Closing Relay; Closing Solenoid - Westinghouse DBN-1016 Technical Manual

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bolts also free the closing solenoid of an elec-
trically operated circuit breaker which should
be temporarily replaced.
To replace the trip button spring (176), un-
hook the spring ends while working through the
opening in the bottom of the mechanism frame.
Replace in similar manner.
To replace the latch spring, remove snap
ring and push pin (182) part way through the
mechanism until latch spring (181) is free. in-
sert new or serviceable spring, making sure
that spring ends are properly located. Repo-
sition pin and snap ring. Reinstall operating
mechanism in reverse order to disassembly
procedure Make certain that the trip bar ro- .
tates freely and that the trip elements are
properly located.
5-2-1-6 Closing Relay-(See Figure 1-2-4)
Refer to Paragraph 1-2-1-6 for description
and operation of the closing relay. The required
maintenance will consist of replacing a broken
or defective spring and repairing or replacing
the contacts.
Remove the closing relay from the circuit
breaker before attempting any disassembly. To
remove the c 10 sin g relay from the circuit
breaker, remove the cover screw (239) and lift
off molded cover (211) to expose the terminal
connections. Tag, then remove the terminal
connections by loosening the terminal screws.
Remove the cover of the terminal block and
disconnect the relay coil leads. Remove two
screws (219) securing the relay in position and
remove relay from circuit breaker.
To replace a defective relay coil (206), re-
move screws (208) securing the coil frame (203)
and the coil to tbe molded base (238). Lift
frame and coil assembly off base. Remove
screw (209) and slide out bushing (207).
Remove bolt (226) to remove stationary
core (205). Slide coil sideways to remove from
frame. Replace coil and reassemble in reverse
order to disassembly procedure.
To replace latch spring (225), remove screw
(208),
securing the coil frame (203) and the
coil to the molded base (238). Lift frame and
coil assembly off base. Pull pin (227) out far
enough to allow spring (225) to drop out. Re-
place spring and re-position pin (227). Lower
movable core (204) and latch assembly into
base, making sure latch (229) slides over pin
(230). Reassemble in reverse order to disas-
sembly instructions.
CHAPTER 5-MAINTENANCE
To replace a trip spring (221), remove ring
from the end of the trip crank pin (222). Push
out trip crank pin with soft rod and lift out trip
spring. Reassemble in reverse order to dis-
assembly procedure.
To replace m
0
v i n g contact arm spring
(235),
remove arcing chamber retaining strip
(214)
and both arCing chambers (215) by
removing screw (213). Remove contact (236)
by removing screw (233). Depress movable
contact arm (234) at the upper end and hold.
Compress spring with screwdriver and remove.
Reassemble in reverse order to disassembly
procedure.
To replace blowout magnet coil (216) or
(217), remove arcing chamber retaining strip
(214) and both arCing chambers (215) by re-
moving screw (213). Remove contact (236) by
removing screw (233). Remove stationary con-
tacts (237) by removing stationary contact screw
(240). The assembly consisting of coils (216)
and (217), core (242), screw (218) and side
plates (212) can be lifted out. Remove side
plate screw (218) to detach side plates from
core and slide coil off core. Reassemble in
reverse order to disassembly procedure.
To replace stationary contact, remove arc-
ing chamber contact strip (214) and both arcing
chambers (215) by removing screw (213). Re-
move moving contact (236) by removing screw
(233).
Remove stationary contact (237) by re-
moving stationary contact screw (240). Reas-
semble in reverse order to disassembly pro-
cedure.
Afte r replacing the stationary contaet, check
the contact for proper a dj u s t men
t.
Figure
5-2-1
shows an enlarged view of the relay con-
tacts and clearly indicates the proper measure-
ments. Measure distance itA" with the contacts
open, measure the distance "B" with contacts
Closed. The difference between "A" and "B"
is distance "0". If this dimension is greater
than required, bend the longer arm slightly in
and then bend the short arm slightly forward.
Bending the arms in the opposite direction will
decrease dimension "D". Repeat this procedure
until satisfactory adjustment is obtained.
5-2-1-7 ClOSing Solenoid-(See Figure 1-2-5)
Refer to Paragraph 1-2-1-7 for description
and operation of the closing solenoid (244). The
solenoid closing coil or the relay trip spring
(254)
are the only parts which may require re-
placement.
5·3