Westinghouse DBN-1016 Technical Manual page 46

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Westinghouse
ADDITIONAL MAINTENANCE INSTRUCTIONS
NAVY TYPE ACB 1600HR
This insert was prepared to provide
additional checking and adjustment in-
structions for coolant pump breakers
where reliable closing is extremely im-
portant.
Technical manual NavShips 362-2189
covers general maintenance, but this man-
ual was prepared to stress and add the
following:
1. Mounting hardware and locking de-
vices should be inspected and if required,
tightened at least once a year.
2. Tru-arc ring retainers have proven
reliable over many years of service. How-
ever, several precautions should be taken
when replacing a Tru-arc ring on a pin.
a. If old ring is distorted by removal,
obtain new Tru-arc ring from on-board
repair parts.
b. If groove on pin is dirty, clean with
wire brush before reassembly.
c. Install Tru-arc rings with sharp edge
facing end of pin. Note that manufacturing
dulls or rounds one edgeofringandleaves
the other edge sharp.
3. The failure of a breaker to close can
be the result of operating errors or a
variety of equipment deficiencies. The
problem of correction is usually apparent
if failure is consistent. The follOwing
list attempts to help the personnel involved
locate the trouble when the failurE'S occur
infrequently.
a. If personnel suspects that breaker
relay was not energized, that is no cliCk-
ing sound from relay, then look for:
1. Open interlock switch or exter-
nal relay not functioning.
2. Loss of control power.
b.
If
personnel suspects breaker relay
was energized, but that closing solenoid
was not energized, look for:
1. Relay deficiencies which might
prevent relay latch (229) Figure
1-2-4 from engaging pin (230). Bind-
ing of latch (229), trip crank (220).
spring (221), or pin (201) could cause
this.
2. Relay deficiencies which might
allow latch (229) to slide off pin (230).
A worn hook on latch (229) or non-
functioning spring (225) could cause
this.
3. Relay contacts not making due
to lack of adjustment per Figure
5-2-1.
c. If personnel hears breaker solenoid
move, but suspects that main·contact arms
of pole units did not move, then look for:
1. Failure of trip bar to reset, in-
sufficient latch engagement, incor-
rect trigger clearance, or faulty
latch position. See Figure 1 of this
insert for details of inspection and
correction.
2. Failure to completely place
breaker in cell, so that cell interlock
holds trip bar up.
3. Electric lockout not energized
or not functioning. Lockout should
be energized at least 1/4 second
before breaker relay.
4. Manual trip sticking and holding
trip bar up.
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