PS Magazine - FEBRUARY 1980

PS, The Preventative Maintenance Monthly

ISSUE 327

FEBRUARY 1980
PS Magazine - FEBRUARY 1980 - Page 14 of 35
1±-
,·;
.
±
.,
'±\
_² ³´µ¶¸¹
Overloadi
n
g
smaL± generator sets damagEs the uniVErsA±
voLtage regu±ator. Up to now, you mecHanics rEp±Aced And
discarded a bum reguLator-no questions asked.
Not A²ymore! T³e regulator, NSN 6110´00´764´7621, is
repairab±e by DSU.
It is used on
3´KW ModeLs
µ¶P´016·¸ ´021·,
´026·;
5´KW µode±s
µ¶¹´017 ·, ´022º;
And
10´
K
µodE±s
Voltage regulators
µ¶P´018·, ´023º.
are now Repairable
µost of 'Em can be put bAck into sErVice by rEp±Acing
a B±own powEr transistor .
.. A 1´buck itEm.
24
-²³BUT buM OPERAtor pRaC´IceS Likµ
¶·s¸ ¹º»¼½ ¾¿WÀÁ ÂÃÄNÅÆÇÈÉÊ
ËÌÍÎÏ
FÐÑlÒÓÔÕ.
»perators thrott±e back their sets and ±Et 'Em id±e At ±ess than rated ±oad or
t¼ey ±eave the circ½it breAkEr ON with ±oad conn¾cted during shutd¿wn.
À
¶itheR Áction causes t¼e voLtage and
"
frequency to drop BeLow the required
output. T¼is drop dEcreases the exciter
voLÂage causing thE voLtage regu±ator
to operate at max output. Ãesu±t:
OverLoading .
.. and b±own power tran´
is
O
(CFÄÅed) or OÆÆ (open)Ç The
rated operatiÈg speed is easiest on thE
exciter, vo±tage rEgu±ator and rotating
reÉtifiEr diodesÊ
4.2-KW GenErators
You need 2 connectors´adaptErs
ËNSN 4730Ì00´842Í2198 and Î/´in
ÆoLLow the step´byÌstep starting
and shutÏown procedures in Ðhap 3,
Tµ 5´6115´271´14 (3´KW)Ñ Tµ 5´
6115Í332´14 (5´KW); and Tµ 5Ò
6115´275´14 (10ÌKW). TheyÓ±L hE±p
unLoad the high Éost of repLacing
universal vo±tage rguLators.
One morE noteÔ The universa±
vo±tagE rEgu±ator NSN 6110´00´764´
7621 repLaces these oLder mÕdeLsÖ
6110´00´065´7505, ´066´1171, ´930´
4818 And ´930´6878. If your 3´, 5´or
10´KW set has one of these vo±tage
reguLators and it faiLs,_ rEp±ace it with
the universaL vo±tage reguLator.
×nd
if the universa± vo±tageØ
reguLator fai±s, turn it in to your ÙSU
for repairs.
15-KW
DOD
GeneraToR Fuse
ÚhosE NSN 4720´00´289´9202
to
NSN 5920´00´131Û9897 gets thE
I
\
1
ÜaBricatE t¼e fue± fi±ter to engine hose 40´amp f½se nEeded Ýr the aLternator.
;(J,±1²
assembLy NSN 4720´00Í933´7355 for ·dd t¼is NSN to page 160ofyourTµ
º
•I/
l
L
Þ
your 4.2´KW generator set.
5´6115´4ß4Ì24P (Oàt 78).
±²³/´µ,
25
»¼
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