Westinghouse De-ion DB-15, Инструкция по эксплуатации

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PART THREE
MAINTENANCE
POLE UNIT
Each pole unit is mounted on a separate molded
base through which the breaker studs pass. (See
Fig. 5). The molded bases are attached to the steel
mounting panel and provide insulation for the break­
er studs.
The upper stud and contact are attached to the
molded base by one bolt. The moving contact is
pivoted on the molded base and attached to the
cross bar through insulating links. The series coil
_
a!J.d lower stud are fastened to the molded base by
three bolts.
Contacts.
(See Fig. 5). The DB-25 arcing con­
tacts
should touch first on closing, open last on
opening, and have approximately a %2-inch gap
when the breaker is completely closed. This gap
is adjusted by removing the cross bar and screwing
the insulating
link
in or out on the stud. Be sure to
tighten the lock nuts after each adjustment.
The DB-15 contacts are adjusted to obtain %2 to
lfs
inch gap between the armature plate and the
steel link. As the contacts burn away it will be
necessary to adjust as described above for the DB-25.
Do not over-adjust as this will cause the opening
spring to compress to the solid position and thus
increase the closing effort. Check for over-adjust­
ment by manually pulling the moving contact away
from the stationary contact, with the breaker in the
closed position. It should be possible to obtain at
least 'Awinch gap between contacts.
Maintenance of Contacts.
Rough or high
spots should be removed with a file or sandpaper.
To replace the arcing contacts, open the breaker,
remove the arc chutes and then the stationary arc­
ing contacts. Close the breaker and remove the
moving arcing contacts. The new contacts can then
be added in the reverse order.
Caution:
All power should be removed when
changing, maintaining or adjusting contacts .
Table No. Z. CLOSING SOLENOID CONTROL VOLTAGES, TRIPPING CURRENTS,
CLOSING CURRENTS AND FUSE RATINGS
BREAKER
CLOSING NOMINAL
COIL
CONTROL
TYPE
BURDEN VOLTAGE
12D-C
125 D-C
250 D-C
DB-15 All 230 A-C
460 A-C
575 A-C
24D-C
125 D-C
250 D-C
Std.
230 A-C
460 A-C
5?J
575 A-C
DB-25
48D-C
125 D-C
250 D-C
H
i
g
h
230 A-C
460 A-C
575 A-C
CLOSING
AMPERES
.
. .
17.5
8.5
30
15
12
. .
23
10
35
15
12
.
.
34
15
49
24
20
•
NOTE: For A-C closing use 3-kva source or larger.
TRIPPING
AMPERES
18
2
1
.5
.2
.3
9.5
2
1
.5
.2
.3
5
2
1
.5
.2
.3
RECOMMENDED
FUSE RATING AMPERE
Standard N EC
.
.
10
6
.
.
. .
.
.
.
.
10
6
.
.
' .
. '
.
.
20
6
.
.
. .
.
.
Time Lag
. .
.
. . .
.
.
.
2.5
2.0
1.6
.
.
.
. .
.
.
. .
8
2
1.6
.
.
.
. . .
. .
.
8
2.25
2.25
0 Standard close coils used when overcurrent tripping devices have instantaneous trip.
Special close coils used when overcurrent tripping devices have short delay feature.
12
FUSE
STYLE NUMBER
• 0 . o o • • o o • • 0
120A823H04
120A823H03
120A864G17
120A865G15
120A865G13
• • • 0 • • • • • • • •
120A823H04
120A823H03
120A864G27
120A865G15
120A865G13
• • • 0 0 • • • • • 0 .
120A823G06
120A823H03
120A864G27
120A865G16
120A865Gl6
'
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