ABB CM Talimat Broşürü - Sayfa 6
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1. Contacts
Stationary contacts assembly should be aligned
with respective marks located on scale plate,
prior to checking the relay. These marks indicate
approximately 1 ampere of unbalance.
2. Minimum Trip Current
NOTE: The front electromagnet energized alone
will produce a disc rotation to the left while a rear
electromagnet energized alone will produce a
disc rotation to the right.
Minimum trip can be checked by energizing
either the front or rear electromagnets alone and
noting that the moving contact makes with its
respective stationary contact at one ampere.
3. Balance Check
Apply one ampere through the front and rear
electromagnets simultaneously. The moving
contact should remain substantially midway
between the stationary contacts. A similar check
should be made utilizing six amperes.
4. Time Curve
Contact travel is from balanced position to either
the right or left stationary contacts.
6
Figure 4.
Typical Time Curve with Zero Restraint of the Type CM Relay
Electromagnets are to be energized alone (zero
restraint). Apply ten amperes and note that con-
tacts make at one second ± 10%. Time curve
characteristic per figure 5.
Figure 5. Diagram of test connection for the non-tapped
Type CM Relay in the FT-31 Case. For tapped
CM place tap screw in 1 amp. tap setting.
7.1.2.1.
Indicating Contactor switch (ICS)
Close the main relay contacts and pass sufficient dc
Sub 2
188A146
Sub 3
188A143