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CONNECTIONS
The internal connection diagrams for the various relays are shown in Fig. 5 to
7. Typical wiring diagrams are shown by Fig. 8 and
panel which adequately grounds the relay case, it is recommended that the case be
grounded through a mounting stud or screw with a conductor not less than #12 B&S
gage copper wire or its equivalent.
INSPECTION
At the time of installation, the relay should be inspected for tarnished
contacts, loose screws, or other imperfections.
be corrected in the manner described in the section on
CAUTION
Every circuit in the drawout case has an auxiliary brush.
important on current circuits and other circuits with shorting bars that the
auxiliary brush be bent high enough to engage the connecting plug or test plug
before the main brushes do.
opened. Refer to Fig. 20 .
Before the relay is put into service, it should be given a check to determine
that factory adjustments have not been disturbed. The time dial will be set at zero
before the relay leaves the factory.
be necessary to change this setting in order to open the time overcurrent unit
contacts.
The following tests are suggested:
TARGET AND SEAL-IN UNIT
1 .
Make sure that the tap screw is in the desired tap.
2 .
Perform pickup and dropout tests as outlined in the ACCEPTANCE TESTS
section.
TIME OVERCURRENT UNIT
1 .
Set tap screw on desired tap.
approximately twice tap value current until the contacts just close.
Reduce the current until the light in series with the contacts begins to
flicker. This value of current should be within five percent of tap value.
2 .
Check the operating time at some multiple of tap value.
tap value may be five times tap rating or the maximum fault current for
which the relay must coordinate.
of the user.
DIRECTIONAL UNIT
1 .
If current polarized or dual polarized, connect per Fig. 22 .
2 .
Adjust the control spring for 0 . 5 ampere pickup (front contacts)
If potential polarized connect per Fig. 23.
3 .
4.
With voltage set at 5 volts at terminals
so that the unit closes its front contacts at 1 . 4 ±20% Amperes.
GEK-49849
If any trouble is found, it should
This will prevent CT secondary circuits from being
OPERATION
If the setting has not been changed, it will
Using the test circuit in Fig. 21, apply
The value used is left to the discretion
2 2
Unless mounted on a steel
9.
SERVICING.
It is especially
This multiple of
& 10, adjust the control spring
9
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