39

2.28

2.34

2.79

3.16